hey guys ive got a weird problem yesterday after fishing im headed home and she loses massive power and drops to 800-1000 rpm. then just dies. i cant get it to start. so i pack up my fishing stuff and walk home. got my dads f-350 and towed it home. now its sitting in the garage. i can start it by spraying starter fluid in it but then it dies real quick. sometimes it will start on its own but only like every 10-15 tries. i pulled off the fuel filter and blew it out, nothing same thing. im hoping i didnt pinch a fuel line when i whent wheeling yesterday but i think it would have happend much sooner. i really dont want it to be my fuel pump. what do u guys think????

 

I think you need to chek for power to the fuel pump at Key ON. It's onl energized for 2-3 seconds....so don't blink.

Electronics 101:
If a known voltage is applied to a load and the load fails to operate, then the load is bad.

 

yup.. check your fuel pump when you turn the key on. Best way would pry be to backprobe the connector with a multimeter and have someone watch it while you turn the key on.
Can you hear the pump run when you turn the key?

 

i can hear a whining noise coming from the back when i turn the key on. im not sure what it is but i havnt noticed it before..???? xj's we hate to love them

 

check fuel pressure, did it spray fuel out for a bit when u un hooked filter

 

i dont know i clamped both ends before i took off the filter. cuz when i replaced the filter about 6 months ago it sprayed me in the face and gas in the face burns.

 

if you can hear the pump run, there could be a few different problems.
Fuel pressure, as mentioned
pickup line bad (inside the tank)
bad pump

turn the key on, wait a few seconds, turn it off wait a few seconds, repeat two more times (for a total of 3 times) On the third try, try starting the jeep. Tell us if it starts.

 

nothing..... so what does that mean?????

 

Thats a little trick people use to build up fuel pressure..
It sounds like youre not getting any fuel at all, which leaves it at a bad pump or bad pick up line.
But, just to be safe, I would still try to get a fuel pressure guage and see.

 

could i pick up a gauge at napa? or carquest? thats the only two parts stores we have up here.

 

should be able to rent one from one of those places.

Just hook it up to the shrader valve on the fuel rail, and have someone watch it while you turn the key.

 

ya neither one of them rent anything. i couldnt get coil compressors for my lift from either one. i dont want to buy a gauge just to test it out and figure out my pump is bad. that would suck to spend money to figure out i have to spend money. but i guess it is a jeep(just empty every pocket)

 

well, push in the valve with a screwdriver while someone turns the key. See if fuel squirts out (If it just trickles, you have problems. The system should have ~40 psi)

 

ok will try. and if it just trickles its a bad pump? or worse?

 

bad pump, clogged fuel pickup, bad pickup hose.
Sometimes the fuel pickup line gets a crack in it or even falls off.

Either way, you have to pull the pump out.