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Metal Fuel Tank Earthing

EFI Wiring Fundamentals

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Discussion and questions related to the course Motorsport Wiring Fundamentals

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Hi All,

I have a 1988 Toyota Supra that I am upgrading the fuel pump from the factory unit to a Walbro 450. As the new fuel pump uses considerably more amperage I have changed the wiring to a larger gauge and replaced the factory intank wiring. As with a lot of cars of the that age the fuel tank is steel and the fuel pump hanger is also steel I used a couple of raceworks electrical bulk head terminals to get a new positive and negative into the tank for the pump.


The factory wiring had a smaller gauge positive that was isolated from the metal tank hanger, and used an earth riveted to the steel pump hanger inside the tank and then another earth wire riveted to the pump hanger lid on the outside of the tank which then goes to the earth on the chassis. The tank is hung on straps with rubber isolators.

I have removed the factory earth and reinstalled the tank, but now I feel that I may have made an error as the factory earth also earthed the tank itself. Am I going to end up with issue not earthing the tank? would hate for static to build up or some other issue.

For peace of mind I would reconnect the earth from the tank to the chassis.

I restored the factory earth to eliminate any issues. But thought it was a good topic to discuss as I dont think its covered anywhere else if it is a problem or not.

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