Originally Posted by astuber
Did you hear a whoosh sound when you removed the gas cap? If so, then you definitely need to do a canisterectomy. The canister has become clogged and is not allowing the tank to vent. When this happens it sucks in the side of the tank and bends the float assembly. The tank should return to its' normal shape when you remove the gas cap. Usually the gas gauge will indicated about 1/3 of a tank when empty if this has happened. Several people have been able to repair the float assembly and not had to replace it.
Here's a bit more background (I'm trying to think of anything that might be relevant). The LT is a 2004 with 8100 miles on it. Saturday I rode to Cass, WV with a friend. Got there, rode over to Snowshow then headed back to the motel and filled up at a gas station across the street. I put in 4.65 gals, the odometer read 228 miles, the BC showed 138 rem. mi. and the indicated MPG was 45.1 (do the math and the actual mpg should be 49.03 - hmmm). The low-fuel light wasn't on at that time. I think there may have been a bit of a whoosh when I removed the gas cap but . I can't be certain. FWIW, my GPS showed 220 miles and that translates to 47.3 mpg.
The next day we did some riding then headed home. I rode to work this morning and ran out of gas. Oh yeah, the warning light does come on with the ignition so the bulb isn't burned out.
I called my dealer, Eurpoean Motors of PGH, and told them about it. They suggested what I'd planned on doing: burn up another tank and see what happens. The bike is still under warranty so it ought to be covered.
Since the fillup this morning I've ridden 27 miles, the BC shows 41MPG and 236 Rem Mi. (increased from the 110 at the fillup even though I reset the BC then). As I mentioned, I put in just a bit more than 6 gallons this morning so I guess the tank isn't deformed.
The bike has seemed to run a bit rough lately at low idle (at stop signs/lights), in fact it stalled a couple times on me today. Don't know if that's related. I had used a few tanks of regular - from good gas stations - and today I put in 89 octane.
Thanks for the tips. I'll eventually do a cannisterectomy but I'll wait until the bike is out of warranty.