Fuel pump never shuts down..?

4000 Pounds of Iron

Founding Member
Nov 6, 1999
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Nashville, TN
OK, to make matters brief, I have a 1991 Crown Vic police car that I transplanted a 1988 Mustang 5.0 HO/T5 drivetrain into. It's all stock SD for now, but I'm having trouble getting the final details together, so I figured I'd ask the experts. Look at http://www.crownvic.net/ubbthreads/postlist.php?Cat=&Board=UBB24 for details in the Vast 4k#Fe HO/T5 Swap Chronicle.

Problem #1: The fuel pump begins running as soon as the battery cable is connected, and does not shut down, ever. Is there a pressure switch of some kind that tells it when to turn off? On the other hand, it shouldn't be running at all when the key is off, and it is. When I remove power to the EEC by pulling its relay out, it shuts off. I have checked the fuel pump relay and swapped it with the AC relay and it's fine.

Problem #2: What under the hood sounds like an electric jigsaw? Whenever my clutch pedal touches the floorpan, I get a sound like that from under the hood. Since there are no switches of any kind on my custom pedal setup, I assume I'm somehow grounding something with the pedal.

Problem #3: What are the rest of the electrical connectors used for on the T5 relative to the AOD? I connected the two neutral safety switch wires, so they're out of the way, but there are other wires in the connector that I don't know about, besides the VSS on the tailshaft. Help?

Hope you all can help. If it makes any difference, my EEC is listed for a 5.0 HO TBird and not a Mustang, if anyone has a spare SD EEC lying around that they will sell cheap, please send me an Email.

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the fuel pump is running all the time because the fuel pump relay is fudged.
mine did the same thing. it should be 3 noxes on the driver side fender. one is the a/c relay one is the fpr relayt and one is egr?
replace them all they ar 5$ each new
if that doesnt do it try the ignition switch. its under the steering coloumb shroud and there are 2 screws that have no screw tips. you need pliers to get them out

im not positive but sd eec's that will work and maintain your cruis control are LSC ecu';s and mark 7
thunderbirds had ho's in em too