Fuel Evaporation???


Anything goes - doesn't fit any other category!
Post Reply
User avatar
Solina Dave
Posts: 668
Joined: Fri Dec 26, 2014 6:38 pm
Location: Port Hope, Ontario, Canada
Motorcycle: 1978 Honda Goldwing GL1000 (bought in fall of '77)
!977 Honda CB550F (my 1st motorcycle)

Fuel Evaporation???

Post by Solina Dave »



Does anyone else notice a considerable amount of fuel missing from the bike after winter storage? My GL1000 is away for about 6 months. I realize that the fuel in the carbs evaporates, but is there a lot of fuel lost to evaporation from the fuel tank also? I mean maybe as high as 15 to 20 percent.
I always top up the tank prior to storage. I average pretty close to 50 mpg. However, on the first fillup of the new riding season, and only the first fill, I'm noticing a significant reduction in my fuel milege. As low as 26 mpg to 38 mpg.
All the fills after that have the mileage hovering in the 50 mpg. range, give or take. :?

I'm at a loss........................Dave


"Assume Nothing"

User avatar
dakotanator
Posts: 140
Joined: Sun Jul 20, 2014 10:07 am
Location: Columbia Falls, Montana
Motorcycle: 1973 Suzuki TS185 (sold)
1981 Suzuki GS750L (sold)
1992 Suzuki 1100 Katana (sold)
1981 Honda CB900 Custom (sold)
1983 GL1100A Aspencade

Re: Fuel Evaporation???

Post by dakotanator »

Just "woke up" Ginger ('83 Aspy) last week. Her tank was almost as full as when I put her away in November. Only about a 1/4" down the neck from the top I filled it up to.
It's not WHAT you ride......it's THAT you ride.

User avatar
landisr
Posts: 758
Joined: Tue Jul 28, 2009 12:18 pm
Location: Gilbert, AZ
Motorcycle: 1976 GL1000
1976 GL1000LTD
1994 GL1500A

Re: Fuel Evaporation???

Post by landisr »

You may have got some junk gas on your storage fillup, and combined with the stabilizer, just suffered through running it out of the system. If it's running good and your typical mileage has returned, I would just chalk it up as a Mystery Of The Universe. 8-)

I don't even bother checking mpg for the first tank or two of the season.

Ron in AZ
I'm not so sure about an inner child, but I have an inner idiot that surfaces every now and then.. :mrgreen:

User avatar
newday777
Posts: 1783
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH summer/fall & Oceanside, CA winters(N San Diego) with lots of miles riden between
Motorcycle: 2008 Cabernet Red. Level 4

1983 GL1100A Wineberry 36,000 miles

1975 CB750 K5 Planet Blue 7,800 miles

1976 CB750 K6 Anterris Red 25,000 miles

Past rides
1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: Fuel Evaporation???

Post by newday777 »

Rather than evaporation, I would suggest to be looking for a leak into the carbs and oil overflowed from a leaking petcock if you turned it off or if you didn't turn the petcock off, leaking float valves and thus getting a cylinder or more filled with gas and siphoned gas into the motor.



Post Reply