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Jim Adney wrote: > Okay, that's the actual pressure relief valve, but that's not actually > the one > >that I'm talking about. If you note the fuel pressure checks, they tell you >that when you shut the pump off, the pressure should drop to 20 psi and hold >there. That's the one I mean, and that's the one that's affected by the little >rubber tip on the relief valve piston. That's the pressure necessary to JUST >lift the piston off its stop. > > Ah, that would make sense. Perhaps something worth looking into is to attach the pressure guage, shut off the engine, and track what it does over time. I may do that after I get the fuel loop done up. >I've never seen the 64 psi number anywhere, but that sounds about right. That >would be the pressure where the piston moves ALL the way back and allows gas to >flow straight back to the tank. > > I got that number from the "Harold T. Glenn's Volkswagen Type 3/Type 4 Fuel Injection Guide" published by the Henry Regnery Company, 1973. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~