Maybe these guys can help: Gas Tanks - Tanks
might be a tad big but will work great Gas Tank 1 4 Turn Steel Vented Cap with Steel Filler Neck Weld on Bung | eBay
I have built a few from empty propane cylnders , I like the coleman camping size
I care fully grind/peel off the sheet metal bottom to reveal a nice round end and then cut off the threaded neck
I use a torch and brazeing rods as it flows nicely on this gauge of metal
For the fuel line nipple I use a piece of large steel brake line just drill a hole where you want it and push it thru with enough inside that it will not pick up sediment from the bottom of the tank
My trick for the fuel cap is too buy a small metal can of ABS plumbing cement
I cut the bottom out off the can and then use a hole saw to cut a clean round hole in the top of the tank
The bottomless can will slide down in with a nice snug fit and acts as a anti-slosh baffle
Braze it in and build a nice fillet around the neck , sometimes I use Jb weld as a filler to pretty it up
Drill a small vent hole in the cap and cut a gasket out of a plastic icecream lid with a offset vent hole and your good tol go
This is the only picture I can find of mine but have to buuild another soon , might do a build thread on it
I care fully grind/peel off the sheet metal bottom to reveal a nice round end and then cut off the threaded neck
I use a torch and brazeing rods as it flows nicely on this gauge of metal
For the fuel line nipple I use a piece of large steel brake line just drill a hole where you want it and push it thru with enough inside that it will not pick up sediment from the bottom of the tank
My trick for the fuel cap is too buy a small metal can of ABS plumbing cement
I cut the bottom out off the can and then use a hole saw to cut a clean round hole in the top of the tank
The bottomless can will slide down in with a nice snug fit and acts as a anti-slosh baffle
Braze it in and build a nice fillet around the neck , sometimes I use Jb weld as a filler to pretty it up
Drill a small vent hole in the cap and cut a gasket out of a plastic icecream lid with a offset vent hole and your good tol go
This is the only picture I can find of mine but have to buuild another soon , might do a build thread on it
i was going to use the top of a cheap 99cents air pump they are blue they cost about 2 buck mines broke they are metal and a scrw cap on top like this pump
http://thumbs3.ebaystatic.com/d/l225/m/mad2rRmW5yNZgH8wH9EUPfQ.jpg
http://thumbs3.ebaystatic.com/d/l225/m/mad2rRmW5yNZgH8wH9EUPfQ.jpg
i need to do more brazing. whenever i try to weld up a tank it leaks like crazy. i think the welds tend to crack when they cool. it really sucks. But for the filler necks cut out a neck from an old rusted or bad tank. theyre soldered on the base though so you need to deal with that. nice writeup Rob 