Thread: Fuel pump running with key off

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  1. #21 Re: Fuel pump running with key off 
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    It eliminates a lot of voltage loss. Also the stock ga. Wiring is way to small for a 255 or anything bigger
    - 2001 Grand Prix XGT -- 11.21@124MPH
    - 2010 Chevy 2500HD LTZ -- Car hauler
    - 2011 BMW 328i Xdrive -- Wife's Daily
    - 2014 Ford F250 crew cab -- 6.2 liters of ford fail
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  2. #22 Re: Fuel pump running with key off 
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    I guess it only matters if you have mods done. Huh?
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  3. #23 Re: Fuel pump running with key off 
    I break stuff selliott's Avatar
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    Quote Originally Posted by Dacton1985 View Post
    I guess it only matters if you have mods done. Huh?
    Not necessarily, it's supposed to help even if your stock, will you notice a difference probably not
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  4. #24 Re: Fuel pump running with key off 
    GrandPrix Junkie
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    Quote Originally Posted by Dacton1985 View Post
    I guess it only matters if you have mods done. Huh?
    I've seen a 4.3v drop in power to the pump through the factory wiring on a car I was driving daily. The wiring is way too small to carry power to the pump causing fuel delivery issues even on stock cars at higher rpm. Most daily driven cars have this drop and no one ever knows. But when you start watching the data, you see it starting to run lean and the injector duty cycle spikes to try to compensate. Terrible design. The Racetronix rewire is what I used to combat it and it worked great.
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  5. #25 Re: Fuel pump running with key off 
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    I can understand it on a rising rate system as you add pressure you increase the need for current. The funny thing is that I see none of that on my 05' which is fixed pressure. My pressure remains the same throughout a run and my system never leans out even on E85. Then again the car is bone stock except for the tune to run E85
    An engine is an engine no matter the size.... I think Dr. Seuss said that... or maybe it was Big Weld....
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