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Added a picture what is this

Where does the hose at the bottom go to?

Have you ever taken the cap off? Maybe it's some sort of fuel filter or filled with snake oil to pipe into the intake stream. Things like that were popular back then.

It would help if you posted pictures of the cap with the manufacturer's name , etc.

Ok

I'll betcha it feeds snake oil into the intake manifold to lubricate the "upper cylinders".

It looks like it could be some sort of oiler, but wouldn't be snake oil going into the intake, because it's on the wrong side of the engine. Oops - looked again. It's mounted right over the steering column.

It looks like the cap says "M&U Products San Leandro, Calif." An internet search didn't come up with anything on that, however.

I think that actually says "M&H Products San Leandro Calif"???

I tried a web search of that and came back with nothing too.

Just a wild guess, but is it possible it's a remote brake fluid reservoir that has been added to the truck???

Need to know where that line goes from the bottom of the canister???

More pictures please.

Dan

I think you're right on the M&H, Dan.

I'm leaning toward a snake oil injector of some sort.

I looked to see if the snake oil injector was made by the same company but it's not. I was surprised to see that it's a "Marvel Mystery Inverse Oiler". What a joke.

No, it isn't hooked up.

This comment should bring up some memories, I too think it is a remote brake reservoir. It did remind me of a bottle for alcohol injection for air brake systems, in freezing weather without the use of an air dryer you had to keep the condensation in the air tanks and lines ice free.

Otto, the "upper cylinder oilers" were no joke back then. During the Korea "police action" the quality of gasoline available for general use took a nosedive- - - -all the good stuff was being diverted for military aircraft fuel. Top cylinder oilers were made by the thousands to keep valve guides from seizing up due to fuel-related issues. A lot of them had a tiny copper capillary tube (1/16" OD) plumbed into the intake just below the carburetor, and there was a needle valve on the reservoir to adjust the oil flow. Some of them had 1/2 gallon glass jars for the oil. Dad sold Aviex brand top cylinder oil by the gallon to his customers. The usual metering adjustment lasted about 2K miles (one oil change) between fill-ups of the reservoir.
Jerry

Thanks Jerry.

The one on the Godfather has a half gallon glass reservoir for the Marvel Mystery oil.

Would there be any benefit to using these things today, or would it be superfluous due to the good quality gasoline we have today?

"Can't hurt"- - - - -but it's not really necessary these days. Finding inexpensive "tune-up oil" to keep the reservoir full would be a challenge. Those systems went obsolete in the late 1950's when military aircraft went to jet power and more good quality gas was released for civilian use. It would be quite a conversation starter at a car show or a swap meet, though!
Jerry

For show, you could fill the reservoir once and close the needle valve, always leaving a full oiler.

The reservoir is still filled up with MMO. It's been disconnected from the intake, though.

I would think that with modern day 10 percent corn squeezin's fuel, that a top end oiler like this couldn't be too bad of an idea. You can still buy Marvel Mystery Oil, it's a pretty useful lubricant.