When I fill up my tank (83.5 Vanagon) with gas it
leaks out from somewhere.  It only leaks when the tank
is
FULL, & after I have driven about 25 miles, the level
drops and it leaks no more.

Could be a seal, or a plastic Y, or (very likely) a
rusted tank.  Mine was the tank.  Bus Depot has them
new.  (Thanks Ron!!!)

Not that hard of a job.  Lift wasn't needed.  I
removed the tank on the side of the road once.  You
will need one friend to help raising and lowering.
(But I did notice my tank brackets were bent a little
prior to me removing the tank.  Maybe you have to bend
these to remove it without jacking the front of the
vehicle up?  I'm sure ramps--don't forget the stands--
would also work.)

Basically, you remove the filler neck from outside the
van.  Three screws as I recall.  Then remove the five
vent lines that poke down into the gas tank from the
top.  This is the rough part.  Stick your hand over
the wheel and frame to get to them.  Next, unbolt the
three brackets underneath the van that hold the tank.
Then the tank will lower.  Be careful!  Lower it abit
and remove the fuel sensor cable.  Now it's free.  You
find the rusty area in the hump section, I'll bet.
Salty water kicked up there I suppose.

Reverse it to replace the tank.

Do yourself a favor and replace the grommets while you
are in there.  Again, thanks Ron!!!

I couldn't find an acceptable replacement tank, so I
bought new.

It's not that hard after you do it once.  The
contortion thing is the most difficult.

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