Agreed, though it is not very often necessary at times you need to let air out so the dry pump can get a prime from the tank feed. The bleed screw is a good place to do it. With enough fuel in the tank the level gets above the high spot of the feeder tube inside the tank and then gravity alone can more easily get fuel to the dry pump so it can pump liquid like it was meant to. When the tank has been driven bone dry there is trapped air that has to go somewhere before fuel can replace it and the dry pump can't always make the 35 psi with just air to work with. It is not an air pump. The pressure regulator blocks the air from escaping to the return line until it sees that much pressure. So the pump is working against compressed air and if the back pressure is too high it sometimes can't do it unless gas has reached it since that is what it is meant to pump, not air. Mark
Max Wellhouse wrote: > On 10/31/2013 1:17 PM, Scott Daniel wrote: >> It's not neccessary to remove the screw from the fuel pressure testing >> port to bleed the fuel lines. >> It's a contiuously circulating fuel system . >> Just cycle the key several times to pre-run the fuel pump and fill the >> lines with gas. >> >> >> > > Thanks Scott. In the past(and I have lots of experience at this) > bleeding the air out of the test port screw is the ONLY way my Vanagon > will restart if I drive it dry. If I catch it RIGHT t the first > "hiccup", then I have a chance. > > DM&FS > |
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