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I would start with a new battery once the cells in a battery go bad they won't hold charge so when you jump them and try to start them they aren't holding in voltage in the battery which doesn't allow the car to start. A starter pulls a lot of amp. If you don't replace the battery stalest try charging it on a low amp battery charger
You really need a garage to diagnose why. You may have insufficient fuel pressure, or the injectors may be blocked if you have been running the tank low.
But first, check this fuse in the Engine Bay
ECM ICiN
PCM/VCM Ignition, Injectors, Crank Sensor, Coil Driver Module
Check your starter and check your connections to make sure they are clean and tight. The low fuel pressure won't cause a no crank. Too low could cause a no start but not a no crank. I've had starters be bad right out of the box. But if that starter motor isn't turning either the starter motor is bad or the solenoid attached or the wiring to it is at fault.
When you turn the key on you should hear the fuel pump run if not, (fuel pump should run for 2 seconds and turn off). first thing to check is your fuel pump cut off switch which goes off in case of an accident. Next thing to check on the fuel line is find a Schrader valve to check for fuel pressure. If you have pressure you may have a different problem. If you don't have pressure or not sure hooked up a test light to the Power Supply at the fuel pump. If the light goes on you have power to the fuel pump. You may have a clogged fuel filter. If the fuel pump is still not working you may have a bad fuel pump or bad ground. Splice a wire into the ground and grounded it. If the fuel pump doesn't work pull it out and manually test it. If the fuel pump does work check all your grounds and make sure their cleaning connected to the body good. If this does not work Get a wiring diagram to figure out where the problem is. Good luck
Fuel filter, but most likely a worn out fuel pump. The engine needs 62 - 65 PSI to start the engine. Anything less then that, the engine will not start. Start with the simple and check all your fuses and then check the fuel pressure with a fuel pressure gauge connected to the shredder valve.
The valve is located on the fuel line by the distributor drivers side, if the fuel pressure is less then that. Replace the fuel pump and the wire harness from the frame to the fuel sending unit.
Thank you for using fixya and good luck.
http://gmcowners.com/gmc-forum/showthread.php?t=14509
this started happening a year or so before my fuel pump whent in my 01 blazer, the fuel pump and the sending unit for the gage are an all in one pice unit that sit's right in the tank
needs the fuel pump assembly....gauge sender is incorporated in this module...pretty expensive but the only alternative is to fill it up and reset your trip odometer each time...you should be good for 250 miles or better before next fill up!! good luck!
Sounds like low fuel pressure--replace the fuel filter. If no help, check the fuel pressure while the engine is running. You can rent the tester. For multi-port injection, the pressure should be in the 30 to 40 PSI region. Try some injector cleaner in the fuel tank. Is the check engine light on? If so, rent a scanner, check any codes, and follow where they lead.
ok, it should be a module unit. you will need to drop the tank and get the code off the top to identify correctly (ex:fci) be sure to replace the fuel filter as this usally causes the problem. be sure to release the fuel pressure and disconnect the battery or fuel pump fuse. NEVER USE A DROP LIGHT UNDER THE VEHICLE this can cause an explosion. drop the tank and remove the unit.
charging voltage to battery should be;
13.6 to 14.2 - the lower the voltage the higher the charging amps i.e:
13,6 = 55 amps
14.2 1209 amps
example only.
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