Ford Mustang 1990 5.0 LX Shutting Off..Fuel Pump? - MustangForums.com



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Old 10-14-2010, 03:36 PM   #1
rod42g
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Default Ford Mustang 1990 5.0 LX Shutting Off..Fuel Pump?

I have a 90 LX 5.0 and when I crank it it shuts off after a little while. I think it may be fuel pump related. I have a relay under the driver's seat that I was told was a fuel pump relay. Replaced it. It still chatters when the car is about to shut off. I was troubleshooting under the hood, and another relay on the passenger wall was chattering also. Is this another fuel pump relay? I have not replaced it yet because I don't know if it will solve my problem or what relay it actually is. Should I just replace the pump itself? Has anyone had this problem with their Mustang? Help.....
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Old 10-14-2010, 04:25 PM   #2
enix187
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so when you crank it it'll fun for a few seconds and then shutoff
no fuel condition

read this (the no fuel part)
http://www.stangnet.com/mustang-foru...-off-coil.html
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Old 10-15-2010, 06:57 AM   #3
rod42g
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Default Fuel Pump Problems

When I first noticed the problem the fuel pump stayed on even after I switched the car off. I had to disconnect the battery to shut it off. Now it doesn't do that anymore. Now after I crank it runs about three to five minutes. It start to make a weird noise under the hood, and the relay under the driver seat chatters and the one under the hood on the passenger side.
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Old 10-15-2010, 10:39 AM   #4
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just start running the diagnostic checks listed there, it gives you a good idea of where everything is thats important for the fuel system. Also see if you can't borrow a fuel pressure tester to see what your fuel pressure is doing as it shuts off.
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