car not starting after sitting for an hour

[tbahr]

I have a 1979 911SC European Model. I noticed recently after driving the car for some time, when I shut it off and let it sit for 45-60 minutes when I try to start it again, it will not start.

I can hear the electric fuel pump running, but the car just cranks and cranks but no sign of it kicking over (lack of spark or fuel?).

If I wait several minutes and keep trying it will eventually start.

When it is running the car seems to run normal.

Any ideas. It just started happening last month.

Thanks,

TBAHR

[Oracle]

Hi,
I've read that this can be caused by:
a) Bad seal in the fuel Pump
b) Bad fuel Accumulator
c) Fuel Inyectors leaking

There are many threads about this same topic.


Bye
-J

[davis911s]

My guess is your check valve on your fuel pump. I had to replace mine 2 years ago.
Can the check valve be replaced independently of the fuel pump?

Your symptoms are exactly what mine were. The check valve was the culprit for me, a pretty easy fix too.
Good luck
Shawn

[smestas]

What would be the difference in symptoms from a bad check valve as compared to a bad accumulator?

Yes I have searched but there seems to be conflicting information.

[RickM]

From what I've seen in other CIS cars a bad accumulator will allow a "warm" start after prolonged cranking.

[IROC]

Originally posted by smestas
What would be the difference in symptoms from a bad check valve as compared to a bad accumulator?

Well, basically there is no difference. Both problems allow the system pressure to bleed down once the engine is shut off. Now, you could (depending on where in the system you connected a pressure gauge) determine which one of these was the culprit.

The funny thing is that I have never understood how a check valve "goes bad". Does some crap get stuck under the seat and not allow it to close?

In my case it was a bad fuel accumulator. Check valve was fine.

Mike

My 79 did the same thing. It was the check valve. Many people with much more knowledge than I told the accumulater rarely goes bad.