drop in fuel line pressure on shutdown
munrof at sympatico.ca
munrof at sympatico.ca
Wed Nov 14 22:50:19 EST 2001
Hi George:
How do you know the check valve is good? The test for the check valve is fuel line pressure retention - if it drops rapidly, the check valve is assumed to be bad. I had a brand new check valve installed in my old '86 5ktq that was bad right off the shelf.
The only other source of leak-down I can think of is leaking injectors, but I'd try another check valve first.
Fred Munro
'94 S4
>
> From: "George Kotjarapgolus" <gkot at adelphia.net>
> Date: 2001/11/14 Wed PM 12:37:20 EST
> To: "Quattro Digest" <quattro at audifans.com>
> Subject: drop in fuel line pressure on shutdown
>
> 1989 200 turbo engine: Car symtoms are that it will not start once engine is
> warm. Can start it however by spraying starting ether, but only with
> protracted cranking. Cold start has not been a problem.
>
> My mechanic concluded it was a vapor lock problem. Fuel injector fan is
> working, it's sensor is also working. Problem seems to be compounded by a
> rapid drop in fuel line pressure on shut down which supposedly hastens onset
> of vapor lock problem. Fuel tank check valve is good. Put on a used fuel
> distributor but pressure still drops rapidly on shut down. What is between
> the fuel distributor and check value that would be causing rapid drop in
> fuel line pressure??
> Help
>
> George Kotjarapoglus
>
>
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