classic fuel pump wont prime or start car
07 May 2014, 02:35 PM
#1
classic fuel pump wont prime or start car
Version 3 type r.
I cant get any priming noise from the pump at all and the car will not start.
Things I know so far.
Pump works when 12v applied to it
black plug under rear seat is ok and all connections have continuity
fuses are all ok
The black wire with red stripe does give 12v when ign is switch on but quickly drops to zero. Is that the priming circuit or should it be permanent 12v with ign on? It does stay at 12v while cranking.
I look to have 2 relays. One is a round one like the fog light relay and the other is a small red one that I cant feel or hear clicking. What does the red relay do.
As you can imagine I have no power at the pump and the black/red wire is spliced by an immobiliser so I am trying to source the fault.
I cant get any priming noise from the pump at all and the car will not start.
Things I know so far.
Pump works when 12v applied to it
black plug under rear seat is ok and all connections have continuity
fuses are all ok
The black wire with red stripe does give 12v when ign is switch on but quickly drops to zero. Is that the priming circuit or should it be permanent 12v with ign on? It does stay at 12v while cranking.
I look to have 2 relays. One is a round one like the fog light relay and the other is a small red one that I cant feel or hear clicking. What does the red relay do.
As you can imagine I have no power at the pump and the black/red wire is spliced by an immobiliser so I am trying to source the fault.
Last edited by Welloilbeefhooked; 07 May 2014 at 03:06 PM.
07 May 2014, 03:56 PM
#2
Both relays work when connected to the green plug and neither click or work in the light brown plug suggesting the relay isn't at fault.
I'm assuming the light brown plug is the priming circuit?
So what would cause this circuit not to trigger the relay?
I'm assuming the light brown plug is the priming circuit?
So what would cause this circuit not to trigger the relay?
07 May 2014, 07:37 PM
#3
Unmapped 12.4s @ 105
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Have you ruled the immobiliser out, Wayne?
I had bother with my car cutting out, not starting etc last year. I don't do electrics so just replaced relays and such like. It would work for a while then start acting up again.
It cut out on my going round a busy roundabout during rush hour, which wasn't fun at all, and that was the final straw. Eventually got an Auto Electrician to come out *, they bypassed the immobiliser from the fuel pump wiring or something and it started first time.
* All the places I phoned, I even walked to one local, all I got out of them was; "Yeah, that's not a problem, just fetch it along." If it would ******* start, I wouldn't be asking you to come and bypass the ******* immobilier would I!?!
I had bother with my car cutting out, not starting etc last year. I don't do electrics so just replaced relays and such like. It would work for a while then start acting up again.
It cut out on my going round a busy roundabout during rush hour, which wasn't fun at all, and that was the final straw. Eventually got an Auto Electrician to come out *, they bypassed the immobiliser from the fuel pump wiring or something and it started first time.
* All the places I phoned, I even walked to one local, all I got out of them was; "Yeah, that's not a problem, just fetch it along." If it would ******* start, I wouldn't be asking you to come and bypass the ******* immobilier would I!?!
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