Fuel tank vent 522XI

[Bigwatersig 2]

So I rebuilt carb and replaced fuel pump, thought fuel pump would fix my problems. No such luck! Still stalled out when she got hot. Took apart fuel tank shutoff, cleaned and lubed o ring, knocked some dirt out of vent tube with long wire, blew long fuel line, drained tank and tried some air pressure both ways, tank fuel outlet, and thru vent tube. Doesnt allow hardly any air flow either way? What is between tank and vent tube? A really small orifice, or some sort of pressure valve vent device? Put it back together and ran her with coffee filter banded over cap, NO PROBLEMS! Was so glad to move some dirt that I never tried putting cap back on! I think maybe there was blockage at tank shutoff, valve was very stiff and difficult to turn. Looks like a major ordeal to access fuel tank???

I will try putting fuel cap on tomorrow, but I had ran her prieviously with cap loose so I think my problem is solved. Vent sure doesnt seem right though?

[shallowwatersailor 3,213]

You might consider changing the shutoff valve and bushing as the mesh screen may be clogged. As far as gaining access to the fuel tank, it is just a question of taking off the fenderpan and footboards. If you do that, I would spend some time cleaning the frame, transaxle, and tractor that are covered. Make sure that the fuel line lays in the cutout for it when putting the fender back on.

[gwest_ca-(File Mod) 11,040]

Garry

[Bigwatersig 2]

Wow, that is a lot of vent tubing!!! Guess my wire didnt make it very far! This may be the reason my dad didnt use the tractor much, he always had other lawn tractors that he used instead. I remember he was frustrated with it, but he was too cheap and stubborn to even buy a new fuel filter, just wanted to clean with jet spray and blow the old one out. I took the shutoff completely apart, i didnt see any screen mesh?

And thanks for the info

[Bigwatersig 2]

Has been to cold to move dirt, frozen solid! Cranked her up to day, wasnt even warmed up completely when she started sputtering. Realized fuel cap was on, pulled cap and ran her all day with coffee filter banded on, no problems, guess im going to have to take her apart and check out that vent tubing.

[WVHillbilly520H 10,373]

Could be the cap, on my diesel the rubber seal has came loose from the the center vent and falls off every time take the cap off that will cause a "vapor lock" too, and that vent tubing is basically wiper fluid tubing probably has crud in it...and you may be surprised what is hiding under that fender pan which really is quite easy to remove with seat still attached and foot rests stay on tractor to get the tank off, mainly Torx head screws and electrical plugs...Jeff.

[WVHillbilly520H 10,373]

I'll add a couple pics of an actual xi torn down to the frame...why it's a good reason to pull it apart and clean it up, and how much vent hose is wrapped through the top of that tank,Jeff

[Bigwatersig 2]

Awsome pics thanks, hopefully I will get to it when it warms up again. Was really warm through holidays but busy with family.

[Forest Road 594]

If you ever do pull the fenders I'd recommend changing out all fuel lines. I'm told they do break down over time, thank you ethanol. I use my tractors just a few times a year. I've installed inline shut off valves and marine style inline hand pumps for priming. It's worked out well for the last 3 years. 

[LRE 8]

Wvhillbilly520H, may I ask the reason for pulling your tranny out

Edited January 25, 2017 by LRE

[WVHillbilly520H 10,373]

I didn't, that's another member on here I used those photos as way for O.P. to see the fuel tank and it's hoses, can't remember the actual reason other than he was going completely through the tractor front to back,Jeff.