Best Fuel Pump Options for TBI 350 Engines

When it comes to keeping your classic TBI 350 engine running strong, few components are as critical as the fuel pump. I’ve been there, staring at a sputtering engine, trying to diagnose the issue, and more often than not, a failing fuel pump is the culprit. Choosing the best fuel pump options for your TBI 350 engine isn’t just about grabbing any old pump; it’s about matching the right flow, pressure, and durability to ensure your ride gets the consistent, clean fuel it needs. Whether you’re doing a simple replacement, tackling an engine swap, or looking for a performance upgrade, having a reliable fuel pump is non-negotiable for smooth operation and preventing those frustrating roadside breakdowns. In this guide, we’ll dive deep into 10 different fuel pump options, comparing their features, pros, and cons, to help you make an informed decision and keep your TBI 350 purring like it should.

IMAGE	PRODUCT NAME	AMAZON LINK
	Yezoauto High Performance Racing Electric Fuel Pump with…	View on Amazon
	OXCANO M6624 Mechanical Fuel Pump Fuel System Automotive…	View on Amazon
	Fuel Pump Compatible with Kohler 17HP-25 HP Briggs and…	View on Amazon
	A-Premium Mechanical Fuel Pump with Gasket Compatible with…	View on Amazon
	HIPA 24 393 04-S 24 393 16-S Fuel Pump Compatible…	View on Amazon
	AZHZ Fuel Pump Assembly w/Sending Unit for 12V Gas TBI…	View on Amazon
	Caltric Fuel Pump Compatible with Honda Trx350 Trx-350 Trx…	View on Amazon
	EVERESTWAY 340LPH High Pressure High Flow In-Tank Fuel Pump…	View on Amazon
	A-Premium 255LPH Electric Fuel Pump In Tank Compatible with…	View on Amazon
	12V Fuel Pump Replaces For Honda Trx350 Trx-350 Trx 350…	View on Amazon

Product Reviews

1. Yezoauto High Performance Racing Electric Fuel Pump

This Yezoauto electric fuel pump positions itself as a high-performance option, often found in various conversion and upgrade scenarios. While its broad compatibility with GM Truck Carb or TBI to LM7/LQ4/LQ9 5.3/6.0 engines suggests versatility, its high flow rate means it’s often considered for more than just a stock TBI 350. It’s a solid choice if you’re looking for a robust pump for a modified TBI setup or an engine swap, especially where higher fuel demands are present. The comprehensive kit aims to provide most of what you’d need for a fresh installation.

Key Features:
– High performance electric fuel pump suitable for various GM applications and conversions.
– Includes a complete installation kit: fuel strainer, universal connector, hose, clamps, foam sleeve, and rubber grommet.
– Offers broad interchange compatibility with numerous OEM and aftermarket part numbers (e.g., F20000169, HFP-343, Delphi FE0113).
– Durable construction with 100% new materials, meeting or exceeding OE standards.
– Backed by a 3-year warranty.

Pros:
– High flow capacity, suitable for performance upgrades or engine swaps.
– Comes with a comprehensive installation kit, saving time on parts sourcing.
– Strong warranty offering peace of mind.
– Broad cross-referencing for compatibility checks.

Cons:
– May be overkill for a stock TBI 350, potentially requiring a fuel pressure regulator if not already present.
– “Racing” in the name might suggest it’s more aggressive than needed for a daily driver.
– Installation might require some adaptation for specific TBI 350 setups, despite the “universal” nature.

Best for: TBI 350 owners looking for a performance upgrade, those doing engine swaps (like LS conversions), or anyone needing a high-flow electric pump for a modified TBI system.

User feedback summary: Owners appreciate the pump’s strong flow and the complete kit it comes with. Many have used it successfully in modified setups or conversions, noting its reliability for the price. Some mention needing to verify their existing wiring and fuel lines for proper compatibility, especially due to its higher flow.

