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Originally Posted by pberku
Your responses convinced me that an air leak is the most likely cause, but it still makes no sense. The reason I am saying that is that if the air leak is past the pre-filter than It should not make a difference how full my tank is. It should be there wether I have a full tank or not. On the other hand, if the air leak was somewhere in the vicinity of the fuel tank, than, once I start the car, it should take awhile for the air to make its way to the Injectors. Yet the condition that I described happens immediately after I start the car.
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Phil, I've been mulling over this for a bit and have the following theory:
When the tank is full, there is a slight head pressure in the fuel lines due to the height of the fuel in the tank. This pressure is sufficient to keep the air from leaking into the line at the point of the air leak. On an low tank, the head pressure drops, and more air will infuse at the location of the leak.
The time that the vehicle remains not running should also be a variable in this situation. The longer it sits with a low tank, the more pronounced the problem will be.
Roy probably has the best suggestion..........a vacuum check of the fuel lines........but, I don't know the proper procedure or tools for this.