When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
5.0L (1979-1995) MustangTechnical 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.
FP will go out instantly like that sometimes. Mine in my truck just did awhile back. Check the relays and inertia switch like has done ben said. Could be the crank sensor also. Don't forget to check it.
We don't have crank sensors...........
OP, unplug the pump harness and just test the 2 wires. Each lead on each wire....
i unplugged the harness from the pump and checked the voltages with the key on, got 12.7ish volts plugged it back in. i re cycled the key and volla the pump primes, loose connection i guess. i love this car lol.