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The typical reason to lose oil into the filer box, is that the engine has been tipped up, this allows engine oil to travel down the breather tube and into the back of the box, the other reasons are, engine worn, or the engine breather itself is faulty.
There is no breather hose for the fuel tank, the system is designed as a sealed system to prevent gas fumes from polluting the air it is called the "Evaporative emissions control system", and yes some systems can have alot of pressure in the tank esp on hot days or after a long drive.
It's possible that you may have either a clogged breather box or broken breather box hose. The breather box is located under the intake manifold. It is sometimes also called an oil trap.
common problems that can cause this is to much oil. engine veins blocked or the rings on the piston are gone and the back pressure from ignition creates an overflow of air into the system.
That will be the engine breather hose. There should be no oil in the hose, if there's oil then it surely is an engine issue. The piston rings surely is bout to go so be ready for replacement soon to resolve the issue.
Hope this helps and thank you for using FixYa! Have a good one!
Has the oil been changed lately? A lot of times over filling the oil will cause oil to blow back thru the carburetor, Also if the air filter got caked with mud running the box with no lid or allot of dirt in the filter. The engine will try to use the crankcase breather hose as an air intake since not enough air was coming in the conventional way, therefore sucking in oil. Has it smoked at all? Sometimes if you try to shut it off oil will run back down the intake tubes into the air box. This may be applicable to your engine that the breather is being used to **** oil into the box due to lack of fresh air intake. The other possibilities would be crank case pressure pushing the oil in (piston ring blow by), but that should (theoretically) result in low compression (since the cylinder pressure is getting to the crankcase instead of staying in the cylinder), the oil is overfull and being pushed out since air will compress but liquid will not, or poor crank case ventilation system design (but if that were the case likely there would be a recall as that would directly effect emissions which is federally regulated).
REPLACE THE CRANKCASE BREATHER ON THE SIDE OF THE BLOCK. IT IS A SMALL RECTANGULAR SHAPED BOX AT THE END OF THE HOSE THAT IS ATTACHED TO THE AIR CLEANER HOUSING WHERE THE OIL IS SPRAYING IN
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