After finding the petcock screen clogged with liner flakes, I’ve just removed the flaking liner in my ‘99 Prosport tank(s) by sloshing around a cup of MEK with a few feet of fine chain to help the MEK work, and remove some fine surface rust. Took about an hour, sucked out the now liner “syrup” with a turkey baster. I decided to leave the light film of the reddish old liner remaining, like a coat of varnish, hoping the lightly rusted surface will anchor the varnish and provide some rust protection. Others may choose to remove all the old liner with more MEK. Other threads say to just leave the tank inside bare, and many will reline the tank. My method involved protecting the paint job with saran wrap and masking tape and of course plugging all tank orifices. By the way I tried to dissolve pieces of liner with methaline chloride parts cleaner, nasty stuff, had no effect on the liner flakes! MEK dissolved flakes like laquer thinner dissolves nail polish, almost instantly! I also tried the cheapo android borescope, too dark inside the tank to see much. Not much help really. I had a little trouble with the chain tangling around a steel tube inside the right-hand tank, otherwise the project went smoothly. My feeling is that possibly the factory applied the liner too thick, and/or the liner failed to stick to the new smooth steel, and/or the liner didn’t fully dry out. i blew air thru the tank with a computer fan for several days to dry the thin liner film I’d left in the tank. So far so good, nothing showing up in the new in-line filter I installed. Good luck. Squat
