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what does the gas tank fj11 front vent tube do?

Started by mtc, April 11, 2019, 02:55:05 PM

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mtc

it connects to a T... and into 2 hoses, where do they go and how important is it to connect it


bike runs fine, i forgot about them, will pull the tank later, but not now
Current
1985 FJ1100

Previous Bikes
1979 Yamaha XS1100 best one
1984 FJ1100
1987 FZR600
1987 Fazer
1985 Vision
1982 Seca 750
1978 RD400 Spec II Motor

Live Life Wrong and Perspire

FJmonkey

I think that is a vent for emissions. Not sure if it can be plugged or if it needs to remain as a vent.
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

Pat Conlon

My '84 was a Calif model with the charcoal canister tank vent system.
There were vent ports on #1 and #4 carbs that were a part of this system.
Be sure the unused ports on those 2 carbs are plugged. Follow the hoses, you'll see where they are...

The vacuum ports on the intake manifolds are different. Again, these ports I'm referring to were on the carbs.
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

mtc

i did see, canisters, i suppose it's a California model, i live in CA, do i can plug the vent on the tank and delete the cans if i was  on a desmog misson?

i think last i saw was all vacume ports on intakes were capped, except #1 for the fuel petcock

i will just leave them, so it's not like it's some vacuum leak right now? so you are saying the fumes travel from the carbs to the tank and not the other way?

maybe that hose coming from the tank can be plugged with no ill effect? it's not leaking nothing at the moment and runs/rides fine
Current
1985 FJ1100

Previous Bikes
1979 Yamaha XS1100 best one
1984 FJ1100
1987 FZR600
1987 Fazer
1985 Vision
1982 Seca 750
1978 RD400 Spec II Motor

Live Life Wrong and Perspire

mtc

Met FJ Monkey today and during the valve "job" we yanked the canisters, hoses and it cleared up the front real good and roomy now with better airflow looks like
Current
1985 FJ1100

Previous Bikes
1979 Yamaha XS1100 best one
1984 FJ1100
1987 FZR600
1987 Fazer
1985 Vision
1982 Seca 750
1978 RD400 Spec II Motor

Live Life Wrong and Perspire