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I was able to leak test the installed pilot gas tank with air saving a great deal of grief.
I capped vent tube with rubber cap and clamp, pressure gauge in fuel line and air hose in fuel return line.
The gas cap was sealed with double sheet of saran wrap.
The pressure was 2-3 PSI and the tank was installed and gas tank skin was clecoed closed.
It was much easier than disassembly and bench testing with gas.
The tank needed to be installed for this because otherwise the unsupported tank would balloon out without support.
I don't take credit for this but got it from a friend who was trying to keep me from blowing myself up with gasoline fumes.