Smoke Test Fuel System- Odor, Dry Ice test looking for fuel Odor Options

[PDXBob]

I’ve replaced all of the hoses on fuel system and installed new stainless steel fuel lines from motor to fuel tank, but still getting a fuel smell in cabin of my 1975 914. I took the gas tank out last year, and it was in good shape- no rust, etc. You can sometimes smell it when standing in front of car. It’s not overwhelming, but still smells like gas.

So, I’m thinking of doing a “smoke” test using dry ice and my homemade tester (see picture). I bought a spare gas cap and installed an air hosing fitting in it. I’m planning on hooking up to my air compressor at 1-2 pounds PSI and pushing dry ice smoke through fuel system. Has anyone done this? Any suggestions or advice would be greatly appreciated.
Thx, PDXBob