there is a solenoid valve on the bulkhead just above bank2 connected into the vent line ,this goes faulty and can let fuel back into the pumps from the fuel return line from the hpfp ,when the car is running or when the intank fuel pump is running the valve is suppose to close thus only allowing vapour from the pumps to be redirected to the inlet manifold and also equalised by the carbon canister .with the car running pull the output off the solenoid and u should have no fuel out if its a good flow then solenoid is faulty ,i have a supplier that can supplu the original solenoid at a quarter of the price of bmw if needs be
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