2. OXCANO M6624 Mechanical Fuel Pump

The OXCANO M6624 is a mechanical fuel pump, designed for a wide array of older carbureted GM vehicles from the 1970s and 80s. It prides itself on durability and efficiency, using high-efficiency turbine technology for quieter operation and improved engine performance. Installation is straightforward for those familiar with mechanical pumps. However, it’s crucial to understand that this is a mechanical pump, and TBI 350 engines require an electric fuel pump to deliver the higher and more consistent fuel pressure needed for fuel injection.

Key Features:
– Mechanical fuel pump designed for robustness and long life.
– Provides high-efficiency pumping with less energy use, thanks to turbine technology.
– Engineered with precision castings and rockers for durability.
– Easy to install for compatible vehicles, with installation notes emphasizing professional recommendation.
– Extensive OEM interchange numbers (M6624, 6440987, etc.) for wide application.

Pros:
– Robust construction and designed for longevity.
– Quiet operation compared to some mechanical pumps.
– Good compatibility for older, carbureted GM applications.
– Straightforward replacement for original mechanical pumps.

Cons:
– Not suitable for TBI 350 engines, as TBI systems require electric fuel pumps.
– Delivers significantly lower pressure than required for fuel injection.
– Compatibility is limited to specific carbureted vehicles.

Best for: Owners of vintage carbureted GM vehicles like classic Chevrolets and Buicks from the 1970s and early 80s, looking for a direct replacement mechanical fuel pump. Not suitable for TBI 350 engines.

User feedback summary: Users typically find this pump to be a reliable and affordable replacement for their older carbureted vehicles, praising its easy installation and effective fuel delivery for its intended purpose. The quiet operation is often noted as a plus.

3. Fuel Pump Compatible with Kohler 17HP-25 HP Briggs and Stratton Kawasaki Honda Yamaha

This fuel pump is explicitly designed for a variety of small engines, including those found in lawn mowers, tractors, and other outdoor power equipment from brands like Kohler, Briggs & Stratton, Kawasaki, and Honda. It’s a vacuum-style fuel pump, meaning it operates differently from the electric pumps required by automotive fuel injection systems. This unit includes a fuel filter, making it a convenient replacement for its intended applications. It is not designed for automotive use and will not work with a TBI 350 engine.

Key Features:
– Vacuum-style fuel pump with an included fuel filter.
– Broad compatibility with 17HP-25 HP engines from Kohler, Briggs & Stratton, Kawasaki, and Honda.
– Designed for small engine applications like lawn mowers, tractors, and golf carts.
– Replaces multiple OEM part numbers (e.g., 491922, 691034).
– Fits 1/4-inch fuel lines.

Pros:
– Affordable and readily available for small engine repairs.
– Comes with a fuel filter, simplifying replacement.
– Good compatibility for its intended range of small engines.

Cons:
– Completely unsuitable for TBI 350 automotive engines due to different operating principles (vacuum vs. electric) and pressure requirements.
– Flow and pressure are far too low for fuel injection.
– Requires careful part number matching for specific small engine models.

Best for: Owners of lawn mowers, garden tractors, and other small engine equipment that require a vacuum-operated fuel pump. Absolutely not for TBI 350 engines.

User feedback summary: Customers find this pump to be a cost-effective and functional replacement for their small engine equipment, often restoring proper fuel delivery to their mowers and tractors. Many highlight the importance of cross-referencing part numbers to ensure a correct fit.

4. A-Premium Mechanical Fuel Pump with Gasket

Similar to the OXCANO, the A-Premium mechanical fuel pump is engineered for a comprehensive list of older, carbureted Chevrolet, GMC, Buick, Pontiac, and Oldsmobile vehicles. It comes with a gasket, simplifying the installation process for its intended applications. This pump aims to provide an OE-equivalent replacement for vehicles that originally came with a mechanical fuel delivery system. As with all mechanical pumps, it cannot be used in a TBI 350 engine which relies on an electric pump for precise, high-pressure fuel delivery.

