2004 Yukon XL 180,000 miles. Replaced fuel pump with new AC/Delco pump. About 1 week later, wouldn't start. Pump not turning on with key. Zero fuel pressure. Exchanged fuel pump relays still not working. Towed home and then it started. Ran good for 2 weeks, then wouldn't start. No pump on and zero fuel pressure. Replaced ignition switch. Ran good for 3-4 days. Won't start. No pump on. Zero fuel pressure. Assuming bad pump? What else could it be?
I don't know in your case with the Yukon, but something to consider is a bad cam or crank sensor, some vehicles computers shut off the fuel pump automatically as a safety measure when the sensor goes bad. When the pump is off test the sensors.
Problem fuel pressure regulator not reporting to the ECM to get power to the pump relay to run the pump
Have you checked the fuel filter by chance?
SOURCE: fuel problems 97 jimmy
Yeah, The fuel pump can go bad . The normal warranty on the pump is 12 months or 12,000 miles. This is very rare . I would check if the fuel pump had a lifetime warranty.
I would also check the ignition switch, and all the fuses to make sure the fuel pump is the failure.
Good Luck
SOURCE: 1997 GMC K1500 4x4 5.7 ex.cab SFI injection system
Did you check the fuel filter?
or possably the catalitic converter is cloged, check the exhaust pressure.
SOURCE: 1997 GMC K1500 4x4 5.7 ex.cab SFI injection system
Hey there boatright33,
A few things things immediately come to mind.
There may be a problem with the engine controller. You could check the
ODBII onboard diagnostics. Auto part stores will usually do this for
you at no cost.
When you pulled the ones that were/went bad, how did the filters look? Could there be particulate matter still in the tank causing them to fail.
I always put this one off until last. Check the injectors. Are they gummed up?
Let me know what you find out
Mike
SOURCE: will not start
Check battery voltage, clean cables. Then replace oil pressure switch. Then check/replace fuel filter. Finally add gas treatment to tank.
SOURCE: 1999 GMC Jimmy won't start.
firstly where is fuel pump relay as i have never seen a GMC jimmy sorry about that but have you ever seen a foden ?? well the first thing is to check the fuse,if fuse is ok which can be checked by looking at it as its transparent or a piece of wire with a light bulb .across the battery.to find the relay is easy if you dont know where it is,When this piece of americana decides to work just turn ignition on and listen for the click of relay ,then when it doesnt start listen for click again or rather an absence of a click,sounds more like a dodgy pump in the tank or the connections going to it.when it wont start try thumping the fuel tank with the ignition on and if it is a sticky pump you might hear it start then at least you will know where the fault is.Another fault that i have come across with relays is that where the relay is passing a heavy load then its possibe for the contacts to burn inside the relay.When this happens then if it is possible to seperate the relay cover and clean the contacts with a points file (remember them ) or a piece of fine emery paper if the cover breaks taking it apart then use a bit of black insulating tape to repair the cover.Thats assuming the pump is in the tank and not bolted to the chassis near the fuel tank but that design with external pump i havent seen on a europeon car for nearly 20yrs .
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Could be the grounding wire on the pump or the pump itself
Some vehicles computers shut off the fuel pump as a safety measure when the cam or crank sensor goes bad.
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