I checked fuse & it's good, checked relay & its good, fuel pump works when attached to power source. I can even start truck when outside power source is hooked up. When I plug fuel pump in won't start. I am at a loss as to what to look for next. Please help, any suggestion would be appriciated. Thanks
Your doing the tests wrong (best I can tell)
most cars for sure USA.
the pump only runs key on for 1 or 3 seconds,called the injector PRIMING state. (keyed on only not cranked) and then....
and for sure the same relay closes full time , cranking or running.
so on dead engine all techs know this and crank at the same time measure the 2 power pins to the pump.
in your case it fails. I bet but that is the only test here.
next is the relay, most have 4 pins as yours does.
.
the PCM energizes the relay pump if you crank the starter
I can only assume cranking works all good?????
these rules in the PCM prevents crash and burn, like Ms Heche(RIP). did.
crash ,engine stalls and pump goes off line and not a huge fire. from broken fuel lines, and is USA law too this. safety
on some cars fuel relay goes off one if spark is lost and for sure injectors are shut down spark seen dead. all this is pure PCM logic. deep inside..
all this is covered in ASE classes to techs. how all this works
it's home users (DIY guys that do no know this ) so here is my lil' hints. late.
it does not work like say a swimming pool pump.sorry
2.2L engine.
oops this 2.2 L puppy has oil pressure switch that kills the pump fast after a short run of he engine, saving it.
all fuses must be good, top PCM too, f9/10
and check engine light good must glow key on or PCM is dead
the ecu enables fuel pump relay first. then oil pressure good susains the fuel pump relay.
so PCM F6 dark green/white wire is what energizes the FP relay coil.
if pump is dead (voltage dead) to pump cranking , no longer than 10seonds(not overheating starter)
and fall fuses are good. all as in ALL.
F6 wire at ECU/PCM is check next or at FP relay.
check all pins of FP relay for correct voltage cranked (dead engine STARTER Good)
and be fully aware of all ways the PCU will shut down the FP relay
not saying I know them all , it is Firmware logic in the PCM.
better photo here.
https://imgur.com/a/rB4j125
Look for wiring diagram. My s-10 1995 had same problem. 3 orange wire's that attached together. Out of like 40.
It might be broken wire have test the wires with a meter or test light
SOURCE: can't find relay for parking light switch
i need help finding my parking light relay on my 1997 chrysler sebring lx
SOURCE: fuel pump relay hot
You could have a loose connection going to the relay. Loose or bad connections cause amperage to rise causing heat to rise. Check the plug holes where the relay pins plug in. Check for blackened metal or melting plastic around the pins. If so, check under the relay box for burnt wires, etc. and repair.
SOURCE: truck won't start. engine turns over. checked
have someone to stand back by the truck why you turn the key to listen to hear if there is noise coming from the gas tank if it is then its not the pump then it maybe your fuel pump relay or the crank sensor give these websites a try www.alldatadiy.com and www.autozone.com wish you the best of luck Michigan Man.
SOURCE: 1995 s10 pickup 4wd just replaced fuel pump, won't start.
replace the wireing harnes to the fuel pump gm had problems with them cost around $15 to 26 at autozone
SOURCE: no spark no fuel no start! replaced and checked
funny thing is I have a 2002 GTI with the exact same problem. have spent the last three days at work trying to figure things out.. best of luckn email me if you figure anything out. [email protected]
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