Mystery Hoses

[WoahGold]

So I'm kind of super angry at the shop that I took my bike to when I had the oils and coolant changed. They did not hook up my fuel tank correctly (which was the ACTUAL cause of the leak not a cracked hose. I mean honestly how can you not tighten a hose clamp properly?). When I pulled the tank off I discovered these two hoses that weren't even hooked up at all. I see that according to the Haynes manual that they are vacuum hoses, but can anyone tell me which one hooks to which port on the tank? Thanks

[frankenduck]

No mystery involved: http://www.motobrick.com/index.php/topic,989.0.html

[WoahGold]

Awesome, thanks

[Fossil]

Name of shop????

[WoahGold]

The shop was Sarek Autowerke in Petersburg, VA.
It was either them or Morton's BMW in Fredricksburg.
I went to Sarek because they were about a half hour closer. They were plenty nice enough and their rates were reasonable. This just makes me question their skill.
Next time I need shop work I'll go to Morton's.

[Honolulu]

Both these hoses end up in the same place - dumping to atmosphere.   Thus why does it matter which is connected to which?

Take my word for it... it's easy not to tighten a fuel hose. If it was a pressurized hose, there's a good chance it'll pop off and you'll have a naughty fire.  DAMHIK.

Those two vent hoses are not likely to be so consequential, but rather than rant online, and since you've already put in the effor to take and post pictures, just reconnect them and be done.

[Scott_]

Both these hoses end up in the same place - dumping to atmosphere.   Thus why does it matter which is connected to which?


Those two vent hoses are not likely to be so consequential,

Oh contraer there. it does matter if they are still connected by the factory install.
Out of the factory, 1 of the hoses goes down the frame and dumps on the ground. It's for the hole at the side of the fill cap to drain rain water before you open the fill cap.

The other hose travels down to the front of the engine block and connects to the crank case(the inside of the engine). The tank end nipple that is supposed to be connected to it is the internal vapor vent for the gas tank. Government emissions controls, etc......

Yes there is a conversion to cap the hose to the crankcase and install a collector "cup" that fits under BOTH nipple to then drain down to the ground.

I wouldn't want to connect that crankcase hose to the rain drain nipple. I don't think you would either.

[frankenduck]

It's actually not for rain but for fuel overflow.  When gas comes out of a large tank in the ground it can be much cooler then ambient summer afternoon temperature.  When it heats up and expands....

[Inge K.]

Sorry, I agree with Scott on this one.
The water drain pipe ends up at the outside of the gasket at the filler flange.

Inge K.

[frankenduck]

Mine pisses gas on hot days.  So does underscore's as it did a couple of weeks ago on a hot day at Hurricane Ridge.

[Inge K.]

Then I would rather believe that the gas seeks it way out via the vent pipe, which ends out inside the tank.

Inge K.

[Scott_]

Yes mine can piss gas on warm days when I have put too much into the tank.

Even more so now that I have done the "flapper-ectomy", which can allow me to put more gas in the tank.