another blazer tank question (fill hose)

[19GMC63]

OK, so I have my poly blazer tank mounted, gas lines ran and working, and I have a 1 1/2" marine type cap installed on the rear fender. I bought a 1-1/2" filler hose on ebay, only to find the tank neck is actually 1/8" smaller at 1-3/8".... great.

My first though was to find a 1 3/8" hose.... must be an odd size cause I cannot find it anywhere! So I really just need to rig the filler neck so I can use the 1-1/2" hose I already have. I've noticed the guys using the metal tanks weld on an exhaust reducer and call it a day, but with the poly tank, I don't have that convenience. Only thing I can think of is slipping on some sch 40 pvc and epoxying it to the neck, but that seems like something the redneck PO I bought the truck off of would do.

So to my question, anyone know of a reliable way to make this oversized hose work?

[Fred T]

We used to use radiator hose. But today's rad hose swells when used as gas hose. The plastic pipe won't be the right size, it goes from 1-1/4 to 1-1/2 inside diameter. No 1-3/8.

I'm not sure what to recommend. If you can get some exhaust pipe the right size, it could be used as a spacer on the filler neck tube and the tank. Don't forget, steel tubing can be expanded, but it takes some work. A muffler shop could be a big help here. I would either take the parts to them or measure with calipers, you want a fit thae will barely slip over.

Instead of epoxy, I would use Permatex Hylomar sealant. It is gasoline resistant, developed by Rolls-Royce for sealing carburetors. It also remains flexible, you can take things apart later. I have been using it on any rubber fuel line connection.

[19GMC63]

thanks for the suggestions.
It seems steel tubing would be my best bet.

The only other thing I could think of (I know it probably sounds very redneck)... was taking a neck length of that 1-1/2" hose, slitting it and trimming off a bit so I can use it as a spacer, glob on some of that Hylomar HPF sealant, clamp her down with some heavy duty wide band clamps, and hope for the best.

I have the bed wood out so if anything I do does leak, it's easily accessible.

Any other suggestions? Also, feel free to tell me my cunning plan is a no no.

[sailed2japan]

I've found 1 1/4" fuel hose available from marine supply stores online. I just stretch it over and clamp it down.