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Re: What is the cause?
You will have to block off the pressure and return lines to verify if the pump is the problem....luckly for me, GM has a special tool to block off fuel lines to diagnos this problem.
Look at the fuel lines under your truck, I think there is a rubber section of line between the frame and where the lines go up the back of the engine. You can clamp of the lines there to prevent the fuel from bleeding back to the pump.
Dont clamp the lines so tight you smash them, just enough to close them off.
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