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.

91 Gt fuel pump issues

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Old 01-26-2016, 09:48 PM
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Chris Dean
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Default 91 Gt fuel pump issues

I have a 91gt that was a V8 swap.
When I turn the key to run the fuel pump relay clicks but I get around 3.5 volts to the pump then when I turn key to start I get 12 volts to pump. Any ideas? ECU? Relay?
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