F4i - Main Forum Main F4i discussion board

fumes from fuel overflow hose?

Old 04-12-2014, 01:48 PM
Thread Starter
Join Date: Oct 2013
Posts: 46
Default fumes from fuel overflow hose?

Probably a noob question...

As of right now I am doing a complete coolant flush on my 01 F4i and while waiting for her fan to turn on I noticed fumes exiting from what seems to be the fuel overflow hose that routes to the bottom of the bike. is this normal?

also, with distilled water in the rad... after turning her off to cool down I hear what sounds like bubbles moving about in the water pump area.

any input is greatly appreciated!
Old 04-12-2014, 02:27 PM
Join Date: Oct 2013
Posts: 49

As the engine heats up, so too do the vapors in the fuel tank which then expand and have to be vented somewhere. So, to answer your question; it's normal to smell vapors coming from the fuel tank vent tube as the engine is warming up at idle. On California bikes these vented vapors go through the charcoal canister where they are trapped. When the right engine operating parameters are met, the ECU activates the charcoal canister purge solenoid which draws fresh air into the canister and uses it to carry the fuel vapors into the engine intake. So, if yours is a California bike then there's probably a problem somewhere in your evaporative emissions system. If this is the case, it's not something I'd really worry about as it won't have any effect on engine performance or longevity.

Last edited by romoses4; 04-12-2014 at 02:29 PM.
Old 04-12-2014, 02:36 PM
Thread Starter
Join Date: Oct 2013
Posts: 46

terrific! thanks again
Related Topics
Thread Starter
Last Post
F4i - Main Forum
04-07-2019 04:40 PM
CBR 600F3
11-14-2013 05:23 PM
F4i - Main Forum
08-11-2011 07:31 AM
F4i - Main Forum
09-11-2008 11:36 PM
05-27-2008 10:54 PM

Thread Tools
Search this Thread
Quick Reply: fumes from fuel overflow hose?

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.