Fuel Pump Relay mod Options

[cax_11]

Anyone did this? to make the pump run at a constant 12v? any improvements if so?

[lagos]

I did.
http://www.6gc.net/forums/index.php?showto...777&hl=fuel

Its a good idea to do and I saw more consistent voltage through the efi system and the fuel pump circuit.
Just make sure you use a higher quality fuse holder than the one I have pictured, because the one in the photos (purchased from walmart) ended up catching fire! I replaced it with a good quality radioshack fuse holder and never had a problem since.

good write up but, i'm a bit lost on how this is actually done.. the way i understand is that you cut a wire on the fuel pump resistor and bypass it so it runs steady 14.5 instead of 9v at idle and part throttle and 14.5 at wide open

Yes, but i went a step further than that.
Basically, from the factory the fuel pump has a low/high voltage mode...but thats not really the problem.

The real issue is that:
1. the fuel pump gets power from the EFI circuit, that is already burdened with running your ecu, various sensors, etc...
2. the factory wiring for the fuel pump is very thin gauge, and that can cause voltage drops to the power hungry aftermarket fuel pumps that we use.

So basically, my write up says to take power for the fuel pump directly from the battery with all new thick gauge wiring, and use the old fuel pump/efi circuit to trigger a relay to turn the new circuit on/off. Makes sense?