200q20v Digest, Vol 150, Issue 1

[Jay Kempf]

Last time that happened to me it was because the fuel pressure regulator 
was shot and stuck and the pump was working too hard to counteract and 
that right before it failed internally and started vacuuming fuel into 
the intake making it flood internally. Not fun. But an easy fix and 
actually kinda cheap part.

I suppose a block tank vent system could cause the pump to work too hard 
too. Could be as simple as mud wasps in your vent system. It is a full 
return system so surprised if it was that. Only a few things can cause 
warm start issues if it is fuel delivery: first is check valve at pump 
not closing. Second is fuel pressure regulator not closing. Third could 
be bad injector leaks I suppose. Last is just a leak anywhere either 
internally back to the tank or externally on the ground. Check rest 
pressure to find out. If you can't hold any pressure after shutting down 
then go fishing for leaks or obstructions to flow.

regards,

jfk

802 272 5868


On 5/3/2018 3:00 PM, 200q20v-request at audifans.com wrote:
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 3 May 2018 08:43:35 -0400
> From: "Eric Huppert" <ehuppert at hvc.rr.com>
> To: <quattro at audifans.com>,	<200q20v at audifans.com>
> Subject: Fuel tank pressure 200 20V
> Message-ID: <4EFFE157E2F0412D9C9D1C3B1049337A at homedesktop>
> Content-Type: text/plain;	charset="us-ascii"
>
> Last time I took this on a long trip the alternator died and had to spent
> money to get flat bedded home! Three months later I took the same trip (with
> doubts) and did make it both ways! Temps were in the low 90's and forgot
> until I tried A/C that I had unhooked compressor for the winter! Argh!
>
>   
>
> On the way home (from NYC and heat!) I stopped for coffee for about twenty
> minutes and upon starting car it just cranked. Couldn't hear if fuel pump
> was running as too much highway noise. After  a couple of attempts I floored
> pedal and it fired up. Till that point it had been running great. Also ran
> great after that. Proceeded towards home and all was fine! Got home to the
> quiet countryside and turned car off. Immediately noticed a high pitch noise
> (sounded like something electrical running). After a moment I unscrewed fuel
> cap and "whoosh", noise ceased! Tighten cap and noise resumed!!!!
>
>   
>
> Drove this car south last year in heat, no such issues!
>
>   
>
> Before I start digging in the Bentleys, any thoughts or BTDT?
>
>   
>
> Eric
>