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cub, fuel shut off, what happened?

E

ericlb

Well-known Member
ok ive had this cub for 3 or 4 years now, the usual procedure is turn fuel on, use the tractor, shut down and turn fuel off,tractor is a dailey user as im pulling a small feed trailer with it [ old pickup bed, with 250 gallon tank in it] and mowing when i need to, yesterday same thing, but, when i went to turn the fuel off the lever wont turn, i mean its solid in place, i dont want to force it, even though i did gently experiment with a small pair of pliers,the lever will not move its solid, the nut is tight on the sediment bowl,but i can loosen the nut and the lever still wont turn, and nothing else has changed lucky so far, as it hasnt put any gas in the crankcase, yet, so whats going on here before it mess it up what do i need to do to it???
 
It will *NEVER* put gas in the crankcase.

It'll put it on the ground, but not in the crankcase. There's just no way the gas can get there. It would have to pool up in the carburetor and intake manifold several inches deep in order to reach the valves, and that just can't happen because it will leak out through the carburetor drain or any hole in the air cleaner hose.

As to why the valve seized, no idea. Sorry. Only thing I can think is maybe you galled the threads by reefing down too hard when the valve got to fully open, considering there was some wear on the threads to begin with.
 
Can not agree on not putting gas in the oil pan seen that happen to many times on too many tractors. Drained 5 gal. of gas/oil out of a 9N ford a year ago due to a bad float needle
 
I would drain the tank by removing the line at the carb and hooking up a hose to it so as to be able to put the gas in a can. Then I would pull the sediment bowl assembly off the tractor and see if maybe some rust/dirt has not gotten in the shut off area of the sediment bowl assembly keeping you from shutting it off and to take the valve off and clean it up
 
Be careful with that "never" thing. I had a first time ever experience the other day. Brother and I went to retrieve an Allis WD that sat for years in a shed. Once we had current to the coil, it fired right up. I had failed to check the oil so when it did fire up, I watched the oil pressure gauge - nothing. I fulled the dip stick out while it was running and there was a gusher out the dip stick hole. We also had little or no throttle control. Shut it down immediately. 14 qts of material in the crankcase, maybe 5 qts oil, the rest of it was gasoline. The fuel tank was bone dry. Crazy crap can happen, even if rarely. Carb float stuck down, vents and drains plugged.
 
it is of course your dime, however, if there is no other problem, i would not do anything. you could of course add an in-line cut-off should you chose to do so, this would be simple if it is a rubber type gas line.
 
I'm with Old , They sure will fill a crankcase if the air intake hoses are properly clamped .
 
Yep and that if not checked sure as heck can cost a guy $1500 plus in engine rebuild
 
ill pull it off and see what i find, i usually just open it a couple turns and run it, never fully open its got me bugged as there is no event i can chase this to as the cause, and ive never had a fuel shut off just all the sudden stop and freeze up,go to leaking yes, but never just freeze in one position, i am worried about fuel getting in the crankcase ive seen lots of them do that, and anytime the fuel tank is higher then the engine is, it can, and will fill the crankcase up with gas if float in the carb fails to shut the flow off , im living on borrowed time
 
Not trying to be funny but are you sure you turned it off the last time you used it? Don't ask why I suggested this please. Mike
 
the valve is on not off, i always turn the fuel on and off on all my old tractors, each time i use them,
 
Very true if the guy catches it before he runs it but many do not catch it before they find out about it the hard expensive way
 
I agree gas would also leak out the throttle shaft on that tractor and would also fill the aircleaner tube some but i cant see on a Cub gas getting into the engine.
 
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