This truck has an OBDII computer on board. When i turn the key to the
run position the fuel pump used to come on a build pressure in the
line for a few seconds. It has stopped doing this. When i turn the
key to the start position it turns over and grinds and grinds, no
fuel. I have replaced the fuel pump, oil pressure/fuel pressure
switch, and checked the fuel pump relay. I have also scanned the
onboard computer and it has no trouble codes. Any help would be
appreciated. Thanks in advance for anyones help.
98 gmc 5.7 fuel gauge crazy works wen in gear, trouble starting ocasionaly have to pour fuel in t.b., drive on highway @ speed and once back at idle will die, can feel power loss and regain in 2-3 min incrimints on highway ???
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Re: 1996 GMC K1500 Pickup Starting Problem
I would try a fuel filter first. the fuel gauge going crazy is most likely the sender they go bad and eventually stop working. the bummer is you have to replace the fuel module. these aftermarket are about 200 bucks. the module comes with the pump and sender which is the next part you want to look at. gm has some issues with the harness to the fuel pump externaly. it actualy will melt and start to lose conection. i would check this by visualy inspecting the plug on top of the tank. unplug it and take a look. if it is at all disscolored replace the pump (module). the new pump comes with a replacement harness (make sure its in the box)hope this helps and good luck
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have you checked for spark with vehicle off take a plug out leave it in plug wire but remove it from engine have another person turn key you should see spark from plug on valve cover hold plug close to valve cover dont hold plug hold wire part of it if you dont have spark replace coil pack or distribrator did you bleed fuel line to get air out also before you do this try replaceing fuel pump relay fuse its under hood in the fuse box it might be blown but since you said its getting fuel to rail thats not it but since you said starting fluid starts it its got to do with the fuel because its not fire because it started up so its in the fuel part replace fuel pump relay its easy to do its under hood its marked on the inside cover which one it is did yous bleed the fuel lines if not its also easy on your fuel rail underhood have another turn key but not start truck as they turn key you open bleeder screw then close screw have them turn key off have them do this a few times until you have a steady stream of fuel good luck if this helps give me a good rating if you need any more info just write me back
Hello. There may be a couple of issues here. First of all, how do you know that the car is low on gas and not almost out of gas? If you are using the fuel gage as your only source of information, I know that many older pickup gages are way off. I have one friend who runs out of gas when his gage gets to 1/2 tank. That all said, it sounds like your fuel pump is going south!
Ford has that option only.. Turn the ignition key to the ON position without starting the engine. You should hear the fuel pump operating. If not replace the engines oil pressure switch which runs the fuel pump upon turning the key to the on position. After the engines oil pressure is at operating normal oil pressure the computer shuts the circuit off the third wire from the oil pressure switch to off and turns on the fuel pumps rehay to operate the pump. I would replace both parts since the cost is inexpensive to purchase
even though parts are new they also come with defects so it sounds as if when you turn the key you hear it working and other times not at all hmmm connections are tight ? could be faulty fuel pump or relay .
Couple of things, when you turn the ignition key to the run position, you should here the fuel pump "hummmm" for roughly 2 to 5 seconds.
If you can not here the pump run, check the fuel pump fuse under the hood.
If that is OK, find the fuel pump relay in the same fuse box and swap it with another relay that looks just like it and try to start.
Also, there is a fuel pump prime wire located up near the brake master cylinder or firewall area. It is a single gray wire with a RED connector on it. If you jumper battery voltage to that wire, you can run the pump.
Good luck, let me know.
The theft light issue is a good observation. Have you replaced the key tumbler or an ignition component lately? Has there been a lightning storm close very recently?
What the flashing security light is indicating is an attempt to relearn the key you are using.
Turn the key to run position, allow light to flash for 10 minutes, when light stops flashing turn ignition to OFF position for 5 seconds, turn ignition to run position and start over. Do this for 3 consecutive cycles, the the theft system will relearn the key cylinder code and store it once again.
Try that first before you go any further.
Let me know what you find.
I see you say that you have a new fuel filter but did you try replacing the fuel pump??? If not you can check the fuel pump simply by turning the key to the ACC position (thats as far as you can turn the key WITHOUT starting the truck) listen by where you pump the gas in and try to hear a low sounding whine if you cant hear it then it could be your fuel pump is dead and needs a new one....or it might be going dead.
Take off your gas cap and have someone stand there with thier ear at the hole, (no smoking), turn the key to on just before start and they should hear the fuel pump humming. if they dont then try to start. if it doesnt start turn key off and at that instant the pump should be heard again. What i think is happening is your pump is not energizing . Its supposed to energize when turning your key on and off. This can be caused by a bad fuel pump or pump relay switch. Hope this helps. please rate me