I recently pulled my left tank to fix a growing leak. This tank has an aerobatic flop tube, so the sender unit is mounted on the aft bulkhead of the tank. I thought the sender would be the leak source and it appears this is the case. Does anybody have a clue which sealants were used here? The black sealant around the sender is hard, but the gray sealant on the seams ranges from semi hard in the upper portions that are rarely exposed to fuel to very soft and easily moved with your finger in lower areas that are always exposed to fuel. The gray sealant is a darker gray than the recent ProSeal that was used on the access cover. The ProSeal on the access cover is hard.
The tanks are 11 years old with about 850 hours. The grey sealant appears to be holding despite its very pliable nature. The black sealant around the sender appears to be the problem. Has anybody seen this before or have a clue what the year 1999 sealants might be? I plan to have the sender opened, cleaned of sealant and ProSealed without gaskets.
The tanks are 11 years old with about 850 hours. The grey sealant appears to be holding despite its very pliable nature. The black sealant around the sender appears to be the problem. Has anybody seen this before or have a clue what the year 1999 sealants might be? I plan to have the sender opened, cleaned of sealant and ProSealed without gaskets.