Question about 2004 Chevrolet Tahoe

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Tahoe starts but shakes

I had the fuel pump replaced and it starts but shakes.
i was told I had sugar in the tank. what do I do.
do I have the system flushed and the fuel filter replaced or ?

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Hi, Yes that is exactly what you should do. But I gotta ask, what kind of place would replace the fuel pump, give you the sugar story and not tell you that it needed to be cleaned up or more damage may result? At the very least they should have told you that is what needed to be done when they discovered that sugar was the problem. I would TOW It. Don't run the engine anymore if it still has the fuel with the sugar. Take it someplace else and have them do the work and check that the new fuel pump was OK. Sorry for the news and Best of Luck to you!

Posted on Feb 06, 2009


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Did you have the sugar cleaned out of the gas tank? If not, you don't have electrical problems. You have fuel problems. The sugar gums up everything. The fuel pump, the filter and the injectors. Did two cars from the same family. Had to replace the fuel pumps, filters and all the injectors (couldn't even have them professionally cleaned). Cleaned out the tanks and all the fuel lines. Their insurance covered the parts and labor.

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Are you saying the filler tube is clogged? with Sugar?

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Vapor lock? That might happen in a diesel engine, but I have never seen that in a gas engine.

It is more likely there is something obstructing the flow of fuel from the tank to the pump. That is not a very long distance to travel considering the pump is in the tank. This "over-working" can cause the pump to draw too much power tripping relays/breakers.

Just because the pump was replaced doesn't mean it is not bad. An obstruction could have also damaged the new pump if it is not a manufacturing defect.

I do understand that Nissan parts are kind of expensive and I would have the pump replaced just on principle since it is probably still under warranty.

I have seen a few similar situation with residual gas tank contaminants (sugar) damaging pumps. (fluid pumps tend to burn up when they don't have a liquid to cool the internal components) No flow is very bad for the life of a pump.

Furthermore, if such vapor lock does exist and can easily be bled off by relieving pressure from the last injector in the series. (gasoline fuel injectors are different from diesel injectors, so trapped air is typically forced through the system without any priming necessary)

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Tahoe won't start

Is your security light flashing? If your Tahoe has the factory ant-theft system, if the security light is flashing while you are cranking your anti-theft system has been activated. It is common for the Tahoes to wear out the ignition lock assembly, lock cylinder and the ignition switch(electrical) which is attached to the lock assembly. I have replaced all three parts with great success and solved the no start problem on several GM trucks.

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