1989 Turbo Trans Am Fuel Pump Kit RXP255: The Complete Upgrade Guide

Bottom line: If you own a 1989 Turbo Trans Am, upgrading to the Racetronix RFPK-011 fuel pump kit featuring the RXP255 pump is the single most important reliability and performance upgrade you can make. This kit delivers 255 liters per hour of fuel flow, directly replaces the stock pump, and includes a complete plug-and-play wiring harness that solves the factory voltage drop issues that plague these cars. Without this upgrade, your factory fuel system simply cannot keep up with a modified engine, and even a stock engine benefits from the improved reliability of a modern turbine pump .

Why the 1989 Turbo Trans Am Needs a Fuel Pump Upgrade

The 1989 Turbo Trans Am is a rare and powerful car, but its factory fuel pump was designed for the stock output levels of the late 1980s. Over three decades later, the original pump is likely worn out, and the factory wiring harness was never designed to handle the current draw of a modern high-performance pump. The factory wiring was marginal even for the stock pump, and the voltage drop in the factory harness can cause a 25% or more reduction in fuel pump volume . This means your engine may not be getting the fuel it needs, especially under heavy throttle or high boost conditions.

The Racetronix RXP255 pump is the solution. It uses modern turbine technology, which provides three key benefits over the old factory pump:

1. Reduced noise – The turbine design runs quieter than the older vane-style pumps.
2. Improved reliability – Turbine pumps are more tolerant of debris and fuel contaminants.
3. Enhanced ethanol compatibility – The RXP255 is designed to work with ethanol-enhanced fuels, which is critical as many modern pump fuels contain up to 10% or 15% ethanol .

What’s Included in the RFPK-011 Kit

The Racetronix RFPK-011 kit is a complete, all-in-one solution. You don’t need to buy additional parts or adapters. Here is exactly what comes in the box:

• Racetronix RXP255 255LPH turbine fuel pump – This is the heart of the kit. It flows 255 liters per hour at 43.5 PSI and 13.5 volts, which is sufficient to support approximately 550 rear-wheel horsepower when used with the factory fuel lines and regulator .
• In-line Teflon adapter harness – This is E85 compatible and replaces the factory wiring inside the tank. It uses Teflon-insulated wire, which is highly resistant to fuel degradation.
• 30-micron filter sock – This high-flow filter protects the pump from debris while minimizing flow restriction.
• High-pressure fuel line – A non-kinking, high-pressure line that connects the pump to the factory hanger.
• Stainless steel gear clamps – These provide a secure, corrosion-resistant connection.
• Pump mount grommet and sound insulation sleeve – These help reduce pump noise and vibration inside the tank.
• OE-style molded tank gasket – This ensures a proper seal when reinstalling the fuel pump module .

The Wiring Harness: Why It’s the Most Important Part

Many people overlook the wiring when upgrading a fuel pump, but this is the single most common point of failure. The factory wiring on the 1989 Turbo Trans Am uses thin gauge wire that runs through multiple connectors and relays, causing significant voltage drop. The Racetronix upgrade harness solves this problem completely.

Here is how the Racetronix harness works:

1. Direct alternator power – The harness gets its power directly from the back of the alternator, where voltage is typically 1-2 volts higher than at the battery. This provides the pump with the full 13.5 to 14 volts it needs to perform at its peak .
2. Heavy 10-gauge wire – The factory wire is much thinner. The Racetronix harness uses 10-gauge automotive-grade copper wire, which dramatically reduces resistive power loss. This alone can improve pump performance by 10-20% compared to running the pump through the factory wiring .
3. Weatherproof connectors – The harness uses factory-style weatherproof connectors that plug directly into the fuel pump module. No cutting, splicing, or soldering is required. It is truly plug-and-play .
4. Redundant grounding – The harness includes a body ground upgrade that improves the pump’s ground supply. This is critical because a poor ground can reduce pump performance just as much as a poor power supply .

The result is a fuel pump that actually delivers its rated flow. Without this harness, even a high-performance pump can be starved for voltage, running at 12 volts or less and delivering only 70-80% of its potential flow.

What Horsepower Can This Kit Support?

The Racetronix RFPK-011 kit is designed for factory horsepower upgrades up to approximately 600 flywheel horsepower when using the factory fuel lines and fuel pressure regulator . This is a realistic, conservative estimate that accounts for the safety margin you should always build into your fuel system.

