[Vwdiesel] Air in the fuel line problems

[Doyt W. Echelberger]

When my 82 VW na diesel did that, I found the air getting in at a crack in 
a short section of the rubber fuel output hose where it exits the fuel tank 
before the filter. The crack was invisible until I bent the rubber hose 
about 10 degrees. The crack looked like it was made by a sharp razor blade, 
but might have been just due to aging rubber and flexing over time.

Incidentally, it took me nearly a year to find the source of the air bubbles

Doyt Echelberger
Ohio USA
 >>>>>>>>>>
At 07:35 PM 12/28/2003 -0500, you wrote:
>Hello again.
>
>This weekend I replaced the fuel filter in our 1998 Jetta TDI.  The
>problems arose soon after.  After a short start the engine died.  I simply
>was unable to start the car again; no fuel getting to the pump (almost
>discharged the battery attempting to turn it over before I noticed this).
>I took off the input fuel line at the filter and used a manual siphon to
>get fuel to that point.  Then I removed the fuel line at the pump and did
>the siphon trick again.  However, it seemed to take forever to get fuel
>through, so I started to guess a weak vacuum with the siphon.
>
>After a lot of back and forth, I managed to get the car to start and it
>seems to run fine.  However, I am observing a lot of air in the
>translucent part of the hose that connects the fuel filter output to the
>pump input (this is the middle part of the three-part hose making this
>connection).  So my question is:  Is this normal?  I am guessing that it
>isn't.  So if it isn't what should I suspect. The control valve not mating
>well with the fuel filter?  The hoses not sealing well at the connections
>(I am using screw type hose clamps).  Or something at the fuel tank end,
>introducing air there?  The only part that is observable is that middle
>translucent part of the line connecting filter to pump.
>
>If there is air being introduced in the fuel line, then would that explain
>why the pump wasn't able to pull fuel all the way on its own?
>
>The wierd thing is that the car seems to be running normally, but I really
>hadn't expect to spend 5 hours to change the fuel filter ;-).
>
>Any help would be greatly appreciated.
>
>Many thanks and Happy New Year.
>
>
>----
>Pavneet Arora
>
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