Author Topic: Air in Fuel lines  (Read 2065 times)

October 28, 2007, 03:56:24 am

Henchman

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Air in Fuel lines
« on: October 28, 2007, 03:56:24 am »
HI all,

I have air in my fuel lines.  Replace filter, all small hoses and clamps in engine bay and connections at tank seem fine.  It seems to get better, even go away when engine is warm/hot, but as soon as I turn off engine, bubbles start feeding back up into feed line.  Is the leak in the pump?  Is there a simple fix or is it a rebuild sort of issue?

Thanks all,

Ian
Under way - 1991 Passat Syncro Wagon w/m-tdi

1991 Passat GL Wagon w/AAZ conversion (now using engine/tranny from 1993 Passat

1993 Passat GL 1.9 Diesel (RIP 385k km, engine, tranny, clutch all original)

Reply #1October 30, 2007, 11:55:30 am

92Wolfsburg

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Air in Fuel lines
« Reply #1 on: October 30, 2007, 11:55:30 am »
Fill a small container with clean diesel and run the pump straight from that. Did a new rubber o-ring come with your filter (if you're running the heated filter)?

Reply #2October 30, 2007, 01:45:15 pm

rov716y

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Air in Fuel lines
« Reply #2 on: October 30, 2007, 01:45:15 pm »
sounds like you have a corroded metal fuel hose with a pin prick in when the engine stop air leaks in and fuel leaks out check to see if you leaving small amounts of diesel behind you when you been parked

Reply #3October 31, 2007, 05:02:01 pm

Henchman

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Air in Fuel lines
« Reply #3 on: October 31, 2007, 05:02:01 pm »
Thanks for the replies.  My fuel lines appear to be plastic/rubber from the tank to the pump from what I can see, and I have already replaced all lines and clamps in engine bay.  I will use the jar of diesel tip, but I am pretty sure it will confirm that the leak is in or around the pump.  Any common issues like this?  And my filter came with a new seal.

Thanks,

Ian
Under way - 1991 Passat Syncro Wagon w/m-tdi

1991 Passat GL Wagon w/AAZ conversion (now using engine/tranny from 1993 Passat

1993 Passat GL 1.9 Diesel (RIP 385k km, engine, tranny, clutch all original)