[T3] 71 squareback fi problem/question

[William J]

If I had to guess based on what your describe I would check  the cylinder 
head temp sensor . It's a long shot yet since the car starts after sitting 
and you say runs rough yet runs if the head temp sensor for some odd reason 
becomes an open circuit it will not start or run it's also possible that the 
connector is not making good contact since it's in a plastic cover so to 
speak that turns yellow so you cannot see the connection. Heat can cause it 
to loose contact and it's also possible the sensor itself goes open when hot 
all though I have not had one do this. You can try when this happens is make 
up a 300 ohm resister which is near what it will read when hot and either 
end to ground on the engine with a jumper lead and the other to the 
connector and see if it fires up then . The only other thing is sometimes a 
fuel line kinks or the inside of any fuel line usually near a metal fitting 
can lift in the inner wall of the line and become a sort of small flap that 
will act like a valve to stop fuel from flowing. If your fuel lines are new 
this might not be an issue unless you just changed them and somehow nicked 
the inner hose wall.
----- Original Message ----- 
From: "Birtalan, Victor" <VBirtalan at FTI-NET.COM>
To: <type3 at vwtype3.org>
Sent: Friday, August 11, 2017 4:57 PM
Subject: [T3] 71 squareback fi problem/question


>
> Hello, I have been following the current email  discussion regarding type3 
> fuel pump/
>
> check valve functionality.  During this period my 71 squareback, FI, 
> developed a problem
>
> that seems related, but not an exact match.  The problem is that after 
> driving a short
>
> distance, ie, 3-5 miles, then shutting down, I am unable to restart, 
> although I have attempted
>
> to prime the system using multiple key cycles.  I can hear the fuel pump 
> energizing when I
>
> rotate the key, however the engine will not start after multiple cranks. 
> However, if I allow
>
> the car to remain in place for several hours,  for example during the 
> course of a work day, 8 hours, it will start with one turn of the key. 
> This has me baffled since I have now been stranded a few times, but 
> luckily only in parking lots.  Once started the car runs, maybe a little 
> rough, but it will
>
> run continuously.  So, Is this a result of a problem with the check valve 
> not keeping fuel in the
>
> line for the next start, or something related to the fuel pump.  The tank 
> is vented normally, and I
>
> have attempted to start, with no luck, with the tank cap removed.  Please 
> advise if possible.
>
> Thanks,  Vic Birtalan,   Goleta, CA.
>
>
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