the later tank fits in just fine.
You 'should' have the better smaller plastic filler neck on both.
In any case, the smaller plastic filler neck is WAY easier to work on, and
you want that installed for sure.

the only other difference is in the fuel out let pipe size.
right where it goes to the fuel pump.
if the two tanks are different there you might have to do a little
adaptation , but no big deal.

I regard vanagon fuel tanks are pretty non-serviceable.

I've looked in ones that seemed restricted...and tank looked real clean
inside.
the fuel is picked up in a sump area in the middle of the tank ....an area
you never work on or access without opening up the tank.

'back when' radiator shops worked on metal fuel tanks..
my diesel vanagon tank would  stop delivering fuel at about 1/4 tank..
and I *knew* that tank was the problem because the van ran fine off the aux
tank on board.

I took that vanagon tank to my radiator shop.
they didn't think there was anything really wrong with it, until finally
after about two months of doing nothing, they cut the bottom open where the
sump area is - yup, all cruded up in there they sheepishly admitted.

but normally .....on vanagon 2WD fuel tanks...they either work or they
don't,..
pretty non-serviceable other than fuel treatments, blowing out etc. ....and
you can't get to the area where they get clogged, not normally anyway.
Scott
www.turbovans.com

----- Original Message -----
From: "Jeff Lincoln" <magikvw@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, June 04, 2010 9:40 AM
Subject: Operation Gas Tank: '90 into an '85

> OK gang her's the scoop. I know that the tank on Gertie (the '85) needs to
> be dropped and a resealed. However, I also think the tank is full of crud.
> So I have a couple of ideas
>
> 1. A new tnak (I don't have the cash right now)
> 2. Steal the tank from Grover (the '90) and put it in Gertie
>
> So aside from the tank outlet being a different diameter are there any
> other
> differences I should expect? Filler tube size? Anything?
>
> Also, I'd greatly appreciate any suggestions or advice on how one might
> clean a tank of crud once the tank is freed from the bus. I mean are there
> any particular solvents or cleaners to use?
>
>
> --
> Thanks,
>
> Jeff
> '85 GL (Gertie)
> '90 Carat (Grover - the noble parts donor)
> '86 (We call this one Scrap)
> '78 Bus (Melissa) Patty's Bus