Fuel tank filler neck ? for J-truck

[FSJK]

Sorry for all the grade school type questions/threads, but my truck came pretty bare boned & stripped down so I'm doing all of this without experience or a good example in front of me.

My 82 J20 didn't have a bed on it when I bought it (well a wooden flat bed, but that's gone) and I got a bed out of a mid 70's truck.

My fuel tank was a tiny plastic tank from another vehicle (barely 15 gallons) so I'm switching to a carbureted XJ Cherokee 20 gallon tank. Now, the bed I'm mounting shortly only has a round fuel filler opening with nothing attached to it...and come to think of it, the inside of the bed seems to have a strange opening surrounding it (which I'll ask about later).

Most of all the J-truck fuel fillers are the square type...so, does anyone have any pictures or can you explain the setup for the round hole only filler necks?

I suppose I can post in the Parts Wanted section looking for one, but if anyone has any pictures, that would be great. The parts rig we picked up also uses the square/normal type filler so aside from just cutting that section out and cutting my bed to accept it, looking for an easier solution. Thanks!

[Tornado230]

Sent you an e-mail.

[COLOFIREMAN]

I'll show you mine if you show me yours first....


No really post up what you have so we can see what is going to be needed to make it work.

[Elliott]

Hmmm, don't recall what year they changed the filler inlet.... I'd guess '79-80.

[tgreese]

Sounds about right. Maybe '78? My '77 has the round hole in the bed side, and all the newer ones I recall have the square recess.

<edit> The parts book shows '78-on for the Gasoline Cap Protector, but the illustration says '74-79 Townside plumbing is all the same.

Without the protector, they use a fuel cap receiver in the middle of a circular flange that bolts to the side of the bed. The plumbing consists of an S-shaped hose that connects to an S-shaped pipe, and another short straight length of hose to the fuel tank. There's also the ca 1" diam glug-glug hose from the tank to a bulkhead fitting in the large S-shaped hose, up near the filler cap.

I suggest that you make the whole thing out of thin-wall metal tubing connected to the filler flange and the tank with short sections of fuel filler hose, and put a connection for the glug-glug tube in the metal tube up near the filler flange. These filler hoses are NLA AFAIK and you will have a hard time finding a good used replacement... everyone fabs their own from pipe and straignt filler hose.