Key Features:
– Mechanical fuel pump compatible with a vast array of 1960s-1980s GM carbureted vehicles.
– Includes a gasket for a complete and leak-free installation.
– Offers extensive reference numbers for broad interchangeability.
– Backed by a one-year unlimited-mileage guarantee, emphasizing quality and reliability.
– Designed for OE-equivalent fit and performance for original mechanical systems.

Pros:
– High-quality replacement for older carbureted vehicles.
– Comes with a gasket, ready for installation.
– Good warranty for peace of mind.
– Wide compatibility list for its intended applications.

Cons:
– Not compatible with TBI 350 engines due to fundamental differences in fuel system design (mechanical vs. electric).
– Provides insufficient pressure and flow for fuel injection.
– Requires proper vehicle fitment verification.

Best for: Restoring classic carbureted GM cars and trucks from the late 60s through the 80s that originally used a mechanical fuel pump. Not a suitable option for TBI 350 engines.

User feedback summary: Users praise this A-Premium pump for its direct fit and performance as a replacement for their vintage vehicles’ mechanical pumps. The included gasket is often mentioned as a helpful addition, ensuring a smooth installation. Many appreciate the reliability for the price point.

5. HIPA 24 393 04-S 24 393 16-S Fuel Pump Compatible with Kohler Small Engines

This HIPA fuel pump is another product specifically designed for small engines, focusing on Kohler Command and Courage series, as well as some Honda and Briggs & Stratton models. It’s a vacuum/pulse style fuel pump, which means it uses pressure differentials from the engine to operate a diaphragm and pump fuel. Its typical application is for engines up to 25 horsepower, a clear indicator that it’s not for automotive use. This pump is entirely incompatible with the electric fuel injection system of a TBI 350 engine.

Key Features:
– Vacuum/pulse fuel pump for small engine applications.
– Extensive compatibility with Kohler CH/CV/SV series engines, Honda generators, and others.
– Functions by using an engine-supplied pressure differential on a flexible diaphragm.
– Designed for engines up to 25 horsepower.
– Gasoline fuel compatibility with optional ethanol resistance.

Pros:
– Effective and reliable for its intended small engine applications.
– Good compatibility for a wide range of Kohler and other brand engines.
– Affordable replacement option.

Cons:
– Not suitable for TBI 350 automotive engines; provides vastly insufficient pressure and is the wrong operating type.
– Specific part number matching is crucial for correct small engine fitment.
– No relevance to fuel-injected systems.

Best for: Repairing or maintaining Kohler, Honda, and other small engines found in lawn and garden equipment, generators, etc. Do not use for a TBI 350 engine.

User feedback summary: Customers report that this HIPA pump is an excellent, budget-friendly replacement for various small engines, effectively resolving fuel delivery issues and getting their equipment running smoothly again. The compatibility list is helpful, but users stress checking their specific engine model.

6. AZHZ Fuel Pump Assembly w/Sending Unit for 12V Gas TBI & Diesel Engines

Finally, a pump that clearly states its intended purpose for TBI applications! The AZHZ Fuel Pump Assembly is designed as a direct replacement for 12V Gas TBI and even Diesel engines, offering the correct pressure and flow for these systems. This unit is an electric pump, delivering 10-14 PSI and 35 GPH, which is right in the sweet spot for a stock TBI 350 engine. It also claims to reduce mechanical noise and optimize flow for energy efficiency, making it a strong contender for a reliable TBI fuel system. The inclusion of a sending unit suggests it’s likely a modular in-tank unit designed to replace the entire assembly.

Key Features:
– Electric fuel pump assembly with sending unit for 12V Gas TBI & Diesel Engines.
– Provides appropriate pressure (10-14 PSI) and flow (35 GPH) for TBI systems.
– Designed to reduce mechanical noise and optimize liquid power balance.
– Aims for energy efficiency by controlling fuel supply and reducing waste.
– Features quick connect outlet type and strainer inlet for ease of installation.
– Comes with a one-year warranty.

