1992 K75 fuel pressure control
Hi. I'm still trying to get my K75S running and have a question about pressure in the fuel rail. I'm taking the previous owners word that the fuel pressure was tested and found to be within specifications. Even after sitting for 2 days, when I remove the fuel line there is enough residual pressure to blow a stream of gasoline out. I know I'm missing something that should be obvious but I don't understand how the fuel pressure is controlled since the fuel return line is unrestricted in the '92 because there is no in-line regulator. It appears that when fuel enters the rail there is nothing to impede its direct return to the tank. So how is the rail pressurized? BTW, the only time it runs at all is when it's running out of fuel or the fuel line is disconnected ( for a few seconds).