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1993 Ford Mustang fuel pump constantly runs

Tiny
STANGLX93
  • MEMBER
  • 1993 FORD MUSTANG
  • V8
  • 2WD
  • MANUAL
  • 113,000 MILES
I have a 1993 mustang 5.0 I recently got into computer tunng well I plugged my tuning chip in with key on, into the j3 port, and now even with the tuning chip out of the ecm the fuel pump constatly runs when key is on, once the key is off it stops, I suspect the fuel pump relay is stuck open, but is it possible I fried somthing in the ecm when I plugged the chip in with the key on engine not running
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Saturday, October 4th, 2008 AT 3:43 PM

4 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
I would be checking the relay, the chip shouldnt have friend it you m ay have damaged the computer or its just time for the relay to stick.
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Saturday, October 4th, 2008 AT 5:42 PM
Tiny
ATZET
  • MEMBER
  • 4 POSTS
I have the same problem. Car wont start. Pump stays running.I have no pulse to the injectors.I think its the ecu. Let me know if it fixes your problem

gary
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Thursday, October 9th, 2008 AT 7:04 PM
Tiny
STANGLX93
  • MEMBER
  • 1 POST
Well it turns out it was the ECU when I was trying to tune my car, I plugged my interface into the J3 port on the ECU while it was powered up so it fried what I believe is the fuel control and whatever else so $148.00 later the problem was fixed, sorry to be the bearer of bad news
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Friday, October 10th, 2008 AT 1:28 AM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Sorry to hear thats what it is.

That tuning stuff can be tricky business.
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Friday, October 10th, 2008 AT 8:30 AM

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