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Fuel starvation problem: why do fuel pumps get noisy?
I was enjoying an early morning drive this past weekend when my car (71 911T with '83 Euro 3.0 motor) started to buck and sputter. Initially I thought I was running out of gas, but the end never came. The car would still run, but didn't generate enough power to get me home. I pulled out the sending unit, inspected the tank (still plenty of fuel, no sediment or debris in tank) and everything looked fine. The hoses looked fine, no kinks.
After sitting for a few minutes, I fired up the car -- it ran better and got me home. The fuel pump is really noisy -- which I know suggests iminent failure. (But the pump should, theoretically, be good -- I just got it from EZ two weeks ago.)
So here's the question: How do I figure out whether the pump or the in-bound fuel lines are the culprit? I don't want to get a new pump just to burn it up, if the real problem is a partially clogged fuel line. Unfortunately, I don't know what flow rate from the tank to the pump is appropriate. (THe pump is located in the rear, where the second pump is on the turbo.)
Any of your ideas would be greatly appreciated! Great forum.
Jamie
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