Quote:
Originally Posted by Big Kev-O
Wouldn't adding the Dorman axle vent prevent the rollover valve from allowing air back in the tank? I believe axle vents are just one way valves designed to prevent pressure from building inside your axle. I assume this would cause your tank to go into vacuum as the fuel is consumed.
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The Dorman valve is basically free-flowing for exhausting pressure from the tank, and then it is restricted, but not closed, for air going into the tank as the tank is emptied. I did a VERY scientific test of this by blowing and sucking on it with my mouth. It does not close all the way in the suck direction. It has a little metal cap on it that is attached loosely. The cap pops up to let pressure out. Inbound flow causes the cap to seat down, but it only restricts the flow without stopping it. I see no particular benefit of this behavior for this application, but I don't see it as a problem. I just wanted something on the end of the vent hose that would minimize the chance of water getting into the tank.