Interesting. So the vent on these diesels IS a check valve to let air in the tank only? Why is there so much pressure in Roberts cars, to the point of popping a return hose? Where is the pressure coming from? While driving, i'd think the vacuum created from fuel usage is greater than whatever pressure is created from fuel being returned to tank?
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Originally Posted by connerm
My tank also holds pressure. The vent is primarily for relieving vacuum, but it will release with enough pressure. However, it takes a lot of pressure before the valve activates, still its less than the tank cap obviously.
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