Ski-Doo Snowmobiles Forum banner

Help-Engine full of gas!!

9.8K views 11 replies 10 participants last post by  Bill8R  
#1 ·
Looks like a kinked vent line caused my engine to fill up with gas, coming out the carbs & the exh.
How should I handle this? Pull the plugs crank it over & try new plugs or???
Thanks in advance
-This also explains the gas smell I can't get rid in my house .lol.
Thanks in advance.
 
#2 ·
No Do NOT Use a shop Vac!!!!

Shop vac's use a Brushed motor.Which has sparks and arcing inside. gas is flamible. The motor acts like a spark plug and, well, you wonr need to worry about a vent line no more....

Seriously, take plugs out, Pipes off and slowly turn the engine over a few revolutions by hand on the clutch Then, with kill switch off, you can manually pull over by hand with the recoil starter. Don't use the Elec start, if equiped, Sure way to wreck internals. Keep pulling untill no more fuel blows out the plug holes. Then insert plugs and attempt to start. May take ALOT of pulling with plugs out to clear all gas. Pullstart to start engine. Don;t use elec start untill sure all gas is purged from cases
 
#3 ·
Just pull the plugs and crank it, leave the plugs out overnight crank again the next day, put in new plugs and it should be fine. In the days of recent past when you could open the hood to actually expose the engine we'd put one guy on a propane torch and another on the pull rope and went to town. It made a blow torch but worked fast and effective, was it safe? Probably not but it always worked and nobody ever got hurt. I DO NOT recommend doing that on a rev or XP with the motor buried in a big plastic containment.
 
#5 ·
After you get the gas out I'd get it running and then "fog" the motor before I run it much.

I had the same thing happen to a 94' XLT. Drained the gas out and then got it running, and promptly siezed it up as I took it for a trial run. After thinking about it and tearing it apart, I believe the gas filled crankcase "washed" the crank bearings of their oil film, leaving no or minimal lubricant when I first ran it.
 
#9 ·
You sure it was due to a vent line? I've seen the motor fill with fuel from a tear in the fuel pump diaphragm...
X2

Also could be a stuck needle and seat and/or a damaged float (I bent a float once which caused the needle to not stick in the seat and it filled my case up with fuel... I also had a leaky float that filled up with fuel allowing the needle to NOT seal in the seat and it also filled up my case).

Either way you need to get it out - the older sleds had a case drain plug on them, but the new ones don't. Pulling the plugs will make it pull over easier, but it will shoot gas out all over. You should take the carbs off and stick a siphon in the case and/or remove the exhaust manifold and tilt the sled... this should get the bulk of it out. It will be a messy job...

GOOD LUCK!
 
#11 ·
seen a bad fuel pump this year on an older sled, what a mess. pull the fuel line off the carb with fuel in the tank and the check valves working and no fuel should drain, if it makes puddles the pump may be bad. presure check is best/recomended

if you have estart be carefull you don't bend a rod

put oil in the sparkplug holes and the carbs and then pull over a few times to relube the crank since the raw fuel washes the bearings clean. you can also use a coat hanger to pull on the oil pump arm at first start up, but is a bitch on an xp
 
#12 ·
Is there any way to know if there was any damage caused by this? Or just lube and fog and be happy it still runs? Got to go quite a ways to ride right now- still praying for more snow. Only has warranty till mid Dec so hopefully we get one more blast - if not I'm very tempted to get rid of it in fear of buying new motor next year.