Fuel tank vent to canister but no canister

[cb75076]

This is on a 1996 R1100RT. It doesn't have an evaporative emissions canister. I'm the fourth owner, so I don't know if it ever had one. I replaced the fuel filter several weeks ago and haven't seen any leaks anywhere. One thing I noticed though is that I now see just a bit of gas condensation at the end of the vent hose. It happens as the bike sits in the garage and the day warms up, and about a half hour after I stop riding. It's just enough to dampen the end of the hose - not even really a drop. When I removed the fuel tank earlier, I noticed that that same vent hose had a decent sized hole worn in it right where the hose joins its coupling, over the big bolt on the right hand side, that holds the tank on. I taped over the hole in the hose. My question is, why am I now seeing this small amount of condensation, and is it normal? My theory is that this vent hose used to "vent" at the worn-through spot, but now is venting at the end of the line. If your bike doesn't have a canister, do you see very small amounts of vapor condensing at the end of the hose?

Thanks,

Jerry
NJ

[TheRoss]

If your bike doesn't have a canister, do you see very small amounts of vapor condensing at the end of the hose?


The bike had a canister at one point, but a previous owner removed it. The removal is very common and you should not worry about it.

You can see a little fuel coming from the vent hose. With or without the canister, the tank still has a vent hose. It is normal to see it in hot weather. But I would correct the hole rubbed in the hose. You don't want any fuel dripping onto paint or other bike surfaces. Without the tank vent the tank can vapor lock, shutting the engine off.

[jduke]

It came with one from the factory, but a lot of people take them off because if you overfill the tank and raw fuel gets in the cannister, it runs very rough until the raw gas is run out.
I think you're right about the hole venting before it got to the end of the hose.
I wouldn't worry about it.
Jerry

[cb75076]

Thanks, guys. That's exactly the info I was looking for. I will replace the damaged vent hose.

Jerry
NJ

[2BikeMike]

This is on a 1996 R1100RT. It doesn't have an evaporative emissions canister. I'm the fourth owner, so I don't know if it ever had one. I replaced the fuel filter several weeks ago and haven't seen any leaks anywhere. One thing I noticed though is that I now see just a bit of gas condensation at the end of the vent hose. It happens as the bike sits in the garage and the day warms up, and about a half hour after I stop riding. It's just enough to dampen the end of the hose - not even really a drop. When I removed the fuel tank earlier, I noticed that that same vent hose had a decent sized hole worn in it right where the hose joins its coupling, over the big bolt on the right hand side, that holds the tank on. I taped over the hole in the hose. My question is, why am I now seeing this small amount of condensation, and is it normal? My theory is that this vent hose used to "vent" at the worn-through spot, but now is venting at the end of the line. If your bike doesn't have a canister, do you see very small amounts of vapor condensing at the end of the hose?

Thanks,

Jerry
NJ
Just curious, but is there a story behind your avatar?

[mtboulder]

It's possible that the vent hose inside the tank has a small crack or leak in it and changing the filter could have aggravated the problem. This hose and also the hose for the water drain on the rim of the tank fill hole will break down over time and need to be replaced. If either one develops a leak inside the gas tank then gas will find its way to the bottom of the hose. I had to replace my hoses two years ago on a '95 R1100RS.

[cb75076]

Hi 2bikemike,

The avatar is a joke on the character, Inigo Montoya, from the movie, The Princess Bride. Throughout the story, he is searching for the man who killed his father, waiting to greet him with the phrase you see in the avatar. The joke is that the phrase has been made into a stereotypical "Hi, my name is ... " label that people wear at social functions where they don't know anyone. Of course, if you have to explain it, it's probably not really that funny...


Jerry

[cb75076]

Hi mtboulder,

Thanks for relating your experience. That is why Ias posted the question, and what I'm suspecting, but don't have enough direct evidence to confirm. For now, I'll just stick to "watchful waiting" of the hose ends, and see if anything changes. I did buy replacement hose, just in case. I just don't want to have to open everything up again right now if I don't have to, and the fact that some folks report the occasional, small amount of condensed vapor as normal leads me to believe that this is okay for now, but have made a note to self ...

Jerry
NJ

[cb75076]

Hi mtboulder,

a couple questions - regarding replacing the vent hoses inside the tank, the dealer's parts diagram shows, for each hose set (filler overflow and vent), that each hose is connected at the filler end, then is joined with a plastic coupler to another piece of hose that is connected at the fuel pump/filter plate. Did you replace the hoses on each side of that coupler? And did you have to remove the fuel filler plate to access the hose at that end?


Thanks,

Jerry
NJ