OK ol' timers...  Over the vast stretches of time you've been rollin' yer
vanagon, how often have you had to swap out all the tank seals,
crossovertubes and whatnot.  I did it in 2001 and have found it may again
almost be time to do the nasty deed for a second time.  I had hoped that
once was enough, but...  Anyone else had to do this twice?