Author Topic: 89 GT fuel problem  (Read 4414 times)


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  • Posts: 1
  • Gender: Male
  • Mustang: 89 GT Convertible
89 GT fuel problem
« on: June 03, 2012, 01:14:36 PM »
I have a Convertible 89 GT 5-speed that won't start in hot weather. When I turn the key on the fuel pump will not run. I have replaced the fuel pump relay, ecm relay, had the ecm rebuilt, and replaced the module on the side of the distributor, all on the advice of different mechanics, nothing helped. It seems to be losing the ground when it gets hot. Has anyone else had this problem or have an idea what to look for? Any help will be greatly appreciated.  Thanks.


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  • Posts: 2
  • Gender: Male
  • Mustang: 1991 5.0LX Convertible
  • Daily driver: My Mustang
  • Location: Pocatello, ID
Re: 89 GT fuel problem
« Reply #1 on: August 11, 2016, 05:27:16 PM »
I had a similar problem with my '91 LX convertible. It would run perfectly fine on a cold start, but any time I got the engine to Temp, the fuel pump would quit priming. I ended up chasing the problem directly to the pump itself, and that fixed the issue right away. I have no cold or hot start problems. I work at a shop and we diagnosed the problem as the pump failing and it was getting too hot, and basically shutting itself down until it cooled off enough to work again. Let me know if you find out any other problems you're having and if this fixes the problem. You can get a cheap stock replacement Fuel Pump from, which is where I purchased mine from, at about $25. Email me anytime for questions



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