Question about 1999 Chevrolet Silverado 1500

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The fuel pump malfunctioning

When the truck sets for a while it will not crank up, it just whines like it's going to, but when it cools down it cranks right up!

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First thing chg. fuel filter, its something thats often overlooked could be pluged up. Then do a fuel pressure test just after its warmed up and again when its cold, chk. for leak down.

Posted on Sep 29, 2009

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The fuel pump is defective you will need to replace it and the fuel sock also change the fuel filter.

Posted on Sep 29, 2009

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3 Answers

Excessive crank time on cold engine start


The way the newer systems work the engine spins at least a few turns while the computer checks everything for correct readings. In the old days it was "cool" to be able to reach in and "bump" the key and have the car start. It meant you had the car tuned perfectly. Now the vehicle computer will not turn fuel on until it is happy with readings. One trick you can try is turn key to full on position and let it sit for a second or two before turning key the rest of the way to crank. This allows the system a second to do it's checking without wasting power cranking. Had Nissan that was just like this. Just wait a few beats before turn to full crank. You can also listen for fuel pump whine in that few seconds, and then hopefully whine to stop when pressure hits full. If whine never stops fuel pump may be getting weak. If you can get access to higher end code reader you can also check for "pending" codes that may be showing up sometimes (holding start up) but then working (so engine finally fires).

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1988 buick lasabre


Nate, I'm not sure what you mean when you say,"I can get it to whine but not turn over. The starter is trying to get it to turn, but I don't think it is getting any gas".

Separate and aprt from not getting any gas is the fact( if I understande you correctly) that the motor is not being cranked by the starter motor. You say "it whines". You are referring to the starter motor, right? the starter motor should not "whine". If this is what's happening by guess is the Bendix spring in the starter motor is broken. The bendix spring is a heavy spring that is mounter on s worm gear in the starter motor. When you go to start the motor by turning the key the starter motor turn and the spring travels down this worm gear and engages tthe geared flywheel and cranks the engine. As soon as the engine starts the flywheel is now turning the bendix spring faster that the starter motor and the spring kicks back to its original position. If the spring is broken it never engages the flywheel and the engine wont crank.
The fact that you say the starter "whines" is what I would expect you to hear if the starter is at fault.

As far as no fuel flow there are 2 ifs: if you have an electric fuel pump, then there is a problem in the fuel flow. If you do not have a electric pump then the fuel pump runs off of the engines motion and since the engine is not cranking, the pump is not pumping and the fuel is not flowing.

Anything else you can add before we conclude that the starter has to come off?

Loringh


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