Ducati Monster Forum

Moto Board => Tech => Topic started by: Howley on February 10, 2012, 04:28:22 AM

Title: '94 M900 - Tank Vent Hoses
Post by: Howley on February 10, 2012, 04:28:22 AM
Hi All,

I have two vents coming out the bottom of the tank on my '94 M900.
I'm guessing one is overflow and one is a vent, so I'm guessing I can splice the overflow into the carb overflow, and leave the vent alone. Is this true?
Am I able to splice these both into a single hose?

Thanks!

Luke
Title: Re: '94 M900 - Tank Vent Hoses
Post by: ducpainter on February 10, 2012, 04:30:34 AM
If you have no charcoal canister you van use a Y connector and splice them together.
Title: Re: '94 M900 - Tank Vent Hoses
Post by: Howley on February 10, 2012, 05:06:08 AM
Excellent. And I can splice them into the carb overflow?
Title: Re: '94 M900 - Tank Vent Hoses
Post by: battlecry on February 10, 2012, 05:56:56 AM
If you do, it may complicate removing or lifting the tank.
Title: Re: '94 M900 - Tank Vent Hoses
Post by: ducatiz on February 10, 2012, 06:17:04 AM
tank overflow is non-pressurized

putting it onto the carb return will pressurize it in the wrong direction.

the vent hose should just hang loose.

I took the charcoal canister off (Howley is in Oz right?  No canister there) and ran both below the bike.

Title: Re: '94 M900 - Tank Vent Hoses
Post by: Howley on February 10, 2012, 07:43:32 AM
Which is the vent and which is the overflow?
Title: Re: '94 M900 - Tank Vent Hoses
Post by: ducatiz on February 10, 2012, 08:01:43 AM
Quote from: Howley on February 10, 2012, 07:43:32 AM
Which is the vent and which is the overflow?

Usually there is a sticker on the bottom of the tank showing the orientation.  I don't have that bike so i can't tell, but usually the one nearest the rear is the vapor line and the one towards the front is the overflow.
Title: Re: '94 M900 - Tank Vent Hoses
Post by: ducpainter on February 10, 2012, 05:30:54 PM
Quote from: Howley on February 10, 2012, 07:43:32 AM
Which is the vent and which is the overflow?
Pretty sure the overflow/cap area drain is the one closest to the outside of the tank.
Title: Re: '94 M900 - Tank Vent Hoses
Post by: Nomad on February 10, 2012, 10:00:59 PM
I'm not recommending this, but now I'm curious.  In the process of putting in my FCR's, I for some reason removed both those hoses.  I haven't experienced any ill effects, am I just lucky or is it not a big deal?
Title: Re: '94 M900 - Tank Vent Hoses
Post by: Howie on February 10, 2012, 10:05:37 PM
Quote from: Nomad on February 10, 2012, 10:00:59 PM
I'm not recommending this, but now I'm curious.  In the process of putting in my FCR's, I for some reason removed both those hoses.  I haven't experienced any ill effects, am I just lucky or is it not a big deal?

The job of the hoses is to keep fuel from dumping on your engine if you spill while fueling or fuel comes out of the vent hose from expansion.  No overfolw or expansion, no problem, but...
Title: Re: '94 M900 - Tank Vent Hoses
Post by: Nomad on February 10, 2012, 10:25:21 PM
Quote from: howie on February 10, 2012, 10:05:37 PM
The job of the hoses is to keep fuel from dumping on your engine if you spill while fueling or fuel comes out of the vent hose from expansion.  No overfolw or expansion, no problem, but...

Gotcha, I'll be careful and not top it off completely... or find some hoses that fit
Title: Re: '94 M900 - Tank Vent Hoses
Post by: Howley on February 10, 2012, 11:36:06 PM
Correct howie and ducatiz.. I blew into the outer-most outlet, air came out the overflow drain.
Title: Re: '94 M900 - Tank Vent Hoses
Post by: Real Recognize Real on February 14, 2012, 07:23:25 PM
Quote from: Nomad on February 10, 2012, 10:25:21 PM
Gotcha, I'll be careful and not top it off completely... or find some hoses that fit

This is my scenario (FCRs and removed hoses) but I'm going to reinstall the vent and overflow hoses. Btw - what size are these hoses?
Title: Re: '94 M900 - Tank Vent Hoses
Post by: ducatiz on February 14, 2012, 07:34:38 PM
6mm i think, but you better just check.
Title: Re: '94 M900 - Tank Vent Hoses
Post by: Howley on February 15, 2012, 12:59:12 AM
Yep 6mm.