this solenoid is for returning vapours from the top of the pump into the air intake system via the 2 vent valves but also it is used to return leak off fuel from the lower chambers of the pump to the fuel tank via the return line to the leakage filter ,it is crucial to change the leakage fuel filter under the car otherwise fuel pressure builds up and overcomes this solenoid causing it to fail and return fuel in the vent valves and into the intake causing misfires too and error codes.i suggest on all 760s reaching 100k to replace the following items
fuel filter
leakage fuel filter
bulkhead solenoid
spark plugs and manifold gaskets
when the car is running if you pull off the top hose off the high pressure fuel pumps u shudnt get any fuel out .then if you remove the hose to the right on the solenoid on the bulkhead you shudnt have any fuel out either if you have fuel pulsing out of it the solenoid is faulty .
hope this helps
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