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Guest Message by DevFuse

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1984 BRAT... what tells the fuel pump to "RUN" and not just "PRIME"?

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3 replies to this topic

#1 backwoodsboy



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  • upstate NY, in the woods

Posted 26 April 2008 - 07:42 AM

Hey everybody,

Im sure this has been covered SOMEWHERE before, but can anyone enlighten me as to what tells the factory fuel pump on a 1984 Brat to pump fuel *all* the time?

I turn the key *on* and the pump cycles for a second (primes) ... then shuts off.

(This is for the EJ swapped Brat BTW)

Im just using the factory pump to fill the surge tank under the hood, but its not going into RUN mode for some reason. (the ECU controlled fuel pump works fine... should I just run a parallell relay off that control wire?)

Thanks very much!

#2 GeneralDisorder


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Posted 26 April 2008 - 12:16 PM

At the drivers side kick panel attached above the hood release cable bracket you will find the fuel pump control unit (or revolution sensor). It needs a tach signal to run the pump after it primes for a few seconds.


#3 backwoodsboy



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  • upstate NY, in the woods

Posted 26 April 2008 - 12:28 PM

Thanks very much GD.

I suspected that it would be a tach signal. I heard the relay clicking up there somewhere.... have to investigate. :cool:

#4 kiwi subbie

kiwi subbie

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  • Christchurch, New Zealand

Posted 27 April 2008 - 01:30 AM

ive got the oppersit problem.
ive noticed my brumby fuel pump says on all the time and doesnt prime then slows down or stop etc like how my other old leones did when you 1st switch the key on. would the fuel pump wear out with it running like that? what can i do to get this to run normal?

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