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BLT1 Fuel Pump Wiring Harness HD*

Item #: FPWH-018


per EACH
This is an obsolete Item
 In Stock & Ready to Ship

FPWH-018 - BLT1 Fuel Pump Wiring Harness HD


  • HD version only compatible with new Racetronix BCWA-BLT1 bulkhead wiring assembly only!
  • New 30-amp output connector compatible with 340LPH+ pumps
  • Plug & Play (no cutting or splicing required)
  • Weatherproof factory connectors
  • Heavy 10-gauge automotive-grade copper power and ground wires.
  • Heavy-duty weatherproof relay
  • Weatherproof fuse holder
  • Alternator-direct power for maximum pump performance
  • Silicon grease, spare fuse, wire ties included
  • Stainless steel mounting hardware
  • Body ground upgrade with battery nuts (optional)

This harness can't be used with the factory hanger's wiring. It must be upgraded using our BCWA-BLT1 solution.

Why a Racetronix Fuel Pump Upgrade Harness?

The Wiring Harness aka 'Hotwire harness'

No cutting, splicing, crimping or soldering. Retain factory configuration. Just plug it in and you are done!

High performance fuel pumps need a good power source in order to perform to their full potential. On average a Walbro high-performance fuel pump requires twice as much power as a factory fuel pump. Factory wiring is just enough for a factory pumps power requirements because manufacturers need to save cost and weight. Racetronix field tests have shown that running a high-performance fuel pump off of the factory wiring can cut pump performance by 30% or more. Problems with failing factory relays, connectors/terminals and fuse contacts are also common when excessive load is placed on them.

The Racetronix plug and play harness is designed to remove all fuel pump load from the factory pump circuits while providing the pump with a new heavy-duty power source. The Racetronix harness gets its power directly from the alternator's battery terminal. The voltage at the alternators output is typically 1-2 volts higher than at the battery when the motor is running (high charge/load conditions and WOT). This means that your Walbro high-performance pump can provide as much as 20% more fuel in some cases. The Racetronix harness uses high-quality automotive-grade wire which is resistant to oil, gas, heat and rot. The main length of wire in the Racetronix harness is ten-gauge stranded copper. This is three to four gauges thicker than factory wire which helps reduce resistive power loss to almost non-existent levels. This helps improve pump performance by as much as another 10-20%. (Competitive harnesses typcally use wire which is one gauge thinner than ours). High-quality weatherproof fuse holders and relays are used for maximum reliability. The Racetronix harness has factory-type weatherproof connectors which plug directly into your fuel pump module/sender so no cutting or splicing is required.


The Racetronix harness has a redundant ground upgrade as it is necessary to improve the pump's ground (-) supply as well. Racetronix has integrated the harness ground into the main harness as a one piece assembly. The ground clip helps improve the tank and pump ground. All grounds (including the factory) are routed back to a common piercing ring terminal which provides direct ground from the large tank strap bolt and body. This provides superior clamping force and grounding. The weatherproof relay shares this mounting location so that no mounting holes must be drilled. Silicon grease is provided to coat the grounding clip and ring terminal in order to prevent corrosion.

The Racetronix harness is covered with Nylon loom (GM spec. GMP.PA6.003, -40ºF to 300ºF). Nylon loom is more flexible, slicker, shinier and has a higher temperature rating than the PE loom used by other vendors. Nylon loom provides superior protection and eases installation especially in colder climates.

Our power feed comes off the back of the alternator where voltage is highest. It then runs through a weatherproof fuse holder which is mounted on the back of the alternator. This location keeps the fuse holder out of sight and the unfused wire down to a short 4 inches.

Racetronix supplies a spare 25A fuse, 25 black vinyl wire ties, silicon grease and mounting hardware with each kit.

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.



Some people make the mistake of assuming the thick black wire coming from the battery is a body ground. It is not. It is the motor ground and the motor sits on rubber mounts. Due to the age of the TRs we have seen some body grounds so bad that the lights flicker on the car when in motion. To address this problem Racetronix is offering an optional battery to body ground upgrade kit which upgrades the thin ground wire running from the battery to the inner side of the passenger's fender wall. It includes an 8 gauge copper wire fitted with terminals and battery nuts with accessory taps.. One end attaches to BATTERY - and the other to BODY GROUND. No modifactions to the factory battery terminals or boots are required. The new battery nuts have a bolt on top that allows connections to easily be made to the battery. Simply pop the old factory battery nuts out by pushing them out from behind and pop the new ones in. They even look good too. > BLING :) <

  Please view add-ons and related items listed to the bottom of this web page.
Item #:FPWH-004
In Stock