I have a 1984 GTi Rabbit.
For the past month or so the car is difficult to start after it sits an hour
or more. What happens is that the car starts right away and then dies after
5 seconds or so. It will start right up again and then after a few seconds
die. If I start it with my foot on the pedal and have it rev at 2000rpm and
hold it there for 1 minute I can release the pedal and the car will run
fine. I can start and stop it fine, if the car sits for more then about an
hour I am back to the problem. Temperature doesn't seem to affect it.
I think I am losing fuel pressure. I went to change the fuel filter in the
morning after the car sat overnight. When I went to loosen the banjo bolt
on the output side of the fuel filter the fuel didn't spray as I loosened
the banjo bolt. This tells me that the system was not under pressure. I
noticed that the output side banjo bolt has a little spring in it is this a
Now I have to narrow down where am I losing pressure: fuel accumulator?
Leaky injectors? Cold start valve?
Is there a way to narrow down and divide the system? If there was no
pressure at the fuel filter does that mean that the leak could be before or
after the fuel distributor?
About a week ago I pulled the car into the driveway, the car was cold but
the fuel system was under pressure. I had a spare warm up pressure
regulator so I decided to swap it. When I went to loosen the lines at the
warm up pressure regulator the fuel was under pressure and gas sprayed out
as expected. I did however notice when I put the spare fuel accumulator in
that the car started up pretty much right away. I am just trying to use
this in my troubleshooting logic, that the fuel pressure got back up pretty
fast after losing pressure at the warm-up regulator.
This is what I think is going on:
My fuel accumulator is leaky. And after it sits for a while, fuel pressure
drops as fuel goes back into the tank. However there is fuel pressure up on
the fuel distributor side that is why the car starts right away, but then
dies as the fuel pump has the bring the capacity of the system back up as
pressure has dropped from the accumulator to the fuel filter / fuel
sorry for the rambling.