gas boil in tank

peter chechotko · Post by **peter chechotko** » Tue May 29, 2007 10:20 am

alright, here s the skinny. i have 2 , 1979, s. one an early model, that when the engine is warm, and you fill up the tank. within a few minutes, fuel will expand and gush out of the filler spout. the late model does not do this.???? i was thinking of , getting some heat barrier material for the bottom of the tank. has anyone tried this, or are there any other solutions besides. running less fuel in?

alimey4u2 · Post by **alimey4u2** » Tue May 29, 2007 11:01 am

Hmmmm..When you say fuel is expanding & gushing out of the filler spout, me thinks that air is expanding forcing the fuel up & out... I have a 1980 model & have never witnessed this phenomenon, although I never fill when on the centerstand thus leaving a larger air gap. The reality I feel, is that you are filling the tank up too much...
Educate me here fellas, did the early tanks have filler stand pipes ??

Terry · Post by **Terry** » Tue May 29, 2007 11:55 am

Never had this experience. My guess is that the gas cap vent is clogged, and/or you're filling the tank too full although I never seem to be able to fill mine all the way no matter how much fuel I try to get in there. As for heat shielding material, it doesn't get (that) hot Peter. :)

peter chechotko · Post by **peter chechotko** » Thu Jul 23, 2009 9:36 am

yup yer right boys , gas cap was problem, switched caps, all good.

Terry · Post by **Terry** » Thu Jul 23, 2009 3:46 pm

You didn't wait two years to try this did you?

alimey4u2 · Post by **alimey4u2** » Thu Jul 23, 2009 6:55 pm

Strangely we had the same situation at the Worldwide CBX Mega Rally... Carl had had the same problem with a loaner bike. We were at at Burger King when we were alerted to a gas overflowing problem.

I said: ( In a deep sage like voice) "Park it in the shade".. To which Carl went forth & parked it in the shade. Low & behold... The eruption stopped forthwith... The deciples looked upon me & gave me the name... Nostradumbass..