1989 Ford Mustang fuel pump question

Tiny
MCNKC61
  • MEMBER
  • 1989 FORD MUSTANG
Electrical problem
1989 Ford Mustang V8 Two Wheel Drive Manual

89 mustang replaced fuel pump, relay, filter. Still fuel pump only runs when I jump the relay still no start.I heard it was important to have about ten gallons of gas only five for me, problem? It turns over just fine but wont start alot of problems with this on these cars I see need a little help please im almost frustrated to the point I dont want to look at my garage baby anymore
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Wednesday, January 14th, 2009 AT 9:30 AM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
If you are able to jump the relay, then there is power there. Are you sure you didn't get a bad ir the wrong relay? If the power is there, it should work.
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Thursday, January 15th, 2009 AT 10:46 AM
Tiny
MCNKC61
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I've tried 4 relays two from auto zone two from ford. It should still prime when I turn the key? I can't get any noise unless jumped this car just wants to stay in the garage. I checked for spark today had spark at #1. This car just does not want to start. Is it possible that there is enough fuel pressure it doesn't need to run when started, maybe I should be looking in a different direction. It turns over great I open to any suggestions at this point. There is fuel pressure in the line it squirts out from the valve when depressed. Please help this old mustang get back on the road again
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Saturday, January 17th, 2009 AT 11:16 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi:
If you are getting fuel to the injectors, there must be a problem with the injection system itself. I am going to forward this problem to a friend who is much better at fuel injection than I am. He will get back with you ASAP.

Joe
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Sunday, January 18th, 2009 AT 6:27 PM
Tiny
JNOVACK
  • EXPERT
You need to test fuel pressure in system also in the back of your car (hatch?) There is a small black grommet protecting a hole, inside that hole you can reach a reset button on your fuel pump. Maybe give that a whirl?
89 Mustang fuel relay

should be in the trunk on the drivers side, at some point Ford moved it to the fuse block at your left foot.

The fule pump relay is actually under the drive side seat. Its very unusal for a relay to go out unless you have a short some where. A commont problem in early 90 fords are relay harness connections and wiring components. Its more likley that the harness under the drive seat has a loose connection check by pulling the wires from the back of the harness lightly to see if they are loose. If they are secure and snug, trace the line under the carpet and it runs directly to the fuse box under your left foot if you are seated in the driver side chair.
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Monday, January 19th, 2009 AT 9:51 AM

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