The part 29 from your diagram is a tiny aluminum disk that serves as a backflow preventer for the outgoing fuel. The disk sits at rest with gravity, sealing the fuel supply from the lower housing until the outgoing fuel supply lifts it off of its seat and allows fuel to exit from the barb labeled “fuel”. If fuel tries to return to the tank, the disk is pushed back downward and seals the supply preventing backflow,
This backflow preventer system has no connection to the pressure relief valve, so it’s confusing as to why air is getting past the rubber relief seal (PN 46 on your diagram). The pressure relief valve is a simple chamber with an outlet. An overly pressurized tank pushes PN 46 upward, releasing vapor pressure by overcoming the pressure generated by the opposing spring labeled PN 44.
I can only speculate, that without the tiny disk, pressure is somehow leaking into the backside of the pressure relief valve. Once the pressure is behind the valve, it will go directly out of the opening in the upper housing, and into the atmosphere. This would have nothing to do with correct assembly of the pressure relief assembly.
Improvise-Adapt-Overcome
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This reply was modified 5 years, 7 months ago by
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This reply was modified 5 years, 7 months ago by