Pros:
– Specifically designed for TBI applications, making it an excellent choice for a TBI 350.
– Correct pressure and flow rate for stock TBI systems.
– Integrated sending unit can simplify installation if replacing a complete module.
– Focus on quiet operation and energy efficiency.
– Direct replacement for E8153, a common TBI pump.

Cons:
– May not be suitable for high-performance or heavily modified TBI 350s that require higher flow.
– Installation could still be complex for those unfamiliar with dropping a fuel tank.
– Specific vehicle fitment beyond “TBI” needs to be verified for the sending unit portion.

Best for: Stock or lightly modified TBI 350 engines requiring a reliable, OE-spec electric fuel pump, especially if you need to replace the entire in-tank assembly including the sending unit.

User feedback summary: Users generally find this pump to be a solid performer for their TBI trucks and SUVs, noting that it provides the correct pressure and resolves common fuel delivery issues. Many appreciate the quiet operation and the convenience of having the sending unit included.

7. Caltric Fuel Pump Compatible with Honda Trx350

The Caltric Fuel Pump is explicitly listed for specific Honda TRX350 ATV models from 1986-1989. This is a low-pressure electric pump designed for the carbureted system of these all-terrain vehicles. Its dimensions and part numbers confirm its application for ATVs. This pump is not suitable for a TBI 350 automotive engine due to fundamental differences in pressure requirements, flow rate, and intended installation.

Key Features:
– Electric fuel pump designed for Honda TRX350 ATVs.
– Replaces specific Honda part numbers (16710-HA7-672, 16710-HA7-671).
– Compact dimensions, ideal for ATV applications.
– Order includes one fuel pump.

Pros:
– Direct fit and replacement for compatible Honda ATVs.
– Reliable performance for its intended low-pressure application.
– Affordable.

Cons:
– Completely incompatible with TBI 350 automotive engines; insufficient pressure and flow.
– Designed for carbureted ATV systems, not fuel injection.
– No relevance to automotive applications.

Best for: Owners of Honda TRX350 Fourtrax Foreman ATVs (1986-1989) in need of a direct replacement fuel pump. Absolutely not for TBI 350 engines.

User feedback summary: ATV owners report that this Caltric pump is a reliable and cost-effective solution for getting their Honda TRX350s back on the trails, confirming it’s a direct fit and restores proper fuel supply to the carburetor.

8. EVERESTWAY 340LPH High Pressure High Flow In-Tank Fuel Pump

The EVERESTWAY 340LPH pump is a serious performer, designed for high-pressure, high-flow applications. Its compatibility with TBI LT1, LT4, and LS1 engines immediately signals its focus on performance, often in modified or swapped setups. With a flow rate of 340 liters per hour (LPH) at 40 PSI, it far exceeds the requirements of a stock TBI 350 (which typically needs around 10-13 PSI and 30-40 GPH). While a stock TBI 350 wouldn’t need this much flow, it could be a strong option for a heavily modified TBI 350 with increased horsepower, or for TBI-to-EFI conversions that demand higher pressure and flow. You would definitely need a good fuel pressure regulator with this.

Key Features:
– High pressure, high flow (340 LPH) in-tank electric fuel pump.
– Compatible with performance engines like TBI, LT1, LT4, LS1.
– Technical data confirms robust performance: Min 6V/Max 18V input, 0-100 PSI PRV activation.
– Engineered to OE standards for longevity and durability.
– Includes a comprehensive package: clamps, isolator, O-ring, hose, connector, and two fuel filters.

Pros:
– Exceptional flow rate for high-performance TBI 350s or EFI conversions.
– Durable construction meeting OE standards.
– Comes with all necessary installation accessories, including two fuel filters.
– Suitable for forced induction or heavily modified engines.

