feul pump controller

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04-06-2003, 06:33 PM

truesuby

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feul pump controller

as we all know our fuel pump worls on different volts to give us the right amount of gas needed. low RPM 9 volts, high RPM 12 volts. I was wondering if the is a way to relay the fuel pump controller so it work at 12 volts at all time. if anyone has info i would truely appreciat it.

04-06-2003, 06:59 PM

teiva-boy

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Location: San Diego

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Car Info: Boosted Geo Prizm

Yeah just hook it directly to a 12V switched circuit. Nothing particularly difficult about it.

Any particular reason you want to or need to do this?

04-06-2003, 07:08 PM

truesuby

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i have a high flow pump and i would like to see if the flow would be better

04-06-2003, 07:45 PM

Kevin M

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Car Info: 1993/2000/2001 GF4 mostly red

It would, but it'll screw with your A/F for a while while the ECU adjusts. You'll probably notice a lot of smoke too for a while. Unless you're running nitrous or high boost, your stock injectors and pump are fine. Don't mess with it until you have to.

04-06-2003, 09:07 PM

teiva-boy

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Location: San Diego

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Car Info: Boosted Geo Prizm

Too add to that, heated fuel may recirculate back into your tank leading to detonation.

If you need to have more fuel, raise your fuel pressure via an adjustable regulator. Other then that, there is no point in doing this at your current state of tune.

04-07-2003, 08:59 AM

azscoobie

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Re: feul pump controller

Quote:

Originally posted by truesuby
as we all know our fuel pump worls on different volts to give us the right amount of gas needed. low RPM 9 volts, high RPM 12 volts. I was wondering if the is a way to relay the fuel pump controller so it work at 12 volts at all time. if anyone has info i would truely appreciat it.

The Fuel pump controller does not limit voltage. It limits time that the voltage is applied. The pump always gets 12-14 volts depending on alternator output. If you use an analog RMS volt meter you will see the RMS which is the avg voltage.

Running a #10 line from the battery to the fuel pump and switching the line active via a relay triggered off the fuel pump signal pin on the ECU would work. The problem is that each step of voltage 33%/66% and 100% provides an avg of 10 psi increase in fuel pressure. At idle and low speed the ECU is programmed for that lower pressure. With the pump running 100% all the time the fuel trims will be negative.

Save the time and effort. We have tried this. Without a stand alone ECU such as the link this is just not a good idea. If you need more fuel simply buy a larger fuel pump or better yet purchase larger injectors.

HTH

CT