73-80 gas tank... 81-87 filler neck?

[BADAZ chevy guy]

So here's the problem  The OEM gas tank in my 77 C10 has a 1-3/8" filler tube on the tank. The bed is off a 81-87 C10 with gas doors and the filler tubes are 1-3/4". Has anyone found a solution for this problem? I took a piece of radiator hose with a 1-3/8 ID and fit it between the filler hose and the tank filler tube.

[Captkaos]

Use the the correct versioned tank is the only solution.

[BADAZ chevy guy]

That's what I was afraid of. I did find a temp solution with the radiator hose bushing, but I don't like doing things that way.

[bake74]

      I have seen hose material that is a bell, I wonder if someone makes a 1 3/4" to 1 3/8" rubber bell.
      I did a quick search, I found this site, which is listed for soft wall petroleum hose.  1 3/8" inner diameter by 1 7/8" outer diameter.  Being soft wall hose, you could get a hose clamp to probably squeeze down and seal.

[hatzie]

Use the filler neck off a 78-80? 

[BADAZ chevy guy]

Use the filler neck off a 78-80?

Bed is 81-87 I need to use the hoses that fit that bed. The problem is on the tank.

[hatzie]

Use the filler neck off a 78-80?

Bed is 81-87 I need to use the hoses that fit that bed. The problem is on the tank.

The tanks run 73-81, 82-86, & 87-91.

78-81 have  doors in the bed but should have the smaller diameter filler pipes matching the 73-81 tanks.  Get the fill pipe and support pieces behind the filler doors that match your tanks.

Be alert.  The world needs more Lerts.

[BADAZ chevy guy]

Ahh. I thought it was 73-80 and 81-87. I will start looking for the mid years.
Thank you!

[hatzie]

Ahh. I thought it was 73-80 and 81-87. I will start looking for the mid years.
Thank you!

So did I. 
Lookup gas tanks for sale.  Those are the year breaks.
They only list gas tank doors from 79 on... but I've seen a 78 diesel with doors in the supposedly original bed.


From orbit on my Android.

[BADAZ chevy guy]

Okay. I talked to the place here in Salt Lake where the PO bought these tanks from. (Keystone auto) They said they may be willing to exchange the 73-81, 20-gal tanks for the 82-86 tanks. New question. I have 73-81, 20-gal tanks on the truck now. Will 82-86, 16-gal tanks mount up to the same saddles? I'm going to try to get Keystone to trade me for the smaller tanks.

[hatzie]

Why not the larger capacity?

From orbit on my Android.

[roundhouse]

Your solution is fine as long as it doesn't leak

Or you could  Take it to a good Independent (not a national chain) muffler shop or radiator shop.  Either one would be able to make you an adapter so you can get a hose that matches your fiiller and a hose that matches your tank
Cut em and splice the adapter inline

I dont see any problem using the radiator adapter rings

The little short hoses you slip over the too small neck and then Slide another hose over that


As long as they are the right size they work fine for radiators that have a lot more pressure than a gas tank is gonna have
I've used em for years and years on custom engine swaps where there are no hoses available
When you buy the universal flexible metal radiator hoses the extra rubber sleeves come with it

Yes. Eventually after several years the gasoline may weaken them   Just keep an eye on it and swap it if it
Deteriorates

Whole lot easier than swapping two tanks