Cons:
– Significant overkill for a stock TBI 350, requiring an external fuel pressure regulator to maintain the correct, much lower TBI pressure.
– Might be noisier than lower-flow pumps.
– Installation of an in-tank pump can be complex.

Best for: Heavily modified TBI 350 engines, TBI-to-EFI conversions, or forced induction setups that demand very high fuel flow and pressure. Requires a good fuel pressure regulator.

User feedback summary: Performance enthusiasts laud this pump for its strong, consistent fuel delivery in high-horsepower applications. They often mention its reliability under demanding conditions but emphasize the necessity of a proper fuel pressure regulator for non-EFI or less modified setups.

9. A-Premium 255LPH Electric Fuel Pump In Tank Compatible with Chevrolet Astro & Other GM Vehicles

This A-Premium 255LPH electric fuel pump is another high-flow, in-tank option, though a step down in flow from the Everestway 340LPH. Its extensive compatibility list includes many GM vehicles that utilized TBI and early EFI systems (like the Astro, Camaro, S10, Yukon). A 255LPH pump is still considerably more flow than a stock TBI 350 needs, but it’s a popular upgrade for those looking for a buffer or planning future modifications. Like other high-flow pumps, it would require an appropriate fuel pressure regulator to bring the pressure down to the 9-13 PSI required by TBI.

Key Features:
– High flow (255 LPH) in-tank electric fuel pump.
– Broad vehicle fitment for many 1980s-1990s GM vehicles (Chevrolet, GMC, Buick, Cadillac, Pontiac).
– Includes a complete installation kit: fuel strainer, connector, sleeve, O-ring, hose, and clamps.
– Backed by a one-year unlimited-mileage guarantee.
– Excellent for upgraded fuel systems where higher flow is desired.

Pros:
– Reliable and consistent fuel delivery for various GM applications.
– Generous 255 LPH flow provides ample overhead for mild to moderate modifications.
– Comprehensive installation kit included.
– Strong warranty.

Cons:
– Overkill for a stock TBI 350, necessitating a good fuel pressure regulator.
– In-tank installation can be time-consuming.
– The higher flow might introduce more noise than an OE-spec TBI pump.

Best for: Mildly to moderately modified TBI 350 engines or those planning future upgrades that will demand higher fuel flow. Also a good option for TBI-to-EFI conversions. Requires a fuel pressure regulator for TBI use.

User feedback summary: Many users successfully install this pump in a variety of GM vehicles, often as an upgrade to their existing fuel system. They commend its reliable performance and higher flow, noting that it’s a solid choice for cars with engine swaps or mild performance enhancements. Verification of specific vehicle fitment is always recommended.

10. 12V Fuel Pump Replaces For Honda Trx350

This 12V fuel pump is another direct replacement for Honda TRX350 ATVs, much like the Caltric option. It specifies very low pressure (2-4 PSI) and a modest flow rate (50-60 L/H), which are characteristic of fuel pumps for carbureted small engines or ATVs. The description highlights its durability and direct replacement design for the original equipment. Similar to other small engine/ATV pumps, this unit is entirely unsuitable for a TBI 350 engine due to vastly different pressure requirements and system architecture.

Key Features:
– Low pressure (2-4 PSI) 12V electric fuel pump.
– Modest flow rate (50-60 L/H).
– Direct replacement for Honda TRX350 Fourtrax 4×4 (1986-1987).
– Designed for durability and long-term reliability.
– Ensures strong suction for reliable fuel supply.

Pros:
– Effective and reliable replacement for compatible Honda ATVs.
– Built to withstand daily use in ATV environments.
– Affordable and easy to install for its intended application.

Cons:
– Completely incompatible with TBI 350 automotive engines; provides far too little pressure and flow.
– Designed for carbureted systems, not fuel injection.
– No practical application for automotive TBI.

