Starting issue after engine is warm

[milspam]

I know I've seen this problem posted before, but can't find it. Porsche 928s euro starts fine when cold, but difficult to start after driving around for a bit. Any suggestions? Any help on where to start would be appreciated. Thanks

[JhwShark]

You don't give much details.

A general known issue is a failing/failed Fuel Accumulator will cause a warm no-start condition.

[Danglerb]

Every model year had both US and Euro models, and lots change by model year.

Early CIS car nothing like L or LH.

[S4hounddog]

Check the fuel pressure regulator. Pull the vacuum hose off and check for a gasoline smell, if yes then the diaphragm is shot.

[milspam]

S4hounddog: thanks for the tip, I'll check it out. I was at work when I posted initial post and was in a hurry. The 928 in question is a 1980 Euro M28/11 engine with manual transmission. Engine always starts without any issues, but after driving a bit it does not want to start. I stopped for fuel and could not get it started without removing air cleaner filter and lightly pushing down on sensor plate. Appreciate any additional input on this matter.

[JhwShark]

While, or before, you are sniffing for gas...
check in right rear wheel forward compartment where Accumulator is for gas as well. On the '80 I do not believe you have a return line from Accumulator, and you would observe gas smell from a failed Accumulator.

[19psi]

On my '82, the problem was an inexpensive check valve on the fuel pump. Easy starts when cold but a pain in the ass even during the short amount of time to fill the tank at a gas station.

[Danglerb]

80 Euro is CIS like the US 78/79. After the major failure smelling is done, you need a set of CIS fuel gauges and a shop manual to check pressures.