Quote:
Originally Posted by 83_Silberpfeil
jlex - In the procedure you describe below, when you run the fuel pump w/o starting car, where does the fuel end up? I see you mention that fuel will pass through filter. Are you disconnecting the fuel line at exit/discharge of fuel filter?
Thanks!
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The pump provides a constant pressure that is above “system pressure.” The pressure regulator (on the fuel distributor) constantly bypasses excess fuel to maintain the correct system pressure. The bypassed fuel flows back to tue tank via a “return line.” That’s why the tank has two fuel lines. By simply running the pump, you circulate the fresh fuel from the tank, through the supply lines, pump, accumulator, filter, pressure regulator and then back to the tank.