I'm about to replace the gasket on the top of my right-hand fuel expansion
tank..84 van.  I'm doing this in "camp" .   I'm not keen on trying to get
the expansion tank complety out of the van nor does disconnecting the line
to the valve seem like a good thing to try... without damaging the other
lines or wrecking the whole tank, so.... I've had the tank loose, the old
gasket/grommet...it had nothing left inside to hold it in... The
replacement.....?
   In which order should I install that?   Should I put it onto the
roll-over valve (which will still have the line from the gas tank attached)
and then the tank, or should I seat the grommet in the expansion tank and
then try to push the valve into that?  I see a potential for cracking all
those parts, which would be inconvenient...   The grommets are solar
heating as I type here.   It's about 60f ambient temperature now.   Anyone?