Best for: Owners of Honda TRX350 Fourtrax ATVs from 1986-1987 who need a direct, low-pressure fuel pump replacement. Do not consider this for a TBI 350 engine.

User feedback summary: ATV owners find this pump to be a functional and budget-friendly option for replacing their original Honda TRX350 fuel pumps, consistently noting that it restores proper operation to their carbureted engines.

Comparison Insights for TBI 350 Engines

Navigating these options for your TBI 350 engine requires a clear understanding of what a TBI system needs. A stock TBI 350 typically requires an electric fuel pump that delivers fuel at a consistent 9-13 PSI and a flow rate of about 30-40 Gallons Per Hour (GPH). Anything significantly outside this range will cause performance issues, from lean conditions to flooding.

Direct TBI 350 Replacements:
For a straightforward, stock TBI 350 setup, the AZHZ Fuel Pump Assembly (Product 6) stands out as the most suitable option. It’s explicitly designed for 12V Gas TBI engines, providing the correct pressure and flow (10-14 PSI, 35 GPH). The fact that it’s an assembly with a sending unit can also simplify a full replacement. This pump offers OEM-like performance and reliability without overcomplicating your system.

Performance Upgrades / Modified TBI / EFI Swaps:
If you have a modified TBI 350 that’s making more power, or if you’re planning a TBI-to-EFI conversion (like LS swaps), you’ll need higher flow.
* The A-Premium 255LPH Electric Fuel Pump (Product 9) offers a substantial flow increase, providing ample headroom for many performance builds. While still high for a stock TBI, it’s a popular choice for those looking for an upgrade path.
* The Yezoauto High Performance Racing Electric Fuel Pump (Product 1) also falls into this category, offering strong flow and a comprehensive kit. It’s a versatile choice for conversions.
* The EVERESTWAY 340LPH High Pressure High Flow In-Tank Fuel Pump (Product 8) is the highest flow option reviewed. This is for seriously power-hungry TBI 350s or demanding EFI conversions. With any of these high-flow pumps, a quality adjustable fuel pressure regulator is absolutely essential to correctly manage the pressure for your TBI unit. Without it, you’ll likely overpressurize the injectors and cause problems.

Pumps to Avoid for TBI 350 (and why):
* Mechanical Fuel Pumps (OXCANO M6624 (Product 2) and A-Premium Mechanical Fuel Pump (Product 4)): These are for carbureted engines only. TBI systems require an electric pump to maintain the higher, consistent pressure needed for injectors. Do NOT use these for a TBI 350.
* Small Engine / ATV Fuel Pumps (Kohler/Briggs/Kawasaki (Product 3), HIPA Kohler Small Engine (Product 5), Caltric Honda Trx350 (Product 7), 12V Honda Trx350 (Product 10)): These pumps are designed for very low-pressure (typically 2-7 PSI) carbureted systems on small engines or ATVs. They are grossly inadequate for the pressure and flow requirements of a TBI 350 and will not work.

In summary, when choosing for your TBI 350, always prioritize an electric fuel pump that provides the correct pressure (9-13 PSI) and sufficient flow (30-40 GPH for stock, more for modified). Be wary of pumps designed for other applications, as they will lead to frustration and poor performance.

Final Verdict

Alright, let’s wrap this up. When it comes to finding the best fuel pump options for your TBI 350 engine, the key takeaway is that compatibility isn’t just a suggestion—it’s a requirement. Many pumps on the market simply aren’t designed for the specific needs of a TBI system.

For most TBI 350 owners looking for a reliable, direct replacement that provides OEM-like performance without breaking the bank, the AZHZ Fuel Pump Assembly w/Sending Unit (Product 6) is your standout choice. It delivers the precise pressure and flow a stock TBI 350 needs, often with the added benefit of a new sending unit. It’s truly a “set it and forget it” option for those not chasing huge horsepower gains.

