Sid,
I had a similar problem with my 190E. My fuel check valve was bad. I'm sure you're car has one. A very cheap part.
Randal

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1991 190E 2.3 SOLD
1972 911t 2.4 owned since 4/80 300,000+ miles SOLD
1999 C43
Merlin XLM, All Ti, 17.5lbs.