1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

walbro 255 lph fuel pump rewire

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Old Sep 28, 2004 | 11:15 PM
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Question walbro 255 lph fuel pump rewire

I've heard of people rewiring there fuel pump to compensate for the higher current pull of a walbro, and since my fuel pump isent getting any power anyway I figured what the hell. I need a wiring diagram or maybe a good write up.
any help is appreciated.
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Old Sep 28, 2004 | 11:52 PM
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If yours isn't getting ANY power, I don't think that switching pumps will help. At any rate, you do not have to wire anything to compensate for the higher current flow. There is nothing special, the Carter wires in just like your original was and thats it.
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Old Sep 29, 2004 | 04:19 PM
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well I wasent replacing the pump because the stock one wasent getting power. I needed a bigger fuel pump and was under the impression that a, bigger pump=bigger motor= higher current draw, would need bigger wires.
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Old Sep 29, 2004 | 04:53 PM
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Just run a new 10 AWG wire to the pump and use the old fuel pump 12V+ wire (if it works) to turn a relay on and off mounted back there by the walbro. It's just one way to do it.
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Old Sep 29, 2004 | 05:01 PM
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ok thanks, any ideas on why my fuel pumps not getting any power. it's got a Turbo II swap with the full fc harness. it wont even turn on if I jumper the yellow plug on the passengers side shock tower, all I hear is the relay.
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Old Sep 29, 2004 | 05:23 PM
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Even through you can hear the relay doesn't mean it is working. I could hear mine, but my pump wasn't getting any power. So I bypassed the relay and it gets power now.
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Old Sep 29, 2004 | 05:39 PM
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Wouldn't it be bad to just bypass the relay, I thought the Gsl-se had some sort of pressure switch?? That was my original question, If I wanted to run a new power line back to the fuel pump, would I run it from the ECU or the ignition switch??
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Old Sep 29, 2004 | 05:40 PM
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I'm just a little confused on how the fuel system gets it's power.
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Old Sep 30, 2004 | 04:31 AM
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anybody??
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Old Sep 30, 2004 | 04:37 AM
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okay here is what you do
you run a relay, the relay get constant 12 volt powere STRAIGHT from the battery, you run the trigger wire on the relay to any ignition triggered 12 volt + wire
that makes it so when the ignition is on it triggers the relay and gives the pump DIRECT power from the battery rather than running through the whole electrical system
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Old Sep 30, 2004 | 04:39 AM
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oh and ground the fuel pump directly to the chassis rather than using the stock grounding wire
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Old Sep 30, 2004 | 04:40 AM
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compensate the fuel pump for where it says the fans on that diagram

Last edited by Gregs; Sep 30, 2004 at 04:43 AM.
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Old Sep 30, 2004 | 04:41 AM
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good luck, let us know how it goes
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Old Sep 30, 2004 | 03:20 PM
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alright thanks alot, thats exactly what I was looking for
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