ddcb7

okay so i have a 86 cherokee v6. and i have fuel, i have spark, and compression. it wont start. can it be the fuel pump? how could i test it? what other things should i test?

darknezz

just went though this in mine, when you turn the key all the way (without starting it) you should be able to hear the pump prime, should hum for a few seconds.
you have checked for fuel pressure at the raill several times after trying to start?

luckily my fix was I took off the fuel filter, which was a few months old, blew it out, took off the fuel pressure regulator and blew the line back out from the front, put it all back together and it started up after priming.

the other thing i did was after taking out the fuel filter i help my thumb on the hose from the tank and had someone crank the engine, fuel sprayed out so I knew I had pressure.

give us some more info on results.
gl

ddcb7

okay thanks, ill see if i can get to it tomorrow. thanks again!

dyegunswin

yeah check to make sure you have fuel at the return schrader valve on the fuel rail after you turn the key on to prime the system. if you do put a pressure gauge to it to check and see how much pressure is there.

Jeep_Guy

You can try to pinch off the return RUBBER fuel line at the tank if it starts then. that means your fuel presser regulator valve is bad.

darknezz

oo thats good info, where was that when i posted about my jeep not starting just a few days ago? needless to say i got it fixed by what i said above. must have been blocked filter/line, or possibly fpr was stuck or air bubbled or something weird I odnt know, but its working now so hoorah.

Jeep_Guy

ok let me know how it goes

ddcb7

oaky sweet! thanks for the info. i havnt had time to play with it, but when i do ill let you know! thanks again!