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.
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I have a 95 GT that my son and I have been slowly modifying. We are about to swap our stock 20 year old auto trans with a rebuilt T5. With parts on the way, the thing will not start. One day it would not start, the next day it would, and now it will not. Clarification: the starter engages and it turns over, but it will not start. The fuel pump does not turn on or pressurize when the ignition switch is turned to "run" like it is supposed to. Here are a couple of basics we have already checked: Brand new battery with solid terminal connections (like I said, the engine turns over strong), half a tank of gas, inertia switch is set, all fuses under the dash good, all fuses in the under-the-hood fuse box good. We even replaced the started relay just to be sure. Here are some other things we have done: replaced Constant Control Relay Module (CCRM), had my mechanic friend with 30 years experience come over and check the wiring pathways: Power to CCRM good, Power out of CCRM good, Power to ECU good. At the end of about an hour, he stated that it was probably the ECU. We replaced it - still will not start. Here's the thing. The pathway to the inertia switch is good because we get a 12v reading when we send 12v to it directly through the wiring. But I only get about 1.5 or 2v when everything is buttoned up. Can a bad fuel pump cause less draw through the inertia switch? Is the fuel pumpt tied into the ignition control electronics in such a way that it will cause less than 12v to be sent to the inertia switch? I am about ready to replace the fuel pump. After replacing the CCRM, ECU, starter relay, and verifying good wiring pathways, plenty of fuel, good inertia switch and strong battery - what else could it be? Need some help on this one. Thanks.
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