Question about 1999 Chevrolet Silverado 1500

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4.3 engine will not start, but will run if gas is poured into throttle body, and keeps running.

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Try kicking the bottom of your fuel tank if it starts your pump is bad.

Posted on Jul 16, 2009

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First look for the distributor and behind the distributor is a low oil pressure switch try bypassing the switch with a jumper cable and try starting it if it runs then the oil pressure switch is bad, if not then replace fuel filter and then try again, does it start? Your done. If it still does not run turn the key on to run position with the driver side door open, listen for a 2 second hum if you do not here a hum then we can assume the pump is bad, however look at the block inside the engine compartment find the fuel relay switch, look for another solenoid like it and put into the fuel relay try starting if it starts buy a new relay, if not you will need to drop the fuel tank and remove the fuel sender unit along with the fuel pump and sock. Once you have the fuel pump out connect the wires to the pump and try running a dry start with pump out of car be sure to ground it to the frame. Turn key to run position, does pump run? Yes then replace the pump and fuel sock, if not run a wire from the positive side of the battery to the fuel pump and apply power to the positive side of the pump, does the pump run? Yes then you have a wiring problem if no then replace pump and fuel sock. Hope this helps. If not post what you find here and will replay back to you.
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Posted on Jul 14, 2009

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Check the fuel pressure at the fuel rail if 30 psi is not present it may be a bad fuel pump or fuel pressure regulator.

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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SOURCE: engine wont fire until fuel is poured in throttle body

change fuel filter.

Posted on May 05, 2009

autotherapis
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SOURCE: 99 silverado 4.3 vortec. engine turns over

put a fuel pressure gauge on it. Check my specs because I am doing this from memory but I think it has to have at least 61 psi and anything below about 55 is not enough. I once put a brand new from the dealer on my bravada. Abter it still did not start I replace the "injector spider" to the tune of 400 buck my cost for the part only to find that the brand new feul pump was not getting enough pressure. Section 4 in a haynes manual at the parts store will give you the minimum fuel pressure.

Posted on Aug 16, 2009

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Runs on the gas you pour in, or keeps running until you turn the key off ???
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I have an 1989 chevy pick up truck. The truck has an rebult 350 engine. The engine runs good and strong, but when you put the gas pedal down pretty far and fast the truck starts running very rough. ...


It sounds like you may have a bad fuel pressure regulator. The fuel pressure regulator is in the throttle body housing and the throttle body in your truck works best at 13psi to 15psi, Any other setting will cause problems. Check the vacuum hose to the fuel pressure regulator at the throttle body and check the fuel pressure at the shredder valve. The way the throttle body works is for the first 75% of the throttle, the ecm uses the signal form the O2 sensors to control the air fuel ratio and tries to keep it to 14.7:1 but at full throttle it by pass the O2 sensor signal and runs the engine richer and advances the timing so you can drive with wings like red bull. The Map sensor then takes over to promote the engine to run richer so you don't run lean and detonation occurs. If there is a problem with your throttle body position sensor, map sensor. and fuel pressure regulator, then at WOT (skinny peddle down) you may be running to rich. The other thing to is if your fuel pressure drops at WOT you'll get a lean condition and then you'll have detonation ( Knocking) and the timing will be turned down to keep detonation from occurring again and that may be the cause if your check engine light too. First and easiest thing to do is change the fuel filter and add fuel injector cleaner to you gas tank, buy a throttle body cleaner and clean your throttle body to make sure you don't have varnish build up around the throttle body, just follow the instruction on the can. Throttle body cleaner not carb cleaner. Start with that and i hope we don't have to do any more to get your truck running like a rocket. Good luck and keep me posted. Be glad to help. 

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Engine wont fire until fuel is poured in throttle body


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