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Old December 29th, 2017, 11:55   #6
UhOh
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Join Date: Dec 2014
Location: PNW
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No clear line... Why oh why did VW ever decide to not do that on some cars? (daughter's wagon is that way and I've been cursing this for some time now- I think I may have one on a spare IP I have)

Blockages in the tank's fuel pick-up would, as maxmoo notes, result in sucking in air and that would be visible in the clear section of the fuel line to the IP. Disconnecting the fuel line from the filter and pulling vacuum (vacuum pump/tester is essential tool) can help identify if this is the source of the problem (clogging).

Also check that the fuel return lines aren't leaking, as this will also result in air in the fuel lines (air goes into the filter, if you have the stock filter setup [which uses the thermo-tee]).
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