The fuel pump upgrade using directions from dsm.org

[koreanpersuasio]

I used to be an alarm and stereo installer. So i can do the fuel pump rewire. The directions (on dsm.org) state to use a 30 amp relay, but they dont even use the switch part of the relay to turn it on and off. Meaning that 12 volts would be always running to the fuel pump. Thats what i would have thought you would need the relay for. If we are connecting the power directly to the battery with no on/off switch..why do we need the relay?

I have a capacitor already installed in the rear for my subwoofer amplifier. I would assume since the fuel pump only needs power when the car is turned on, i could run the 10 gauge power directly from the capacitor correct? The capacitor only comes on when the car is turned on (acc and on positions) . Will it harm the fuel pump or wiring if i just add the 10 gauge wire to the fuel pump without cutting the factory wire off? thanks again.

 

[larryd]

i moved this to electronic/fuel tuning.

 

[L2RTSiAWD]

The point of the rewire is to always have 12 volts running to the fuel pump.

Later,

 

[Puke]

Originally posted by MuttedTSiAWD
The point of the rewire is to always have 12 volts running to the fuel pump.

Later,

What would be the purpose of that?? It seems it would only keep it primed(keep pressure) when the engine is off??

 

[KenTSIII]

You use the stock wire going to the fuel pump to switch the relay... that way the fuel pump operates like stock.

 

[Enigma_Man]

The relay is for this purpose:
It uses the existing wiring as the "control" for the fuelpump, and the 10-gauge directly from the battery as the power for the pump. This way, the pump sees the full 12-14 volts when on, (instead of something like 10ish without the rewire) and when the car wants the pump to turn off, it will.

The relay allows the pump to be on only when the car wants it to be. I'm not sure if it would ever shut off, but it retains stock functionality without much hassle.

You probably could accomplish basically the same functionality using wiring off of your stereo or whatever... but it seems to me that it's just asking for trouble somewhere down the road.

-Jesse

 

[dsmnate]

I am going to be installing a 4 gauge power wire for my stereo system. I running this to a distribution block and was planning on running a new 10 gauge wire to my fuel pump from there. Would this be a problem? I don't see how it would be any different than running the 10 gauge from the battery.

 

[KenTSIII]

Should work fine..

 

[Puke]

Originally posted by MuttedTSiAWD
The point of the rewire is to always have 12 volts running to the fuel pump.

Later,

Sorry! I read that wrong........ I read that and thought you were saything that the point was to have 12V at the fuel pump at all times and I was thinking what good would that do when the engine was off.

Anyway, I understand...........

 

[91gsx]

use the vfaq. i did mine just the other day & it works flawlessly. it does use the stock wiring as the so to say "on off power supply", the wire coming from the battery IS only used when the fuel pump is running.