CIS warm-up regulator loosing residual pressure?

Has anyone had this problem? seems like I might have a WUR that is leaking residual fuel pressure off after car is stopped.Here is my symptom: After engine is warm and left to sit for aprox 20 minutes, restarting the engine is fine but looses rpm and dies if not given throttle for about 10 seconds. If car is restarted after 5 minutes, it is ok. I have replaced the fuel pump check valve and accumulator. Could it be the WUR is not holding pressure and bleeding back to the tank after this amount of time?

the WUR does not have a check valve. there is another one in the fuel distributor. under a plug on the right side. the injectors may also be bleeding off.

[This message has been edited by john walker's workshop (edited 04-17-2001).]

This doesn't sound like vapor lock. Have you measured your residual system pressure?

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Bill Krause
'79 911SC Euro

Another way to see if you have residual pressure after 20 min, if you lack the gauge, is to push up on the sensor plate from underneath to see if you can feel any resistance. If there is resistance to the touch, them you can be sure there is residual pressure.

Joe Garcia

86 Carrera