Important considerations for horsepower:

• For naturally aspirated engines – The kit supports more power because you don’t need the extra fuel volume required by forced induction.
• For forced induction engines – Boosted engines require richer air/fuel mixtures, which means more fuel volume. You should factor in a 20-25% safety margin between what your engine needs and what your fuel system can supply .
• For high-horsepower builds – If you are planning to exceed 600 horsepower, you may need to upgrade the fuel lines and fuel pressure regulator to support the additional flow.

Installation Tips for the 1989 Turbo Trans Am

Installing the RFPK-011 kit is a straightforward DIY job for anyone with basic mechanical skills. However, there are a few things to watch out for on these cars.

Check the hanger condition – The factory hanger in these cars is a Delphi unit, part number 25027221 or FL0115 . Over time, the wiring on the hanger can become corroded or brittle. If the hanger wiring is in poor condition, you should replace the bulkhead connector with a Racetronix BCWA-FL98HD wiring assembly before installing the new pump. Many owners find that the factory hanger wiring is not compatible with the new in-tank harness because GM used random inventory or the hanger has been replaced over the years .

Replace the tank gasket – The kit includes a new OE-style molded tank gasket. Always replace this gasket when you open the tank. The old gasket will be brittle and may leak.

Prime the pump before starting – After installation, turn the key to the "ON" position for a few seconds to allow the pump to prime the system. Do this two or three times before cranking the engine. This prevents the pump from running dry and ensures the fuel system is pressurized.

Test for leaks – After the first start, inspect all connections for fuel leaks. The high-pressure fuel line and the pump-to-hanger connections are the most common leak points.

Why You Should Consider KEMSO Fuel Pumps for Your Project

If you are looking for a high-performance fuel pump that offers exceptional value, lifetime reliability, and true OEM replacement quality, look no further than KEMSO Fuel Pumps. KEMSO is a trusted brand that specializes in performance fuel delivery systems for a wide range of vehicles, from cars and trucks to motorcycles, ATVs, and personal watercraft.

KEMSO fuel pumps are engineered as direct OEM replacements. This means they drop right into your factory fuel pump hanger with no modifications required. They are designed to deliver more flow than the stock pump, typically 20% or more at 43 PSI, which provides a significant safety margin for performance upgrades .

Every KEMSO pump is individually tested before it leaves the factory. The company operates under a strict Quality Control Program that meets ISO/TSO standards. This is not the case with many unbranded aftermarket pumps, which have little to no quality control. KEMSO pumps are flow-tested to ensure they meet their rated specifications .

The best part: KEMSO backs every pump with a lifetime warranty. Each pump body is serialized, which guarantees the warranty coverage. This is a level of confidence that very few fuel pump manufacturers offer. When you buy a KEMSO pump, you are buying a product that is designed to last the life of your vehicle .

KEMSO pumps are compatible with both gasoline and E85/ethanol fuels. They feature a bypass valve set at a higher pressure than the original pump, which ensures consistent fuel delivery under high-demand conditions. The pump body diameter is typically 3.8cm, which fits most factory fuel pump modules without modification .

For the 1989 Turbo Trans Am and many other GM platforms, KEMSO offers a range of 340LPH high-performance pumps that are capable of supporting applications up to 700-800 horsepower. These pumps are similar in size to the popular Walbro 255 GSS342 but offer more flow. They are an ideal upgrade for anyone who wants to push their engine beyond the limits of a standard 255LPH pump .

Visit KEMSO today to find the perfect fuel pump for your vehicle. Whether you need a direct OEM replacement or a high-flow performance upgrade, KEMSO has the right pump at a competitive price. Their website is easy to navigate, and their customer support team is based in the USA and staffed by technicians who understand fuel systems .

Click here to shop KEMSO Fuel Pumps: https://www.kemsoracing.com/

Final Thoughts

The 1989 Turbo Trans Am is a legendary car, but its fuel system needs to be brought into the modern era. The Racetronix RFPK-011 kit with the RXP255 pump is the gold standard for this application. It provides a complete solution that includes not just a high-quality pump, but also the wiring harness that is essential for the pump to perform at its peak. The plug-and-play installation, combined with the 255LPH flow rate and turbine technology, makes this the most reliable and cost-effective upgrade you can do for your car.

If you are planning a high-horsepower build, consider upgrading to a 340LPH pump from KEMSO. For most street-driven and mildly modified Turbo Trans Ams, the RXP255 is more than enough fuel. Do not cut corners on your fuel system. A properly sized and installed fuel pump, with a good wiring harness, is the foundation of a reliable and powerful engine.

For high-quality, lifetime-guaranteed fuel pumps, visit KEMSO Racing at https://www.kemsoracing.com/