1998 vmax 600

2

2stroken

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Joined
Jan 8, 2005
Messages
172
Age
52
Location
Western Michigan
1998 xtc vmax 600 twin, oil tank was full of fuel, after setting.
Fuel tank cap had pressure in it, when it was opened. We are guessing that somehow the engine pulse for the fuel pump is pressurizing the system, and pushing the gas in the tank. Does the fuel pump have a check valve? Ideas??
 
check the vent lines. had one pinched on an SRX. had it on the trailer and it was backfeeding the oil tank so bad it was puking oil and gas out of the oil tank.they route under the steering plastics. feel lucky you didnt smoke a motor!
 
Now why is it building pressure in the tank? Is that just the nature of the beast? I have suggested that he put some oil in the gas tank until he knows the problem is resolved. I figure the worst would happen would be fouling some plugs a little bit.
 
so your saying if you drain the oil tank, fill it with oil and fill the gas tank, let it sit over night and they somehow mix themselves together? this doesnt seem possible given you have to have ome sort of pulse for the fuel pump to draw from the tank. if you are riding it around or trailered the sled anywhere it will build enough pressure to backflow.
 
SpartaSXr said:
so your saying if you drain the oil tank, fill it with oil and fill the gas tank, let it sit over night and they somehow mix themselves together? this doesnt seem possible given you have to have ome sort of pulse for the fuel pump to draw from the tank. if you are riding it around or trailered the sled anywhere it will build enough pressure to backflow.
Click to expand...


I am saying park the sled in the garage, start it up, tank gets pressurized. We agree the tank has a vent issue, which will address. Oil tank hasn't been drained of gas yet. Suspect that the temperature change from storage let the gas expand and push the oil out of the oil tank and be filled with gasoline. Might have even expanded and contracted enough that over the summer it eventually filled the oil tank. Just trying to get this figured out. It is a friends sled. I am flying from MO to michigan to meet him and I will be riding it. If it breaks then sledding won't be quite as fun, unless someone has a sled that I can use.
 
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