all i can say mark is don't drill a hole in your gastank! i.e. cut the hole
at the top of the metal riser, wher it angles to go over the engine. i
believe the float is on the drivers side of the tank, but don't quote me on
that. Maybe check out a manual that show's the position of the float on a
78'.

>My gas gauge is out on my 78' bus. 2 liter engine, 7 passenger. I know
>the gauge in the dash is fine, and I was told it was probably the float
>in the tank. I was also told the only way to get to the float was to
>remove the engine, transmission, gas tank, etc.. I was wondering if it
>was possible to nibble out a hole from the rear floor/riser behind the
>rear seat to get access to the float, replace/fix it, then seal the hole
>back up with tiger hair. Any thoughts? The main info I'd need is where
>to cut the hole, plus any other ideas...
>
>Thanks.
>
>
>Marc Bartholomew
>mb7y@andrew.cmu.edu
>retread@cmu.edu