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Old 06-20-2012, 03:14 PM   #1
banshee04
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Default Hard Wire Fuel Pump "How To"????

Im running out of fuel when I shouldnt be. Is there a write up of something that shows/tell how to hard wire the fuel pump to get constant voltage?
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Old 06-20-2012, 03:55 PM   #2
Cr4ckfi3nd
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Huh? more info please. Big turbo, injectors, fuel pump, tune? What do you mean by "running out of fuel"?
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Old 06-22-2012, 12:12 AM   #3
banshee04
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FP Red, 1400cc Inj, DW 300lph pump, E85 on only 23psi. IDC's are already at 97%. The fuel system is good for around 600Whp.

So I need to "re wire" the fuel pump where its gets constant voltage so the pressure doesnt drop off up top.

I really just need to know which wire on the fuel pump harness is the trigger wire for the fuel pump.
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Old 06-22-2012, 01:45 AM   #4
mod maniac
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Increase fuel pressure.
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Old 06-23-2012, 03:17 PM   #5
Tyrael
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I'm actually in the process of working on this right now. I helped hard wire a GC running on an AEM and was able to get the fuel pump at 100% all the time. I'm now working on my car (02 wrx) and if I run the pump 100% (Direct 12v from the battery via a relay - as the aeromotive pump instructions suggest and direct to ground) I'm getting a CEL for fuel pump primary circuit. While this makes sense to me and I can turn it off, I'm not 100% sure on if I need the ground to the chassis or if the controller's ground will net me the desired effect (keeping fuel pressure up top like the OP)

BTW OP:

Looking at the Male Connector (You can de-pin this and not have to cut the wires if you have another pin you can re-use like an injector clip) The Black with Red stripe is the 12v from the controller and the solid black below that is the ground from the controller. So:

Male

12v ? ?
G ? ?

I don't have a Fuel pressure gauge however my ID1000's are maxed currently (113%) on base Fuel Pressure, but only from 6k+ (I rev to 8 so that's a problem).

So if you could PM me the results of just doing the 12V constant and re-using the controller ground it would be super helpful. PM me with any questions / advice haha.

Mod Maniac may be correct in your case because your injectors are not maxed, however you're running out of fuel, but I know that the Aeromotive pump needs more amperage than the stock wiring can give it.

let me know how it works!
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Old 06-24-2012, 02:41 PM   #6
apexanimal
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this was a common problem on neon srt4's... the wire gauge was too thin and would heat up and show a voltage drop...

painless makes a nice relay that you run a wire to the battery, a good ground, and then your switch line is your oem pump wire... that way you can run a heavier gauge power wire...
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Old 06-24-2012, 04:18 PM   #7
Tyrael
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Quote:
Originally Posted by apexanimal View Post
this was a common problem on neon srt4's... the wire gauge was too thin and would heat up and show a voltage drop...

painless makes a nice relay that you run a wire to the battery, a good ground, and then your switch line is your oem pump wire... that way you can run a heavier gauge power wire...
Exactly what I did, except i used Ye Olde 30amp relay to power the pump (controller voltage is my on/off, clean ground and 12v from the batter via my existing sound system 0ga wiring).

So far so good...
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Old 12-31-2012, 02:04 AM   #8
Irv Weissmanhowerton
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bump, who's got some more stories?
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Old 12-31-2012, 02:30 AM   #9
maxpowr
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