I have to admit I was pretty bummed the other day. I really thought that I had a decent chance at not having the fuel float assembly leak. Maybe I'm still in the running. I had to walk away for a day to get over my funk, then worked a 24 hr shift, so I didn't go out to the shop until last night. The kids came over for Labor Day family get together. Travis is my son-in-law who happens to be an HVAC technician. As he puts it, "I chase leaks for a living" so he followed me out to the shop and we got to work.
I pumped up the tank to bout 15 cmH2O and the balloon ballooned. (That's still so weird to watch Starling's Law in action!). Travis spent about 30 seconds listening and immediately found two leaks. (I have presbycusis and even wearing hearing aids I couldn't hear a thing.) I One was the 6D nipple upon which I had attached the balloon. Although I had applied thread sealant, that didn't work as well as I thought. That got capped with the appropriate 6D cap and we repressurised. It still started dropping, but not as fast. Travis then noted that I had left the bicycle pump on the Schrader valve and pointed out that's just a friction fit and is a likely culprit, so that came off promptly. Tried again; still dropping but again dropping more slowly.
The fuel sender seal had no soap bubbles, so that made me hopeful. I soaped up the fuel filler cap and found a nice leak at the shaft that goes through the cap from the latch to the nylon lock nut on the inside. I put some thread sealant on it, but it still leaked. We called it a night and I slept much better even though I haven't proved the L tank is pressure tight.
Old trick but for those have never heard it before: Put a rubber glove inside the fill port before installing the cap. That will seal and isolate the cap.
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