[Vwdiesel] Air in fuel lines

[LBaird119 at aol.com]

  I found 3 places for air to leak into the lines on Dad's Passat TDI.
In the fuel tank a boot covering one of the lines had slipped and 
would allow air back up the return line if the check valve failed, when 
the car was off.  Not sure that it DID let air in but it sure could.  
  Second was the thermo fuel thingy on top of the filter.  The o-ring 
leaked, and it wouldn't switch the fuel back at temp like it was 
supposed to.  In cold weather it's also recirculating the air right 
along with the fuel so it takes a while to purge any air.
  Third was the clear line itself and it's been a problem on other's 
cars as well.  I found it when I bumped the crimp to the rubber 
hose.  His was leaking on the tank end rather than the pump end 
and working a bit of JB Weld into the end crip to hose area sealed 
it up.  Wiggling that hose around showed a change in bubbles before.
     Loren