5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
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My fuel pump won't turn on when I turn the key to the on position. I have researched the fp relay and replaced, replaced the fp and the solenoid and fixed the gr/yl wire which changes to or/bl before getting to the solenoid. The previous owner rigged the pk/bk wire coming out of the fp relay to have constant power through the fuse panel, this caused my fp to run constantly and to prime constantly. I put the pk/bk wire back where it was suppose to go but now I don't know where the pk/bk wire goes. I think it goes to the ignition switch but not 100% sure. I have pics of what I'm talking about. Any help would be appreciated
Thanks for the responses. I have actually taken the dash off at this point. Not only because of this issue but I have to do a heater core replacement, alarm system removal, just seeing what the h3ll others have done, etc. The most recent discovery is the lack on connectivity between the pin 19 wire (pk/bk) at the EEC and the wire at the fuel pump relay also pk/bk. Is there a fuse, fuse link, connector etc between the EEC and the quick connect that is behind the fuse panel on the drivers side?
Bubba 95SN, I already looked at those diagrams, and multiple others, none show what I wanted to know, hence the second question. Either way, I've test multiple options and now am at a lose. The only two things not replaced at this point are the grounds for the vehicle and the EEC. These are the only two options left. My EEC is giving 6 volts when the key is in the ON position. It has 7 volts when the engine is on. I have tested the grounds at the solenoid, under the EEC, block to frame, and a couple of others, all are tight, any appearances that looked shady to me, such as a junk splice have been redone so I've all but ruled out ground issues. If the EEC is bad I would think pin 19 would get no volts and other things would be wrong with the vehicle. Any suggestions, rumors, outbursts, etc???
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