| Author | Message | ||
     Cobradave93 |
A few weeks ago I installed a California canister in my bike. I rode my bike last Friday for the first time since when it got into the 70's. When I stopped, I could hear the fuel boiling so I opened the gas cap. When I did this, alot of pressure came out of the tank. Is this a problem common with the canister or the fuel vent itself? This is the first time I ran this bike in the warm weather so I don't know if the vent was working right in the first place. | ||
| Supertt_fl |
what year is your bike??? | ||
| Carter |
My CR does the same thing. I think its because the headers get so hot and the rear headers location relative to the fuel tank. During operation the fuel pump prevents the tank from forming a positive pressure. When you shut the bike off the hot header and engine boils the fuel and forms a positive pressure causing high amounts of vapor to be expelled from the overflow line. The vapor as it travels through the line condenses and drips from the end until the pressure inside the tank is equalized. Or the vapor runs into your catch can and has no where to go. If your not dripping fuel consider your self lucky. The pressure/vapor will eventually condense back into liquid and either collect in your "can" or in the tank. | ||
| Supertt_fl |
carter a little trick that i've learned, as soo as i shut off the bike i pop the gas cap and let it vent that way.. you don't have to worry about gas dripping all over thee garage floor, that way | ||
| Cobradave93 |
This is an 08, and this has enough pressure to blow the cap back into my hand when I turn the key. Way more than normal. Is this more of a problem on California bikes? | ||
| Oddball |
Check that hose for a pinch or something. As well as the line going from the can back to the intake. Make sure everything will flow air. May need to have your dealer take care of it. Perhaps a tech can jump in here with advise. | ||
| Chevycummins |
I think the fuel tank pressure on the bikes with the charcoal canister is normal. The cali bike guys were noticing that a while back. At least with some pressure in there the gas won't boil as soon. It increases the boil point. | ||
| Parrick |
I agree with Chevycummins that the pressure build might be a good thing. My 09 has the open vent system and I have been working on a fix for the fuel spattering problem. My bike will vent/condense & dump between 20-30ml of fuel after a run. (This might explain some of the "Cluster indicated MPG vs. calculated MPG discrepancy" discussion that has been going on here.) Yesterday I rigged up a catch bottle that splices into the vent line under the seat where the vent tube transitions from rubber fuel line to plastic tube. It is set up similar to a cooling system reservoir so that condensed fuel is sucked back up into the tank as the tank cools. Yesterday's preliminary test looks good. The reservoir I rigged up is a bit undersized but it condensed & caught about half of the fuel vapor and then the condensed fuel was sucked back up into the tank when the fuel stopped boiling. After it did that I poured the fuel that had gotten past the reservoir into the reservoir bottle while the tank was still cooling & it sucked that back up too. I have been considering incorporating a pressure valve into the final system to maintain some pressure in the tank, increase boiling point & reduce the amount of fuel that vents and has to be reclaimed. | ||
| Doerman |
My CA 2008 1125R obviously has the cannister and does not build a tank pressure. The cannister is designed for a one way flow. I think there's a check valve in there somewhere. Make sure you hooked the hoses up the right way. | ||
| Cobradave93 |
I double checked the hoses, they were correct. I pulled off the fuel vent hose and blew air into it. The canister seemed to not allow air to flow freely, but it went through. I also took off the hose that goes from the canister to the throttle bodies, blew into that and it was completely free. I also took out the fuel vent and found that no air passes through to the top, but that probably takes some pressure to release the valve. So is the canister bad or is it supposed to be that way? I'll get the dealer to check it later in the week if no one here has come across this problem. | ||
| Parrick |
The fuel tank vent fitting should flow freely but only in the upright position. It is a turnover valve so if you blow on it when it's sideways or upside down it won't pass air. |
