Ice Man
Active member
OK guys --thanks for the feedback After researach here is my premilinary resolution:
1. The problem is a vacuum problem and not a pressure issue
2.) The vent hoses to the gas tank are not the issue -- both vent feely -- no blockage
3.) Temp does not cause higher tank pressure -- as the burning of fuel causes a vacuum in the tank -- the tank has a vacuum issue and will imlpode if vacumm is not relieved. I had a new 1982 Audi that had this problem and it took two new gas tanks before this issue resolved.
4.) The gushing "sucking sound" is, in fact, a suction sound -- resulting in a an explosion of fuel from the gas tank -- too much air rushing into the tank causing a gushing of fuel from the tank -- this really has nothing to do with the air temp as we are only dealing with a 30 degree variance.
5.) The bottom line problem is not enough venting of the fuel tank -- never a problem in the first 12k miles for my 05. I have an appt with local Yamaha dealer to have this problem looked at (in addition to 12k service). We may find that the fuel cap vent (fuel filler cap) has a venting problem due to washing of the bike and any dust, debris being washed into the vent hole.
I discussed this problem with my dealer - who promised to discuss with Yamahal-- will know in a week what they suggest is the problem.
1. The problem is a vacuum problem and not a pressure issue
2.) The vent hoses to the gas tank are not the issue -- both vent feely -- no blockage
3.) Temp does not cause higher tank pressure -- as the burning of fuel causes a vacuum in the tank -- the tank has a vacuum issue and will imlpode if vacumm is not relieved. I had a new 1982 Audi that had this problem and it took two new gas tanks before this issue resolved.
4.) The gushing "sucking sound" is, in fact, a suction sound -- resulting in a an explosion of fuel from the gas tank -- too much air rushing into the tank causing a gushing of fuel from the tank -- this really has nothing to do with the air temp as we are only dealing with a 30 degree variance.
5.) The bottom line problem is not enough venting of the fuel tank -- never a problem in the first 12k miles for my 05. I have an appt with local Yamaha dealer to have this problem looked at (in addition to 12k service). We may find that the fuel cap vent (fuel filler cap) has a venting problem due to washing of the bike and any dust, debris being washed into the vent hole.
I discussed this problem with my dealer - who promised to discuss with Yamahal-- will know in a week what they suggest is the problem.