1992 Gmc Sierra Wont Start? No Fuel At Injectors?
In: GMC
24 Aug 2009My Dad’s 92 GMC Sierra was running rough for about a day then it shut down and would’nt start back up. It is a 4.3L Throttle body injection egine. I am used to multi port fuel injection and checking the fuel pressure on the valve on the fuel rail. When removed the air filter and had him try to start it I didnt see ANY fuel coming from the injectiors (there are 2 of them). I’m assuming it would be a fuel pump problem but I dont know much about these trucks. I listened for a fuel pump in the tank and did not hear anything.
Is the fuel pump in the tank?
Is there a fuel pressure regulator or anything else that could cause this problem?
**** The voltmeter in the truck shows slightly low voltage even with new battary.*****
Could it be the electrical signals that tell the injectors when to fire?
Coming Terms: Fuel Injectors Issues Gmc Sierra,
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7 Responses to 1992 Gmc Sierra Wont Start? No Fuel At Injectors?
Carman Nguyen
August 24th, 2009 at 2:17 pm
The fuel pump is IN the tank.
Almost never a fuel pressure regulator cause this problem.
Check for spark at ignition coil,the signal to trigger the spark is the same signal telling the injector to fire by the computer.
Get under the truck by the fuel tank,disconnect the electrical plug,use test light to see if there is battery voltage when cranking.If there is then definitely it is the fuel pump,crank the engine and at the same time,give it a sharp hit at the middle from the bottom of the tank,the vibration can give the pump motor its last spin.Many time that helps me to get the vehicle driven into the shop.
Jackie
August 24th, 2009 at 2:17 pm
First do the basics. Check your electrical, grounds, etc. if nothing is burnt, you should also check for any leaks. I would change the filter and the pump. There is also a fuel pump fuse (if blown would cause it not to work). I don’t know where the location of the pump is, I would just follow the lines to find out.
Devin
August 24th, 2009 at 2:17 pm
Fuel pump, Fuel filter mainly Id put my money towards the fuel filter its only about 15 dollars better fix it before you try to diagnose anything else
whizzy
August 24th, 2009 at 2:17 pm
Check the fuel filter then the fuel pump. I Think the pump is in the tank.
tinytrax
August 24th, 2009 at 2:17 pm
needs a fule pump or relay
WMC Jr
August 24th, 2009 at 2:17 pm
These trucks have a big problem with fuel pumps. I’ve replaced a lot of them at work, and yes they are in the tank. I doubt it’s the relay ’cause these trucks have a backup for the relay that runs off of the oil pressure switch. Fuel pressure regulators rarely go bad in these throttle bodies too. If you get the fuel pump from the dealer ask for a new fuel pump pigtail. It’s the connector that plugs into the fuel pump assembly. They often overheat from the pump pulling too many amps because of high mechanical resistance in the pump. It’s normal for the voltmeter to show low voltage when the vehicle isn’t running in these trucks too. I wouldn’t worry about that. Most likely you’ll need a new pump. Make sure you put on a new fuel filter when changing a pump. Clogged fuel filters will cause the pump to wear out fast. Good luck.
Don E
August 24th, 2009 at 2:17 pm
Fully charge the battery,check connection at oil pressure sending unit,make sure oil is up to high point on dip stick,change the fuel filter under the truck,still won`t start,consider their may be water in the distributor cap causing it not to start.Once you have made sure that’s not the problem consider changing the ignition module in the distributor.Could be a bad fuel pump relay or the pump took a dump on you.If so you will have to drop the tank and replace it.That`s all I can think of right now good luck.