The left lobe has a fuel sender and the connection that runs the siphon pump. The fuel senders give the indication of how much fuel is in the tank. So that the fuel from the left lobe can be used, a siphon pump (a one way hose that uses return line pressure) moves fuel from the left lobe to the right.. A BMW fuel pressure test requires attaching a simple fuel pressure gauge to the Schrader valve located on the engine's fuel rail. Starting the car (or turning the engine over several times if the vehicle is not running) will immediately pressurize the fuel rail and give you a reading on your gauge. Most BMW engines require a fuel pressure of 3.5 bars (51 psi), with a deviation of plus or minus.

Fuel Pressure Regulator
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The fuel pressure regulator holds fuel pressure in the system to aid in quicker starts. Like another poster mentioned above, you need to get a fuel pressure gauge and do a pressure test and residual test.. Where's my Fuel Pressure Regulator? I changed out my injectors a few weeks ago and was going to change the fuel pressure regulator but I didn't see it on my fuel rail when I replaced the injectors. I read somewhere that some cars have them on the fuel pump itself. Is this correct or am I just missing it? Reply With Quote 06-11-2020,04:51 AM #2.