Question about Ford Mustang
Have done the eec test and fuel pump works and also checked relay and was fine getting 12v from the yellow but when you turn the key on no 12v on pink black wire unless i do the eec test and red is 12v with key on which is from the inertia switch but then the tanish brown one is the problem with the eec test it gets no voltage and without it gets 12v whhich i found out only is suppost to come on when the pump stops pumping as i found out on my 89 f150. when i turn the key on the fuel pump, pumps 0V until it stops itself which is when the tan/brown gets 12V I think there is a relay somewere in the dash that has gone bad. because when i turn it off it stays on for a couple of secs (12v at brown/tan) and then you hear a small click coming from the passenger side dash (0v brown/tan)i already went threw this check list http://www.allfordmustangs.com/forums/5-0l-tech/120806-fuel-injected-mustangs-crank-no-start-checklist.html
See if the oil pressure switch has 3 prongs. If so and it's leaking oil, that may be the problem. I can't recall what year they stopped doing that switch but my '89 had it. Aside from that, check the fuel pump relay. It can click and still not supply power to the pump.
Posted on Apr 02, 2014
Testimonial: "well i already checked the fuel relay which is under the drivers seat in 1985 lx mustang v6. The click im hearing though is not the problem its just when that happens thats when the pump shuts off or the voltage changes in my f150 which is working correctly but i know its not the relay because I swapped the relay into my truck, in the mustang the fuel pump is not working correctly its like what I was saying above the pump is suppost to prime when you first turn key on and the tan/brown wire is suppost stay off for a couple of seconds (12v black/pink at this time) and then tanish/brown wire gets 12v (0v Black/pink wire at this time)so what ever is triggering that brown or tanish (im not sure of the color on this wire) wire is what makes the black/pink get 12V when its at 0V with the key on. and when that happens the fuel pump comes on beacuse that wire goes all the way to the fuel pump and if i do the eec test it makes the tanish/brown wire 0v and the pump will come on unless the inertia switch has been tripped. Also how would the oil leak cause it to make the fuel pump not to come on, also this all happened when I used the fuel pump test on the eec to ground and pump the old gas out the tank but after i was done the pump will not prime or pump while started unless you use the eec test and you will be able to make the pump run to start but that is the only way it will work now."
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Posted on Jan 02, 2017
SOURCE: my 2000 a6 wont start,
I SAY ITS THE FUEL PUMP.CHECK FOR BATTERY VOLTAGE AT BATTERY TERMINAL TO FUEL PUMP.CHECK TERMINALS 1 AND 4 FOR POWER.IF POWER GOING TO TERMINALS 1 AND 4. I SAY FUEL PUMP BAD.
Posted on Apr 27, 2011
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