Gas tank

[john2189]

Is it better to store a cub over winter with a full or empty gas tank to keep it from rusting?

[Slim140]

Full with some fuel stabilizer. Full keeps it from sweating.

[Stanton]

Full with some fuel stabilizer. Full keeps it from sweating.

[radioguy41]

What they said.

[john2189]

Thanks will fill them all up

[Bob McCarty]

Barnyard did that one winter and was asked to join OPEC.

[Dale Finch]

Good one, Bob!!

[Lt.Mike]

I’m a big fan of marvel mystery oil. Give it a good shot of it in the tank and drive it around to slosh it around. The marvel will leave a thin coat of oil on everything preventing rust, keeping seals from drying out and parts from sticking like the needle in the carb.

[Glen]

Hi,
Below is a page from the 1950 Cub owner's manual, with IH's storage instructions.
Notice what it says at number 8 on the page.

http://farmallcub.com/rudi_cub/www.clea ... e%2053.jpg

This page below from the owner's manual mentions filling the tank at the end of each day's use, to keep the moisture out of the tank, on the left side of the page. It does help keep moisture out of the tank. This page is near the beginning of the manual, and is talking about using the Cub.

http://farmallcub.com/rudi_cub/www.clea ... e%2007.jpg

Below is a page from the owner's manual for the newest Cubs made, mid 1975 and up.
The recommendations changed some since the older manuals.
This page was written when the more modern oils and antifreeze we have nowadays were available.

http://farmallcub.com/rudi_cub/www.clea ... age-49.jpg

[john2189]

Thanks

[John *.?-!.* cub owner]

I had (now deceased) that stored a cub for 2 years under a large lean too on the back of his storage/wood working shop. He left the gas tank half full. When I went up to help him get it started I looked in the gas tank and below the fuel level it was clean, above the fuel level the tanks was solid rust from the condensation in the tanks from the air moving in and out due to the expansion and contraction of the internal air contracting and expanding with temperature changes. The same thing happens with transmissions, resulting in an amazing amount of water in just a few years. Even ones parked inside an insulated building as mine are.

[halftonstude]

What i find interesting is what ive learned from fuel oil tanks: filling doesn't keep water out, it just prevents the water thats already in the tank from rusting the top of the tank. When a fuel tank is emptied either through use or draining, air, sometimes warm, sometimes laden with moisture, will enter the tank, and the moisture can condense during a temperature change (hot engine cooling down after being put in the shed). Temperature changes won't cycle too much air through a tank, but will cause some expansion and contraction that will draw fresh air in with fresh water vapor (read humidity). When that happens, the water vapor in the air inside the tank will turn to liquid and attach to the walls and top of the tank. Water vapor will not form where there is fuel which is down below. Filling the tank with fuel will only displace some of the water (vapor) in the tank out into the atmosphere, but the remaining water that has already condensed in the tank will "mix" with the fuel, and since water and fuel do not mix, the water will then settle to the bottom of the tank (because fuel floats), to be collected in the fuel bowl under the tank. So filling the tank will prevent fresh air and humidity from being in the tank at all, and will also cause any moisture already in the tank to settle to the bottom where it can be drained out through normal use. As soon as there's a split level in the glass bowl, drain it.
c