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#420 ronecat (User) Fresh Boarder Posts: 2 gas tank seems to have vapor lock? HELP! 4 Years, 4 Months ago   Hello I have a 2001midnight star. what is happening to me is this, the fuel form the tank will stop flowing threw the fuel line.The thing that is frustrating is that it doesnt happen all the time. what gives? I am running a mikuni 42mm HSR .The stock fuel pump has been removed. the mikuni is gravity fed from stock petcock.Any help would be great..thanks Ronecat!<br><br>Post edited by: ronecat, at: 2004/08/22 06:27   Logged     The administrator has disabled public write access. #421 widetrack (User) Fresh Boarder Posts: 38 Re:gas tank seems to have vapor lock? HELP! 4 Years, 4 Months ago   Hey Ronecat, Check to see if the rollover valve is trying to plug up. This will cause the tank to quit flowing fuel. It is down by the battery box. You can unhook the line to it up at the top of the tank under the speedo bezel. David   Logged     The administrator has disabled public write access. #422 CRASH (User) Junior Boarder Posts: 184 Re:gas tank seems to have vapor lock? HELP! 4 Years, 4 Months ago   When did they move teh rollover valve? My 2003 has it up just below the frame neck and that is where most AIS and SMOG removal docs show it as well. BUt I saw a digi pic on a forum showing where you describe. I KNOW mine is not there tho. Just curious. Thanks CRASH   Logged     - - - - - - - - - - - - - - - - - - - - - - - - - CRASH Visit my Hellriser Garage and check out my bike!   The administrator has disabled public write access. #423 widetrack (User) Fresh Boarder Posts: 38 Re:gas tank seems to have vapor lock? HELP! 4 Years, 4 Months ago   Crash, You're probably right. Mine is an '04 and it's down by the battery. David   Logged     The administrator has disabled public write access. #424 DL (User) Moderator Posts: 105 Re:gas tank seems to have vapor lock? HELP! 4 Years, 4 Months ago   Add a fuel filter if you have not between the tank and fuel valve? How about sediment in the tank? Remove the rollover valve. This should get you started in the right direction. Dick   Logged     \\\"A Nation Which Forgets Its Defenders Will Itself Be Forgotten\"   The administrator has disabled public write access. #492 Beekstar (User) Fresh Boarder Posts: 3 Re:gas tank seems to have vapor lock? HELP! 4 Years, 3 Months ago   This has happened to mine in the past and I found that Yamaha has placed the rubber vent tub that come off of the steel vent line on the tank in a location where it can collect water from your front tire in heavy rains and doesn't drain very well. Try relocating that vent tube or as I have done I have just cut the line shorter and rerouted it under the gas tank. It seems to stay dry under there and the tank can still vent.   Logged     Beeker (Mark Verbeek) Ride Fast , Ride Hard , Ride Safe   The administrator has disabled public write access. #501 centurion350 (User) Fresh Boarder Posts: 2 Re:gas tank seems to have vapor lock? HELP! 4 Years, 3 Months ago   mine was doing the same thing when I switch to the 42 mm carb but only when it was hot outside. Rejettitng fixed my problem. If you would like to email me centurion350@msn.com I will galdly show you the co readings I took wile rejetting the bike.   Logged     The administrator has disabled public write access. #506 Tazman1602 (User) Fresh Boarder Posts: 20 Re:gas tank seems to have vapor lock? HELP! 4 Years, 3 Months ago   HSR42 Mikuni Gravity fed? You need to vent your gas cap dude: On the under side of the cap there are two screws. Remove them be carefull of the two little springs that push out on the lock tabs. Remove the cover for the lock tabs note how the tabs and springs fit together. Then remove the seal plate. Under there you will see two tiny rubber plugs in some small holes. Remove the rubber plugs and anything else that is in there. You will see some smaller holes at the bottom where you removed the plugs. Those are vents to atmosphere. Reassemble the cap. It is now vented. The tank vent alone isn't enough to keep the flow going to the HSR42. TM1602   Logged       The administrator has disabled public write access.

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