If you’ve got a modified TBI 350, perhaps with some mild engine work or you’re planning future upgrades (like a performance camshaft or headers), then the A-Premium 255LPH Electric Fuel Pump (Product 9) offers excellent value. It provides more than enough fuel flow overhead, but remember, you must pair it with an adjustable fuel pressure regulator to dial down the pressure to the TBI unit’s sweet spot. The Yezoauto High Performance Racing Electric Fuel Pump (Product 1) also fits this bill, especially if you appreciate a comprehensive kit.

And for the serious builders or those doing full EFI conversions from TBI, the EVERESTWAY 340LPH High Pressure High Flow In-Tank Fuel Pump (Product 8) is the powerhouse you’re looking for. Again, a robust fuel pressure regulator is non-negotiable with this kind of flow.

Let’s be crystal clear: do not even consider mechanical fuel pumps (Products 2 & 4) or small engine/ATV pumps (Products 3, 5, 7, & 10) for your TBI 350. They simply do not meet the pressure and flow demands of a fuel-injected system.

Ultimately, your best fuel pump choice hinges on your engine’s current state and your future performance goals. Do your homework, double-check your existing setup, and invest in a pump that genuinely matches the needs of your TBI 350. Happy motoring!

Comprehensive FAQ Section

Q1: What is the ideal fuel pressure for a stock TBI 350 engine?
A: A stock TBI 350 engine typically requires a consistent fuel pressure between 9-13 PSI (Pounds Per Square Inch). Maintaining this range is crucial for proper fuel atomization and engine performance.

Q2: Can I use a mechanical fuel pump on my TBI 350 engine?
A: No, absolutely not. TBI (Throttle Body Injection) systems require a higher, more consistent fuel pressure than mechanical pumps can provide. Mechanical pumps are designed for older carbureted engines, which operate at much lower pressures. Using one on your TBI 350 engine will lead to severe fuel delivery issues and prevent your engine from running correctly.

Q3: What’s the difference between an in-tank and an external fuel pump for a TBI 350?
A: In-tank fuel pumps are submerged in the fuel tank. They are generally quieter, cooler (due to fuel immersion), and often last longer. They are the OEM design for most TBI 350 vehicles. External fuel pumps are mounted outside the fuel tank along the frame rail. While easier to access for replacement, they can be noisier, run hotter, and are more susceptible to debris. For a TBI 350, an in-tank pump is generally recommended as it aligns with the original engineering and provides better longevity.

Q4: Do I need a fuel pressure regulator if I install a high-flow fuel pump on my TBI 350?
A: Yes, absolutely. If you install a high-flow fuel pump (like a 255 LPH or 340 LPH pump) on a TBI 350, you must use an adjustable fuel pressure regulator. These high-flow pumps deliver pressure far exceeding the 9-13 PSI required by TBI injectors. Without a regulator, you’ll overpressurize the system, leading to rich running conditions, poor performance, and potential damage.

Q5: How can I tell if my TBI 350 fuel pump is failing?
A: Common symptoms of a failing TBI 350 fuel pump include:
* Difficulty starting (especially when warm).
* Engine sputtering, hesitation, or stalling under load or at high speeds.
* Reduced fuel economy.
* Whining noise coming from the fuel tank area (though not all failing pumps make noise).
* Loss of power.
The best way to diagnose a failing pump is to test your fuel pressure with a gauge.

Q6: What fuel line size is typically used for a TBI 350, and does it matter for fuel pump selection?
A: Stock TBI 350 engines typically use 3/8-inch fuel supply lines and 5/16-inch return lines. For a direct replacement fuel pump, you’ll want one with connections compatible with these sizes (or an adapter kit). If you’re upgrading to a high-flow pump for a performance TBI 350, ensure your fuel lines are adequate to prevent restrictions, sometimes requiring larger lines for very high horsepower applications. Always double-check your specific vehicle’s requirements.