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No power to fuel pump. Any ideas?
Posted: Sat Oct 10, 2009 4:04 pm
by grover
I just tried to start my car for the first time in 10 days or so (it had been running fine for a couple of years prior to that) and have zero power to the fuel pump. Tracing it back through the system, I've found that I am definitely getting 12v switched to the relay (the engine will crank), and that all the fuses on the relay board are fine. However, when turning on 12v switched, I detect no power going into the fuel pump fuse. Does this sound like a problem with a relay perhaps? I went ahead and rotated the relays around and re-tested, but couldn't find any combination that delivered power to the fuel pump. I'm running an MSII V3 in conjuntion with the relay board. Thanks in advance for your ideas and input.
Re: No power to fuel pump. Any ideas?
Posted: Sat Oct 10, 2009 6:13 pm
by Ollie
Fuel Pump will have a short priming cycle of 2 or 3 seconds when the key is first turned on. will not start running again untull it receives RPM signal from distributor.
Re: No power to fuel pump. Any ideas?
Posted: Sat Oct 10, 2009 6:38 pm
by grover
I know that the fuel pump only stays on for a couple of seconds, but if I recall correctly it will do that 3 second on-period each time you turn on the key. The pump is not turning on at all, even for only 2-3 seconds.
Re: No power to fuel pump. Any ideas?
Posted: Thu Oct 15, 2009 7:25 pm
by twofouroh
Can you hear the FP relay click on and off? Do you have a stim to check it on? Can you hook it up to megatune and see what state the cpu has it in? Or maybe a voltmeter to just check the FP wire as it comes out of the case at the MS. If the fuse is ahead of the relay in the fp circuit the problem is definitely wiring or traces.
Good luck!