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Old 01-02-2006, 01:16 AM   #1
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fuel pumps don't come on

I had an 86 mustang 5 speed and put the gt40 motor with aluminum heads, gt40 manifolds, s trim vortech supercharger which came with the msd boost ****** and fmu, msd ignition, the mass air conversion kit (came with 24 lb injectors 70mm mass air sensor and i think a cobra computer, and a bunch of other stuff. That car was hit in the rear and totalled so I got a 91 mustang and transferred everything over to it. It was an automatic when I got it now it's a 5 speed. anyway when i turn the key on the fuel pumps don't come on. anyone know what would cause this? I unplugged the fuel pump relay and jumped across 2 of the wires and they came on so i put a switch between those 2 wires so I can drive it till I figure out why they don't come on with the key. anyone have any suggestions?
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Old 01-02-2006, 03:03 AM   #2
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Re: fuel pumps don't come on

ok, this may be a stupid question but sometimes the obvious is what bites you the hardest.

Did you try swapping relays to see if the relay was just bad?
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Old 01-19-2006, 07:11 AM   #3
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Re: fuel pumps don't come on

Sounds like you need to replace the fuel relay..
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Old 01-19-2006, 08:24 AM   #4
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Re: fuel pumps don't come on

check under the carpet in the trunk, right behind the left taillight. There is a fuel pump cut off switch. try pushing the red button down, it should fix your problem if it has been triggered.
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Old 01-21-2006, 03:59 AM   #5
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Re: fuel pumps don't come on

already did all that and they still don't come on.
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Old 02-15-2006, 10:52 AM   #6
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Re: fuel pumps don't come on

neutral kill switch for the automatic trans
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Old 02-18-2006, 03:36 AM   #7
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Re: fuel pumps don't come on

i have a manual transmission. Could it be that that part of the ecm isn't working. If so that very well could be what it is.
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Old 02-18-2006, 07:16 PM   #8
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Re: fuel pumps don't come on

....or an open relay wire going to pin 22 in the ECM, or an open wire between the EEC relay and the FP relay (they share Ign On voltage). My 2.
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Old 02-19-2006, 01:45 PM   #9
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Re: fuel pumps don't come on

Quote:
Originally Posted by fast64
check under the carpet in the trunk, right behind the left taillight. There is a fuel pump cut off switch. try pushing the red button down, it should fix your problem if it has been triggered.
I dont think that will fix his problem.....no to argue though. If the fuel pumps come on while jumpin wires that means the problem is from the relay to the ignition switch...not to the pump.
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Old 02-19-2006, 05:12 PM   #10
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Re: fuel pumps don't come on

that is true. sounds like a relay problem then.
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Old 02-22-2006, 03:08 AM   #11
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Re: fuel pumps don't come on

i've unplugged the fp relay and took 2 of the wires and jumped across them and they came on so for now i put a switch between those 2 wires and manually turn the pumps on before i start it then off when i stop. To me it seems like i should have way more power than i do overall for everything that the car has in it.
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Old 02-22-2006, 10:21 AM   #12
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Re: fuel pumps don't come on

have you tried putting another relay in so you don't have to use the switch?
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Old 02-23-2006, 02:03 AM   #13
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Re: fuel pumps don't come on

yes. I've also replaced the eec relay
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Old 02-24-2006, 07:06 PM   #14
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Re: fuel pumps don't come on

Dana;

Check the wiring diagram attached (Courtesy of Veryuseful.com) for the '91, it will help you in tracing the wires. Click image for larger version

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You should have voltage all the time at the Pnk/Blk wire. Voltage at the Red wire with Ign On only. Otherwise, need to trace either back for an open to the fuse link or the EEC relay.

Dk Grn/Yel wire goes to the FP, no problem there.

Now, the Lt Blu/Org is the wire that gets the ground from the ECM to activate the relay, thus the FP. Check it out bet it's a wiring SNAFU. LUK
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