fuel delivery problems

[tcasey1969]

my son owns a 95 xlt 4wd. It has started acting up the last month or so. what happens is in the morning he goes out and it starts and he goes to work, at lunch it wont start. no fuel pump humm nothing. wait till after work and it starts. yesterday we had the key turned on and i was messing with sensor conections and the fuel pressure humm started, it was the part that is in the air intake hose. It started like three times just fine after, about a hour later he was gonna leave and it didnt start, no humm nothing. messed with wires again and nothing. this morning went out and it started right up. what the heck. is there something im missing. any ideas?

 

[J_C]

Trace the fuel pump wires. Probe with a multimeter to find the point at which there isn't 12V anymore when there should be. Might be a bad spot on the pump motor instead.

Insulation piercing probe tips for the multimeter would make it easier to trace to the point where you can't access the wiring anymore without taking the tank off or cutting a hole in the floor panel for access, so you can verify whether power is getting that far before going to the extra effort to get at the pump and last connector at the sending unit.

 

[deweyville65]

Started having problems with my 96 on Saturday. Traced wires, checked everything I could think of, nothing helped. Sunday, went out, hit bottom of skid pkate with hammer,pump started working. Did it again this morning. Started, no start, hit skid plate, started. I am going to cut an access hole in the floor to pull the pump.

 

[tcasey1969]

thank you guys. will try above mentioned. just really need this thing to run

 

[budwich]

run a jumper wire just past the inertia switch and see if it works temporarily (of course you could put a in line switch to help with the "temporary fix").... then you can decide on the best approach there after assuming it starts / runs more predictably.