The gas pump/hose keeps shutting off when I fill my tank. The problem is progressively getting worse. No Codes. Truck runs fine. I looked at the filler neck and filler hoses. They appear to be original but no obvious signs of an issue

 

Clogged or pinched vent tube for the evap system.

 

Is that the 1" hose that runs from the filler neck to the tank or is it a hose that runs to the cannister and or engine?

 

Just a guess on my part but think I would concentrate on the one going to the cannister. On my truck the evap canister is in the back . Yours could be different .Any chance you have had the bed off to work on the fuel pump? If so the hose could have been pinched on the reassembly.

 

I did have the bed off a year ago to do my hangers and shackles. Ifollowed the hose that runs front the vent at the top of the tank. It runs to a Y fitting one hose then goes to the canister over the spare tire and then other appears to run along the frame rail to the engine. I can't see any places that is crimped or crushed.

 

What year is it? You must have a restriction in the vent somewhere. sometimes spiders like to build nests in vent lines or the vent soleniod.

 

Also make sure the gas nozzle is all the way down inside the tank opening.

 

Ok so I finally got around to checking it out....I only had a few minutes but I pulled the 1"? hose off the metal filler tube and used compressed air down the rubber hose to the tank and then up the metal tube toward the cap. there is a screen in the metal tube......when i put the air down the rubber hose toward the tank gas came out of the 1" metal fill tube..........so I guess nothing is clogged in the tank or filler hoses.........(I checked and still have the problem)..the hoses were a little soft and a little flattened . I wonder if they are sucking in when I put gas in. I did not have anyone to help me pump as I looked at the hoses............does anyone know the actual sizes of the 2 hoses.........I can buy them online but I need to know the sizes.........when I have a chance I will pull the canister/evap hoses off and spray them...........all thoughts are encouraged.......TIA

*I discovered that if I hold the gas nozzle at 10:00 It works pretty good.

 

That indicates a clogged tank vent tube. Changing the position of the fill nozzle changes where the auto shut off vent (for the pump) picks up air. This indicates the vent tube (runs parallel to the fill tube to the tank) may be plugged and air is trying to come back up the fill tube.

 

Hoses are hooked up wrong, screen should be on the fill hose not the air vent hose.