Runs poor after leaving Fuel on

[Harpkatt]

I'm a little confused, occasionally when I mistakenly leave the fuelcock in the on position when running into a store or similar short trip my 30 RPU won't run properly- Bucking and hesitating. I can get the truck to idle find and start without issue but any throttle and the engine tries to die. This never happens when I shut the fuel off. No amount of driving clears it up either. I'll turn the valve off to lessen the fuel in the bowl but there's no change. Anyone ever experience anything similar?

[johnbuckley]

sorry duplicate post

[johnbuckley]

... only on my lawn mower! If I leave the fuel swtiched the float valve gets stuck in the closed position ( It's a viton tipped valve on my lawn mower). I now have made it an absolute to turn off the fuel.
I noticed a similar sticking problem when testing a viton tipped valve on the model A so am back to using only grosse jet or conventional valves on A carbs now.

[old ugly]

when parked and the engine shut off, and the fuel supply valve is left turned on, does the carb drip fuel?
if so you need to fix that first.
you should not have to shut off the fuel every time you stop for a few minutes.

[old ugly]

duplicate post deleted

[Chuck Sea/Tac]

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It kinda sounds like your float inlet valve is sticking. Take your carb off and separate it, then you can check the valve operation.

[Marshall V. Daut]

Take a small hammer and tap on top of the carb, just above the fuel inlet. That will jar a stuck needle and seat. Your carb may be flooding when the needle sticks. Usually the jiggling action of the engine running will shake things loose again, but not always, especially if our modern gasoline gummo sticks the needle or ball bearing in place. Tapping the front top of the carburetor with a hammer before starting the engine will increase your chances of a success start.
Marshall

[J Franklin]

A key word "tapping" if there is any dicast.