We just had this I starting wondering if it was fuel related so I need to cheek this. I'm happy someone made a video about this problem.

I’ve ran it for ten hours since I disconnected the charcoal canister lines where they exit the tank on top. It runs like new. Your video helped me solve the issue. Thanks. Scag told my dealer shop foreman that it’s a known issue and there is a scag service bulletin addressing it. The replacement canisters are $83 each. Good luck and thanks again.

They are some great mowers! I have one that is 12 years old and never had a problem with it so far. I had it serviced a couple of months ago and ask them to changed the belts because they are the originals. When I went to pick it up they gave me the old belts back so I could have them for spares. They were still in that good of condition. I cut 3 1/2 acres. If you have an exit vent for the fumes there should be a place for air to get in to allow circulation are you would get raw fuel or vapor lock. You might want to look to see if the cap has a inlet vent. Hope you get it fixed Pm!! Have a good week my friend!!

Very helpful video,you demonstrate it willingly.thank you sir.

i think the check valve at the tank was fine. my other suspicion is the valve at the other end of the carb, it's supposed to open when the engine is running to purge the vapors into the engine. i'd check all lines, valves and clean any serviceable components in the charcoal canister. if on a whim the charcoal canister has a small crack then all bets are off with the system functioning properly and that could cause the issue. i always wondered why scag didn't put a small screen filter in the filler neck of the tank that you could remove and clean. dirty fuel going in, perhaps a bit too full, and/or some sloshing or driving up a slight incline could be enough to get some fuel in there and if it's been hotter in the garage or where ever you store it lately can create the right ingredients to make it siphon raw fuel into the charcoal canister and cause it to leak. this is an issue if this is stored in a garage where the fumes have access to a furnace, or water heater, any spark and boom, lawsuit. scag is good about chiming in on youtube videos, hopefully they will have a solution. when you figure it out, please post a follow up video :) I just bought a scag and have been putting it to the test making videos, etc.

Well you certainly did everything you could at that point.

We had this problem with one of our tiger cat 2s. The guy that ran the mower just overfilled the tank and once we let him know to not go over the white sleeve the problem went away.

Heard from mechanic today that said known issue from scag (repair bulletin issued). It’s from overfilling tanks or operating on steep hills where fuel may enter vent line and into charcoal filter and O2 sensor sees too much fuel coming to engine and cuts it off. No real solution other than keep fuel low enough so that doesn’t happen or circumvent charcoal system although That’s not officially recommended. I’ll see if this solves issue.

Any good videos on Scag FSC 30 push mower & 36" hydro walk behind mowers? I want to learn more about the 30" & Im getting the 36" hydro in the future.

I have a older snapper pro I use for commercial mowing. It has two six gallon tanks and I mow on extreme angles. Obviously I need to fill them completely up. If your gas cap is vented then what’s the point of dealing with all these problems. Just take them off. Yeah on hot days you’ll smell a little venting but leaking expensive fuel seems more dangerous than good

Good video. Question, how did you get to the two small filters you showed in the video?

I have a 2017 tiger cat 2 with Kohler 29 hp efi that has the same issue. Did your blowing out the carbon filter canister resolve the problem? Thanks. Great video.

Thank u.

My cub cadet xt2 with EFI engine has one of these. It acts like it’s flooded often. I can’t figure it out. I’m going to disconnect the unit by plugging the hoses and see what happens. It appears these are for environmental fumes consideration only.

Mine is doing the same thing. Did you ever figure it out

What the heck is the EPA Carbon Cannister? What does it do? haha

EPA Shit

Is there a way to bypass this damn thing! My older mowers run just fine without this government mandated BS.