fuel evaporation loss - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 08-13-2010, 11:01 AM   #1
Registered Member
 
rgs5081's Avatar
 
Join Date: Nov 2009
Posts: 22
Country: United States
fuel evaporation loss

Hai gassavers,

during some experiments on fuel economy, a strange thing happened. I was using a small bottle calibrated in CC ( I dont know its name ).while testing using the bottle mostly I fill upto 250 cc,drive till it is consumed fully and take note of the distance (In Kms). I am talking about motorcycle.mostly I shall get an average millage say 47 kmpl inside the city. but when I fill the fuel tank ( I measure and pour it inside every time and do not believe in the readings of the pumps at the fuel station) and drive I was always getting around 42 kmpl. I was so confused I had to check for leaks in the tank, tire pressure and all sort of other factors which where not the cause. Then I found out two things one cause was the weather, our hot summer, we do not have covered parking and usually park in the hot sun.
Next thing was the rubber insulator that isolates the inlet manifold and the carb. in my motorcycle there was a plastic flange gasket, As I had to put a 1/4 hose nipple for my experiments inbetween the carb and inlet manifold, I replaced the plastic flange gasket with aluminium flange extension with the hose nipple. and this arrangement was conducting the heat from the engine to the carb making the petrol in the carb evaporate. My carb shall hold about 50cc of petrol, so each time i stop the engine for a while 25 cc of petrol would be gone as vapour.if I stop about ten times for consuming one litre of petrol, i would lose about 250cc of petrol. i.e about 25% loss, the engine would have consumed only 75 %. Only then I foundout that modern motorcyles have rubber insulator inbetween the manifold and carbs which I had to follow to save some fuel.
__________________

rgs5081 is offline   Reply With Quote
Old 08-13-2010, 01:27 PM   #2
Senior Member
 
101mpg's Avatar
 
Join Date: Dec 2007
Posts: 736
Country: United States
Re: fuel evaporation loss

So did you manage to change to the rubber, and did it stop the issue?
__________________

__________________
Looking to trade for an early 1988 Honda CRX HF (Pillar mounted seat belts)
101mpg is offline   Reply With Quote
Old 08-13-2010, 10:49 PM   #3
Registered Member
 
rgs5081's Avatar
 
Join Date: Nov 2009
Posts: 22
Country: United States
Re: fuel evaporation loss

Quote:
Originally Posted by 101mpg View Post
So did you manage to change to the rubber, and did it stop the issue?
Yes, it really helped, but i could not use rubber because the rubber flange I fabricated bulges out while tightening and the hose nipple would come out stalling the engine.I also tried nylon flanges and I had to compromise with hylam flanges.

For more than a month I did not use my portable generator, I was trying so hard to start it and searching for some fault which turned out to be dry tank. I filled the tank with one litre petrol and three litre kerosene (It runs on kerosene and it starts using petrol) about a month ago while checking it. The kerosene is there but the petrol has evaporated . So this made me start this thread to share this experience. The sun gets through the window for about three hours on the generator and took away my petrol.
rgs5081 is offline   Reply With Quote
Old 08-14-2010, 04:25 AM   #4
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Re: fuel evaporation loss

You generator is stored indoors and the petrol is evaporating? That sound dangerous.
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 08-14-2010, 06:30 AM   #5
Registered Member
 
rgs5081's Avatar
 
Join Date: Nov 2009
Posts: 22
Country: United States
Re: fuel evaporation loss

Quote:
Originally Posted by theholycow View Post
You generator is stored indoors and the petrol is evaporating? That sound dangerous.
No not indoors its the balcony on the first floor with two side grill windows without shutters
rgs5081 is offline   Reply With Quote
Old 08-15-2010, 11:56 PM   #6
Registered Member
 
rgs5081's Avatar
 
Join Date: Nov 2009
Posts: 22
Country: United States
Re: fuel evaporation loss

Hai,
The point is the hot air from the engine compartment goes below the car heating the bottom along with fuel tank, somebody can check the temperature of the fuel tank after a long run , if necessary can insulate the fuel tank and see the difference in mileage. (caution in selecting the material for insulation it should be fire proof ). One more doubt do any car have a under cover for fuel tank .


please also see the video of my invention, which is also for saving gas
http://www.youtube.com/watch?v=2vgihaJqKuU
rgs5081 is offline   Reply With Quote
Old 08-16-2010, 07:30 AM   #7
Registered Member
 
Join Date: Dec 2007
Posts: 618
Country: United States
Re: fuel evaporation loss

The fuel tank filler cap assembly on my motorcycle doesn't sit quite flush. I'm assuming its from the previous owner's wreck.

Anyhow, on hot summer days, with the caps secured tightly on my fuel cans for the lawn mower, I can smell lots of evaporating gas in the garage. I realized last night its coming from the cap on the bike.
__________________

__________________
John
'09 Saturn Aura 2.4L
'94 Chevy Camaro Z28 (5.7L 6sp)
'96 Chevy C1500 (5.0L 5sp)
'08 Kawasaki Vulcan 900 Custom
'01 KTM Duke 2
Project84 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Incorrect Milage Calcuatlion PatM Fuelly Web Support and Community News 4 07-17-2009 08:21 PM
Missing Fuelup jmonty Fuelly Web Support and Community News 3 05-27-2009 05:10 AM
total fuel cost for fill-up instead of price per gallon EmptyH Fuelly Web Support and Community News 1 08-26-2008 12:14 PM
Why did it take me so long to find this place? Baranfin Introduce Yourself - New member Welcome 6 05-31-2008 05:17 PM
hi new member here and ive got some sick ideas! csrmel Introduce Yourself - New member Welcome 6 10-18-2007 02:23 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 01:12 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.