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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 10-14-2010, 04:36 PM   #1
rod42g
 
Join Date: Oct 2010
Vehicle: 1990 Ford Mustang LX 5.0
Location: North Carolina
Posts: 2
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, 05:25 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, 07:57 AM   #3
rod42g
 
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Vehicle: 1990 Ford Mustang LX 5.0
Location: North Carolina
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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, 11:39 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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88 GT sold, 93GT sold, 93 lx coupe sold
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Old 10-15-2010, 11:39 AM
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1990, 50, 50lx, 89, 90, ford, forum, fox, fuel, location, mustang, pump, relay, rr, shut, upgrades

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