[Vwdiesel] Air in fuel lines

[David Cook]

I had the sender/pickup out when I was replacing the
two rubber lines that connect it to the fuel lines up
to the front.

Again, if I was just going to replace the whole thing,
what would potentially happen if I eleminated the
check valves?  At that point, it would be set up
essentially the same as my convertible's tank.  That
car has no check valves and is fine.  Why does the
Passat need them?

My main suspects would be either the plastic fuel line
itself, or the plastic check valves.  I suppose that
after 200,000 miles, one couldnt' be too surprised if
the plastic cracked.

Maybe I could plug the line from one end or the other
and pressureize it.  This would (hopefully) force fuel
out of the crack or pinhole that is allowing air in. 
As I said, that would make finding it a hell of a lot
easier.

David

--- LBaird119 at aol.com wrote:

> In a message dated 12/19/2006 10:19:04 PM Pacific
> Standard Time, 
> vwdieselbunny at yahoo.com writes:
> 
> > I suppose that could be a clue, though there
> didn't
> > appear to be anything on the screens on the fuel
> > pickup.  I didn't light a match to look down in
> the
> > fuel tank...  Maybe I'll use a flashlight.
> > 
> 
>   Most models actually allow you to remove the
> sender/
> pickup completely from the tank without removing the
> 
> tank.   Seems it'd be worth pulling it, plugging the
> lines and 
> putting a mitee vac to the other end and checking
> for leakage.
>   An electric pump might fix the symptom but it
> doesn't cure 
> the problem.  Eventually it would turn into a fuel
> leak.
>   Pulling the sener will make peering into the tank
> easier.
>      Loren
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David Cook
Red '86 Cabriolet Diesel Powered
Red '90 g60 Corrado 
Brown and White '78 Westy Campmobile "Bear"
and others in various states of disrepair
Pictures here: community.webshots.com/user/superdave5599

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