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Dave (NE) 
Orange Level
Joined: 12 Sep 2009
Location: Eagle Nebraska
Points: 2148
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 Topic: 720 Gas Cap
Posted: 13 Sep 2024 at 8:17am |
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For some reason, over the past several months the gas cap on my 720 will not easily come off as it used to. I have to use considerable pressure to lift and remove it. Yes, the nob parts on the cap are lined up with the notches in the neck of the tank, so that is not the issue. Any ideas? Thanks, Dave
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Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.
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AC720Man
Orange Level
Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 4914
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Posted: 19 Sep 2024 at 9:11pm |
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It may be the gasket sticking? My 720 would be running fine and then shut off. 20 minutes later it would start and run for 5 minutes and shut off. I lifted the hood and noticed the tank sides were sucked in. Removed the cap and the tank took a big breath of fresh air and the tank sides returned to their normal shape. Replaced both of my 720 caps with one with a gauge . Problem solved.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Dave (NE)
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Joined: 12 Sep 2009
Location: Eagle Nebraska
Points: 2148
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Posted: 19 Sep 2024 at 9:30pm |
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Yeah, its like the cap shrunk up or something. Hot or cold, it doesn't want to easily come off. Crazy thing!
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Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.
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Herb(GA)
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Joined: 15 Sep 2009
Location: United States
Points: 1036
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Posted: 20 Sep 2024 at 8:07am |
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I have filed the outside of the tank opening to reduce this tight fit. First, to be on the safe side I plugged the tank opening with clean rag. Herb(GA)
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Dave (NE)
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Joined: 12 Sep 2009
Location: Eagle Nebraska
Points: 2148
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Posted: 20 Sep 2024 at 8:11am |
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Yeah, I was thinking about doing that on the outside of the tank. Or, perhaps a wire wheel in my drill and do the inside of the cap.
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Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.
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Gary (sw Wis.)
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Joined: 12 Sep 2009
Location: S.W. Wis.
Points: 206
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Posted: 21 Sep 2024 at 7:43am |
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If it's plastic you might try leaving it off for a month or so. Remove it completely not just loose, need to get it away from the gas. That works on chain saw caps.
Edited by Gary (sw Wis.) - 21 Sep 2024 at 7:44am
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190XT - D17 - D14 - WD45 w/loader - WD - (2)B110 - 616H - 610 - B-208 - WD with 190 Mounted Corn Picker - All Crop 60
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Dave (NE)
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Location: Eagle Nebraska
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Posted: 21 Sep 2024 at 8:33am |
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Yes, it is plastic. So, keeping it away from the gas fumes will let it expand back out?
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Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.
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Gary (sw Wis.)
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Joined: 12 Sep 2009
Location: S.W. Wis.
Points: 206
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Posted: 21 Sep 2024 at 4:46pm |
Yes, I do it with chain saw caps all the time. The chain saw cap fit inside the tank and your mower cap go over the neck but I think it's worth a try. One more thought is the tank plastic? If so it may have expanded. I would like to know if it works.
Edited by Gary (sw Wis.) - 21 Sep 2024 at 4:53pm
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190XT - D17 - D14 - WD45 w/loader - WD - (2)B110 - 616H - 610 - B-208 - WD with 190 Mounted Corn Picker - All Crop 60
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Dave (NE)
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Location: Eagle Nebraska
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Posted: 21 Sep 2024 at 5:29pm |
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Tank is not plastic.
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Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.
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