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 09-28-04 | 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.
Old 09-28-04 | 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.
Old 09-29-04 | 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.
Old 09-29-04 | 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.
Old 09-29-04 | 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.
Old 09-29-04 | 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.
Old 09-29-04 | 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??
Old 09-29-04 | 05:40 PM
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I'm just a little confused on how the fuel system gets it's power.
Old 09-30-04 | 04:31 AM
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anybody??
Old 09-30-04 | 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
Old 09-30-04 | 04:39 AM
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oh and ground the fuel pump directly to the chassis rather than using the stock grounding wire
Old 09-30-04 | 04:40 AM
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compensate the fuel pump for where it says the fans on that diagram

Last edited by Gregs; 09-30-04 at 04:43 AM.
Old 09-30-04 | 04:41 AM
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good luck, let us know how it goes
Old 09-30-04 | 03:20 PM
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alright thanks alot, thats exactly what I was looking for
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