1st Generation Specific 1979-1985 Discussion

Stock Fuel Pump

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Old 06-06-2004, 12:29 AM
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Yet another '84-'85 fuel pump weirdness thread. What I mean by that is the fuel pump won't run unless the trailing coil is something something. It's a relay that turns the fuel pump off for safety reasons.
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Old 06-06-2004, 09:06 AM
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Originally Posted by Jeff20B' date='Jun 6 2004, 01:29 AM
Yet another '84-'85 fuel pump weirdness thread. What I mean by that is the fuel pump won't run unless the trailing coil is something something. It's a relay that turns the fuel pump off for safety reasons.
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Old 06-06-2004, 11:37 AM
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You'd have to see the other forum to understand. It seems to pop up there like once a week.
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Old 06-06-2004, 11:58 AM
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Originally Posted by Jeff20B' date='Jun 6 2004, 12:37 PM
You'd have to see the other forum to understand. It seems to pop up there like once a week.
Well I don't want you to think I'm acting like the other forum...LOL.



Got the Walbro in place where the old pump was...now for fittings and new hoses. All the hoses under there are exhibiting dry-rot!
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Old 06-06-2004, 12:19 PM
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the 84-85 setup works like this: dizzy sends tach signal to ecu, ecu sees it and turns on pump. the 79-83 setup just has the pump connected to the "on" position of the ignition switch
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Old 06-06-2004, 01:11 PM
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With the Haltech, am I going to need anything else to make the pump work?
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Old 06-06-2004, 01:42 PM
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Originally Posted by Dysfnctnl85' date='Jun 6 2004, 10:11 AM
With the Haltech, am I going to need anything else to make the pump work?
no, just use the haltech fuel pump wires, thats what they there for
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Old 06-06-2004, 02:05 PM
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Originally Posted by j9fd3s' date='Jun 6 2004, 02:42 PM
no, just use the haltech fuel pump wires, thats what they there for
Excellen, I was thinking/hoping as much!



Thanks as always for the help.
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Old 06-07-2004, 08:24 PM
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Originally Posted by Dysfnctnl85' date='Jun 5 2004, 06:25 PM
Can I not just get the fittings I need for this pump to hook up to what's already there?



Would it be worth it to run new fuel lines?
The 12A type fuel pick up tube may be too small of a straw for the bigger

pump to suck through. The GSL-SE pick up is much larger.

The existing steel lines running to the engine compartment are probably ok -

if you want to upgrade, just run a new 3/8" line to the front and use the old

feed line as the return.

You also need to run new wires to the pump - the stock wiring harness isn't up

to the job. I've even had problems powering a 6 psi pump for a carb. Use about

12 gauge or so from the battery (fused) to a relay (haltech may have provided one)

to the pump. Also don't use the harness ground wire - it's no good either. Just

run a wire from the pump ground to a conventient chassis bolt.
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Old 06-07-2004, 08:57 PM
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Originally Posted by 83turbo' date='Jun 7 2004, 09:24 PM
The 12A type fuel pick up tube may be too small of a straw for the bigger

pump to suck through. The GSL-SE pick up is much larger.

The existing steel lines running to the engine compartment are probably ok -

if you want to upgrade, just run a new 3/8" line to the front and use the old

feed line as the return.

You also need to run new wires to the pump - the stock wiring harness isn't up

to the job. I've even had problems powering a 6 psi pump for a carb. Use about

12 gauge or so from the battery (fused) to a relay (haltech may have provided one)

to the pump. Also don't use the harness ground wire - it's no good either. Just

run a wire from the pump ground to a conventient chassis bolt.
Thanks for the info, I will check with the new RX-7 parts store I found locally.
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