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.

Fuel Pump

Old 12-03-2007, 02:09 AM
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phorr20
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Default Fuel Pump

My fuel pump is not turning on when I turn the key on my 88 GT.....can anybody help me out?
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Old 12-03-2007, 02:19 AM
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86 5.0L
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Default RE: Fuel Pump

check the fuel pump relay under the drivers seat, it should click when you turn the ignition to the ON position if it clicks grab a circuit test and check the connection under the car above the fuel tank

also check the inertia switch located in the trunk/cargo area
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Old 12-03-2007, 02:26 AM
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phorr20
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Default RE: Fuel Pump

Changed out the relay already.....getting no power.

Where is the inertia switch in the truck?
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Old 12-03-2007, 02:37 AM
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Default RE: Fuel Pump

Not sure why but it seems to happen when it's cold outside.
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Old 12-03-2007, 03:04 AM
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Default RE: Fuel Pump

86 5.0L......You are the man.

I went out and checked the inertia switch and pushed on the white button and the fuel pump came right on.


Thanks for your help.

Phorr20 All Day Everyday
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