Hi there,I have just spent half an hour searching my 940,740 and 240 manuals and it doesn't cover the fuel pressure valve except to say expect some fuel leakage when disconnecting it.
I would imagine that if the diaphram was leaking then the smell of petrol would be quite strong.The pressures involved in operating the valve are quite high so this would account for the running rich.
I'll keep looking,Regards Brian.
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