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Racetronix C5-C6 Corvette Fuel Pump Hotwire Harness
Racetronix C5-C6 Corvette Fuel Pump Hotwire Harness
  • SKU: 672-FPWH-008

Racetronix C5-C6 Corvette Fuel Pump Hotwire Harness

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  • Plug & Play (no cutting or splicing required)
  • Weatherproof factory connectors
  • Heavy 10 gauge automotive-grade copper wire
  • Heavy-duty 40 amp weatherproof relay
  • Weatherproof fuse holder
  • Alternator-direct power for maximum pump performance
  • Silicon grease, spare fuse, wire ties included
  • Stainless steel mounting hardware
  • Compatible with various pump boosters (i.e. KB, MSD) (optional)

This harness will work in all C5 Corvettes manufactured 2003 1/2 and later with VIN # 114931 (last six digits) and up as well as all C6 Covettes through 2013 excluding the ZR1.

* When installing a new pump or module we highly recommend purchasing our IPH-008 intermediate pump harness to replace the undersized factory harness. This harness runs between the driver's side wheelwell to the connector on the fuel module at the top of the tank. Access to this area (dropping the tank) is typically required to install this intermediate pump harness.

Why use a Racetronix Fuel Pump Upgrade Harness?


Alternator-direct power for maximum voltage / True PnP with GM type connectors:

The 2003+ C5 Corvette is equipped with a top-loaded fuel module which contains a Walbro vane-type fuel pump. This module has an integrated fuel pressure regulator and fuel filter. The Walbro vane pump used in this new module flows less fuel than the Walbro gerotor pump used in previous model C5's. Having the regulator located in the module moves the point of regulation farther away from the fuel rail. This reduces the fuel pressure stability at the rail even further. Racetronix will be releasing a fuel pump upgrade for this application however removing the fuel module is a major job in this case. The exhaust system and transaxle must be dropped  in order to remove the DS fuel tank which contains the fuel module. The module itself is very difficult to re & re from the tank. For these reasons most C5 owners who have this system will chose to use external devices to boost fuel pump performance. This is where the Racetronix fuel pump upgrade harness comes into play. The Racetronix PnP upgrade harness provides alternator-direct power for maximum pump voltage. Racetronix has documented an average 1.0-1.2V increase in pump supply voltage on the 2003+ C5. This equates to a 10-15%  increase in pump volume. A minor increase in fuel pressure will actually be experienced with the installation of this harness. The harness is fully 'plug & play' so it is installed without cutting into the factory wiring. The entire harness is waterproof made with the same Delphi interconnect components used throughout your C5. The harness' operation is quite simple. The factory power wire which was once used to supply the fuel pump is used to trigger a 40 amp relay which in turn supplies power directly from the car's alternator with fused protection.

Redundant grounds = improved voltage & reliability:

A redundant ground is provided which loops into the harness. This loop enhances the pump's ground providing a two-fold  improvement.

Pump booster PnP ready:

Most people installing supercharger, turbo or nitrous oxide systems in a 2003+ C5 will chose to use a fuel pump booster / voltage amplifier (KB BAP or MSD) which can increase vane pump performance upwards of 50%. Up until now people installing a booster would have to cut into the factory wiring harness which for many reasons is not a very good approach. This is no longer required with the Racetronix harness as it is equipped with an intermediate high-current (30 amp) connector just after the relay. This allows for easy plug & play addition of a pump voltage booster. The Racetronix harness removes the increased load off of the factory wiring created by the booster's amplification process. The Racetronix harness only supplies power to the pump booster when the vehicle computer commands fuel pump operation so there will be no parasitic load on your battery when engine is not running. The Racetronix harness allows the booster to be removed easily should the need arise. The booster is easily mounted inside the open area behind the driver's side rear wheel well covering where these is plenty of room, good ventilation and minimal exposure to the elements. This area is easily accessible and prevents the booster's installation from adding to underhood clutter. An optional connector set is available so that any booster can be adapted to plug into the Racetronix harness. The Racetronix harness further enhances the pump booster's performance by eliminating the factory wiring's voltage drop which would require more voltage amplification as compensation. The heavy 10 gauge power feed is rated at 30 amps (relay 40 amps) which is more than capable of handling the 15+ amp load generated by the booster and pump at elevated voltages. The best part is that the Racetronix harness is so easy to install that the labor savings will usually pay for the harness itself when compared to hardwiring a permanent solution from scratch.

Hardware included:

Plenty of wire ties are included as well as a SS mounting hardware for the fuse holder, spare 20A ATC fuse and silicon grease to prevent corrosion and lubricate the chassis-mounted ground leads .

Racetronix harnesses are considered the best by which all others are judged. Attention to detail in every Racetronix harness is evident at first glance. Racetronix spares no expense to ensure reliability, ease of installation and performance.
All Racetronix harnesses are assembled using our computerized crimp-quality monitoring system and then circuit checked for the utmost in reliability. This Racetronix harness is backed by our limited lifetime warranty.


The Racetronix harness comes equipped with an interface connector just after the relay. This connector in combination with an optionally supplied connector set (P/N PBIC) allows for easy plug and play addition of a pump booster / voltage amplifier such as the MSD or KB units. These voltage amplifiers / boosters will allow the Racetronix single in-tank pump system to support an additional 100-200 flywheel HP (B.S.F.C. dependant) when run at 16-17 volts. This configuration offloads the excessive current draw placed on the factory wiring onto the heavy gauge Racetronix harness system. System diagnosis becomes easier by simply being able to unplug, isolate and bypass sections of the wiring system.

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