89 mustang gt fuel problems - Mustang Evolution

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Old 07-27-2014, 04:35 PM   #1
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89 mustang gt fuel problems

I have a 89 mustang gt in the middle of the engine change. the problem i am having is that i replace the fuel pump relay under the seat and the only way the pump will cut on is the by pass the relay. even when bypassing the relay the fuel goes in the lines but nothing works with the injectors. i know i have more than one problem and at the point i am looking for help on what to try or look for so i can finish this project up. not sure where grounds are located at. thank you for anything in advance that could help me.
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Old 07-27-2014, 05:03 PM   #2
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In the trunk inbetween the tail lights there is a inertia switch try pushing the button on it it will kill power to fuel system if it gets hit or messed with I had it happen to me before

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Old 07-28-2014, 06:42 AM   #3
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I tried that.replace the relay under the seat .only way to get the fuel pump to cut on is to use a jumper wire in the relay then it run.which it a good way to burn it up. But even the the injectors are not working either. When I got this car there was not engine or Trans or harness in the engine bay. Not sure if I am missing a ground or something. I even tried a ground from body to block. Everything was working when I took it out of the other car to put it in this car. Just not sure what I am over looking

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