John Deere 180 fuel system

ArkyBass

New User
Doing a simple fuel filter install. Wanting to turn the gas flow off so I've turned the little valve on top of the gas tank full left and full right, neither seems to turn off the gas. This valve has a aluminum knob about the size of a dime on it.

I had the engine running during the 'turn off' thinking it would run itself out of gas. Is this not the fuel shut off? If not what is it?
 
It will take a while to run out of gas after you turn it off, just cut the line and put the filter on. You might loose a thimble full of gas.
 
Depending on length of fuel line between carb and shutoff these engines can run 5-10 minutes with the shutoff closed. Especially if its just running with no load on it. Engine rpm is a factor as well. If you close the choke when it starts to stumble you can often squeeze another 30 seconds of run time from it.

You can get a pair of plastic locking pliers that are made to pinch a rubber fuel line closed as well if you suspect the shutoff valve is not working. I have a few pair of them for applications that dont have shutoffs. Harbor freight used to have them, maybe they still do. But I am sure they can be found from other tool suppliers.
 
Thanks for the replies. I'm going try the valve again this time letting JD180 run longer andor drivemow with it till it empties the line.

I let the gas go old over the winter and had to unstop the fuel filter to get it running. I took filter off and blew backward though it and got it running. While doing that I drained 1/8 gallon into a can pretty quickly. Not wanting do do that again, I thought the valve would be handy if it worked as designed. The pliers and clamps are good ideas in a pinch :?

I've mowed twice with it (same gas). It's not starting very well so I'm starting by cleaning up the fuel system, new filter and lines if needed.
Thanks again for the good replies.
 

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