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On 19 Dec 2005 at 14:32, Constantino Tobio wrote: > One of my manuals states that the relief pressure of the pump valve is > 64psi, so if both the relief valve and the regulator are in like new > condition, the route for vapor out the main ring is out the regulator > into the return, I would imagine, once the pressure in the line exceeded > 30psi. 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. 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. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~