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Are you sure that it's starving? The only way to tell is to check fuel pressure while driving. Buy a pressure/vac gauge, hook it up with long hoses, and tape it to the back window. Look at it thru the RV mirror and see what's happening.
Then check volume. How many GPM is the pump delivering ?
Might have to rebuild that pump. There is a correct procedure to rebuild the Porsche and early VW pumps. You must preload the diaphram before screwing the 2 half's together. The spec should be in the repair manual.
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