In Bed Filler Location
 

After getting my 56 C3100 on the road last spring, realized I am just too tall (6'4") to drive comfortably. Always getting a "Charlie Horse" in my right calf after a short time. So first step- move the tank to under bed so I can move the seat back an inch or so.

Now have a tank, filler and sending unit from Brothers, and all seems straight forward enough for even me to understand. Only issue I am thinking about is how to mark for placement of the filler BEFORE drilling the hole in the bed. Yep, bed is already on and the floor is Cherry that I obtained from a local logger friend here in VT. Milled it, dadoed it so I'm pretty fond of it and don't want to screw it up!

So...

1) I am thinking I will place the tank under the frame rails temporarily mount it.

2) Then take a thin piece of cardboard and wrap around the filler tube on the tank, then pencil the circle on the floor bottom.

3) Remove the tank

4) Center drill the marked hole with 1/4" bit

5) Hole drill from the top using the 1/4" hole as the pilot guide.

6) Reinstall tank and pray it all worked.

Hopefully I have enough room for my tracing the circle from below. Pain in the Keeester, but can't think of a better way.

If anyone has done this filler neck locating with the bed already mounted, please give me your ideas!!!

Thanks for bearing with this lengthy post!

Re: In Bed Filler Location
 

being as you have just finished the bed, why don't you just take out two of your metal strips and the piece of wood where the filler goes and then mount the tank. Now you can exactly measure the location of the filler from the existing planks on either side and now drill out the filler and install it back in.
just saying

Re: In Bed Filler Location
 

That would probably be quicker in the long run than trying to figure it out from below.

Re: In Bed Filler Location
 

Always start by drilling a small hole. Then you have room to enlarge it any direction to compensate if you're off a bit.

I did mine basically the way you described and it was still off by a surprising amount. Fortunately I did the above and saved it.