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Discussion Starter #1
Every morning after sitting overnight my 01 tdi beetle is hard to start. It cranks over fine. It may take 2 or 3 trys to start. The car starts fine after the engine has been run. I think I have a fuel bleed back problem to the tank, causing air in the lines after sitting overnight. Is there a check valve somewhere in the fuel system which may cause this problem...thanks!
 

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Try inspecting the fuel tank level sensor for leaks. I think there's a check valve there but not sure. If there's no problem there the fuel leak is at the fuel filter, injection pump, or fuel return lines.
 

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I have a fuel level sender and recirculation valve on order. The injector pump is new and I had this problem before replacing the injector pump. I'll try the fuel level sender, fuel filter with new recirculation valve and O-rings....will post update later. Thanks
 

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Did it work?

I have had/am having horrible problems with air in my fuel lines on my 97 passat tdi. Hard start, smoke, losing fuel prime. Did replacing the fuel sending unit hit the mark? Any suggestions welcome. Thanks
 

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Thanks for your response. Have a new filter and went to the straight through style (older models w/o tee - no o rings). Still see problem after. Could it be a faulty/plugged pickup in the sending unit? Maybe b/c plugged pulling severe vacuum and drawing in air at connections?
 
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