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fuel pressure will bleed off due to one or more fuel injectors, or a bad fuel pump check valve.
you should check the tops of the pistons by removing the spark plugs and looking down into the cylinder with a flash light
if any piston tops are cleaner than others, then this indicates a leaking injector on that cylinder and the injector needs to be replaced
if no piston tops are clean then replace the fuel pumpPlease let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle
I confirmed No leaky injectors by removing fuel rail
Are you there?
Is there 2 pumps? 2 sending units? Does the main fuel pump itself have the check valve built in? Where's the fuel pressure regulator?
there is one pump in the tank, the check valve is in the pump
there is no stand alone pressure regulator it is built into the fuel filter
my answer was clear that if there are no leaky injectors, the pump needs to be replaced.
As the question has been answered, please kindly CLICK ON a positive rating
there is one pump and two level sensors in the tank, the check valve is in the pump
Have you personally worked on this style of system before on this model year BMW? Where is the pump located? does it have a hose coming out the top of the pump?
yes I have worked on this style of system. Yes there is a hose coming out of the pump. As I stated, the pump is in the tank. It is on the right side. As the question has been answered, please kindly CLICK ON a positive rating
I don't see a hose coming out of the right one?
the pipe comes out of the pump and runs to the filter which is also in the tank, then the fuel line runs to the engine. the pump is on the right side. As the question has been answered, please kindly CLICK ON a positive rating
Oh ok so the filter is on the left in which also has a fuel level sensor and Fuel pressure regulator built in but no check valve on the left?