Skid Posted May 15, 2014 #1 Posted May 15, 2014 (edited) Well everything was going good till I got down to two bars showing on the gas gauge and felt the engine start to sputter. I switch over to reserve and nothing. It died. I stopped along I-77 and luckily a DOT man stopped to help. He called road service and brought me two gallons of gas. When I opened the gas cap it sucked air for what seemed for ever. After that it started, but I still got two gallons of gas I had already signed for. My lucky day. Anyone have problems with vapor locks? Edited May 16, 2014 by Skid
Dragonslayer Posted May 15, 2014 #2 Posted May 15, 2014 Well everything was going good till I got down to two bars showing on the gas gauge and felt the engine start to sputter. I switch over to reserve and nothing. It died. I stopped along I-77 and luckily a DOT man stopped to help. He called road service and brought me two gallons of gas. When I opened the gas cap it sucked air for what seemed for ever. After that it started, but I still got two gallons of gas I had already signed for. My lucky day. Anyone have problems with vapor locks? Sounds like your tank vent is blocked some how.
IronMike Posted May 15, 2014 #3 Posted May 15, 2014 I do think it is a problem more than some know. On the Roadstar we even vent the cap, You just take it apart and take the steel balls out and reassemble. No idea why Yamaha can't get a vent to stay open. We did this mostly because we eliminated the pump. I have even tried to kind of unblock the vent tube in the tank, there is something in there! Probably some kind of rollover protection. Thats when I had to resort to venting the cap. We also poked holes in the Neck, this allowed better venting and more capacity. However there is a reason they don't want you filling up that much, you will toast your fuel guage at about $100 a pop. Also like removed the rollover valve. Put like a K&N filter on in place of it. Now keep in mind when the bike was new untouched, I tipped it in slow motion like to about where gas went pouring out of the cap area, so none of that crap worked anyways. I've felt this happening to mine and just opened the cap. Keep a spare key in the tank pouch for such on the fly adjustments. I bought the other fuel pump, the one for planes, not installed yet but i wonder if it might do better.
Skid Posted May 15, 2014 Author #4 Posted May 15, 2014 (edited) Just checked the tank again after running out a half tank. Still sucking air. How hard is the cap to take apart and put back together? Edited May 16, 2014 by Skid
MikeWa Posted May 16, 2014 #5 Posted May 16, 2014 The fuel tank uses a separate venting system. There is a breather hose that connects to the tank under the ignition switch / tank top cover. To the right of the filler neck. If this vacuum hose becomes blocked you will get vacuum build up in the tank. Make sure the hose is not soft and collapsing and that it flows freely. Mike
Neil86 Posted May 16, 2014 #6 Posted May 16, 2014 The orifice in the vent elbow on the tank is veeeeeeeeery small...takes very little to plug it. You might unhook hose and also blow down the vent hose to ground to make sure the rollover valve isn't stuck closed.
JDaniel Posted May 16, 2014 #7 Posted May 16, 2014 I had the same issue last fall. Had to replace the roll over valve.
Skid Posted May 17, 2014 Author #8 Posted May 17, 2014 The orifice in the vent elbow on the tank is veeeeeeeeery small...takes very little to plug it. You might unhook hose and also blow down the vent hose to ground to make sure the rollover valve isn't stuck closed. Ok I check the vent tube and blew thru it. So I know it's open now. The orifice in the elbow is very small. Do I need to check it and if so how? Also where is this roll over valve located? Is it in the vent tube?
MikeWa Posted May 17, 2014 #9 Posted May 17, 2014 Try this. Disconnect the vent hose from the tube on the tank. (Not a full tank) Take the bike for a ride and see if the problem is still present. If it is gone the issue is somewhere in the hose etc. If the problem is still there then the tank portion is plugged. Mike
CaptainJoe Posted May 18, 2014 #10 Posted May 18, 2014 Jeff, Sooner or later you're going to have to do this, anyway... Take your gas cap off... take in house on kitchen table... Place upside down... remove two screws... Very carefully lift center piece... there will be two cams and two springs... take note of their position... under that is some very small rubber (believe triangler pieces) Clean, reassemble, blue locktite both screws... I had to fish mine out of the bottom of my tank and reassemble from scratch... Good Luck!
JDaniel Posted May 18, 2014 #11 Posted May 18, 2014 Roll over valve is right next to the fuel filter in the vent hose.
willimt Posted May 18, 2014 #12 Posted May 18, 2014 My new to me 07 I found out (not a good way) that the tank vent is blocked, someone got rid of the rust in the tank and coated the inside of the tank and that I believe covered the vent. This link is the one i used to vent my cap. http://roadstarclinic.com/content/view/136/96/ I hope this helps. Mark
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