Hi. This is my first truck. It's been doing well, some small hang ups, but things that I have been able to fix.
Now, I'm boggled. The truck runs out of gas going up a hill. It's almost a full tank, usually about 4 gallons shy of being full. If I fill it all the way, (from a gas can), then it'll start back up. Someone said it might be a carb problem? That the floater might be stuck?
Has anyone else encountered a problem like this? It's dual tank, but I've only been using the tank in the cab, as the kid before me was only using it, and I haven't checked if the other tank is clean, etc. who knows when it was last used.
Any help, or ideas, before I start investigating?
Thanks.

 

First thing is to change your fuel filter which is in the metal can attached to your fuel pump. If a V-8, under the pump; I-6, over the pump. It probably has never been changed. Check all your rubber hoses from the inlet hose at the cap, underneath, and check your fuel pump also. With the fuel pump, check your oil level, and see if you have gas in your oil because of a bad diaphragm in the pump. Gas will dilute your oil which means you will almost have no oil. No oil means not good.

 

C4AZ-9365-B .. Corrogated Paper Cartridge Fuel Filter-fits inside metal cannister that threads onto pump (Motorcraft FG-1A).

Myriad 1964/76 FoMoCo vehicles / Available from Ford & autoparts stores. Some replacement pumps do not have a provision for the cannister, so peeps had to install inline filters.

Cannister can be a real b!tch to remove if filter hasn't been replaced in years or never...might split open. Ken at Hectors might be able to fix it, might not.

C3AZ-9355-A .. Cannister is obsolete, available from repop sellers like Mac's Antique Auto Parts/NOS from Ford Dealers, obsolete parts vendors.

 

KTmac, Also remove the fuel sender and look at the withdrawl tube and check for pinholes, cracks and the filter at the end of the tube. Kenny Nunez

 

I have had the hose from the tank to the metal line along the frame deteriorate internally and block fuel flow.
On an unknown 40 year old truck, it's best to just replace all the rubber lines. There is the one I mentioned under the cab, and then one from the steel line to the fuel pump. If it's all original, it should be a steel line from the fuel pump to the carb, but those frequently were cut to install an inline filter.

 

It is a steel line from the pump to the carb. Some of the engine is original, and other parts look like a frankenstein fix job.
Thanks for the help. I'm going to start tomorrow if the rain holds.