Question about 2004 Chevrolet Silverado 3500

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Have spark, pulse, fuel pres, but the motor wont start. when i prime the injectors it runs for 5 sec the stalls out. what else can it be?

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My brother has a 2004 chevy silverado 4 wheel drive and awhile back it would stall when the tank got low. He took the tank off and it was clean. He said he would just keep the tank from getting low. Now it appears to be doing the same thing even when the tank is almost full. Any ideas? thanks.

Posted on Sep 08, 2010

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Could be the fuel pump is not getting signal in the run position

Posted on Aug 03, 2010

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With intermittent issues, have to test when problem is ongoing. How long since a tune-up?
If it cranks good but won't start, have a helper crank it while you check for spark at the plugs, if spark everywhere, use a gage and check proper fuel pressure. Also, check fuel injector pulse. If your missing all three, check for rpm signal, comes from crank sensor.
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run the fault codes and check for problem ECM
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filling the filters before installing will make priming go more quickly.
once the pump is primed crack open the fuse line at the injector while cranking until you have fuel pulsing out, close it then move on to the next injector.
keep doing this until the engine runs smoothly.
it may start running before all the injectors have been purged so keep clear of all moving parts and a fire extinguisher handy would be a good idea.

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I saw what you replaced, didn't see any testing?
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Need to check to see if the fuel pump makes noise in the gas tank (humming when the key is cycled (aka priming the pump)) or check for fuel pressure at the rail with a fuel pressure gauge. Check if you have injector pulse when trying to start the car (purchase the correct noid light for your GM and see if it lights up when you try to start the car).
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Since it sounds like you also carried over the OBD2 connector, do you have access to an OBD2 scan tool with datastream mode? If so, you should be able to monitor various sensors to see if that offers a clue as to why it stalls. When it just spins over have you checked for spark, fuel, and injector pulse width?

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