Fuel pump ... yup, another thread
Discussion
Didn't use the car for at lest three weeks. The battery was nearly flat. Starter motor could still turn the engine over, but only just, and the engine wouldn't start. I noticed I couldn't hear the whine from the fuel pump.
Got the AA out, and the geezer confirmed with a multimeter that the fuel pump wasn't receiving any power. He also could see a signal going to the fuel injectors, concluding that the ECU is still working. Also the relay that the AA bloke identified as the fuel pump relay was clicking as the ignition was turned on and off. And the fuse was still OK.
Am I right in assuming that the immobiliser interrupts the fuel pump circuit before the relay, so that the relay would not get activated at all if the immobiliser was on? If that is so, thenthis doesn't sound like an immobiliser fault.
Other options would then be, the relay is shagged (clicking but not actually switching) or the wiring between the relay and the pump has mysteriously fallen apart while the car is stationary.
Anyone know what the deal is with the immobiliser, or have any other ideas? Thanks in advance ...
>>> Edited by ATG on Tuesday 23 September 20:19
Got the AA out, and the geezer confirmed with a multimeter that the fuel pump wasn't receiving any power. He also could see a signal going to the fuel injectors, concluding that the ECU is still working. Also the relay that the AA bloke identified as the fuel pump relay was clicking as the ignition was turned on and off. And the fuse was still OK.
Am I right in assuming that the immobiliser interrupts the fuel pump circuit before the relay, so that the relay would not get activated at all if the immobiliser was on? If that is so, thenthis doesn't sound like an immobiliser fault.
Other options would then be, the relay is shagged (clicking but not actually switching) or the wiring between the relay and the pump has mysteriously fallen apart while the car is stationary.
Anyone know what the deal is with the immobiliser, or have any other ideas? Thanks in advance ...
>>> Edited by ATG on Tuesday 23 September 20:19
Disclaimer: I've got a Griff.
However I had a fuel pump failure last week - got the AA out to check the relays and fuses and they were all OK. However it was getting dark and the AA guy noticed arcing from the fuel pump supply fuse.
The fuse tested OK because the fuse hadn't blown - but the fuse had been forced in incorrectly and one of the fuse legs had bent. Thus even though the fuse hadn't blown, sparking from one leg to the other dropped the voltage to the relay and stopped the pump working.
This was a real random non-TVR failure, but definitely worth pulling the fuse out to check it's seated properly.
A new fuse and I was away, no worries since then.
However I had a fuel pump failure last week - got the AA out to check the relays and fuses and they were all OK. However it was getting dark and the AA guy noticed arcing from the fuel pump supply fuse.
The fuse tested OK because the fuse hadn't blown - but the fuse had been forced in incorrectly and one of the fuse legs had bent. Thus even though the fuse hadn't blown, sparking from one leg to the other dropped the voltage to the relay and stopped the pump working.
This was a real random non-TVR failure, but definitely worth pulling the fuse out to check it's seated properly.
A new fuse and I was away, no worries since then.
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