'99 M900 Fuel Tank Vent Line (?) Length - Ducati Monster Forums: Ducati Monster Motorcycle Forum
 
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post #1 of 5 (permalink) Old 08-02-2019, 02:15 PM Thread Starter
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Question '99 M900 Fuel Tank Vent Line (?) Length

Hi -
I am working on a '99 M900 and there is a line that comes out of, and returns to, the underside of the fuel tank. I am not sure what it is, but maybe a vent line of some type? It is VERY long and gets in the way and dangles all over the place. Can someone tell me what this line is for and if there is any reason I can't shorten it? If I can shorten it, how short can I make it? If not, are there any other ideas for how to keep it out of the way and be a bit neater?

Images attached, the line in question is traced in light blue.

Unfortunately the only manual copy I can find for this year has massive pieces of it missing, so if anyone has a complete copy please message me!
Thanks in advance!
Patrick
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post #2 of 5 (permalink) Old 08-07-2019, 08:34 AM
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It seems that some one has simply connected the two vent lines together.
These look like the fuel vents from the filler cap, one for actual venting of the tank and one for overfill situation.
Both of these should be separate and fall behind frame and right hand footpegs etc. ending out the bottom of bike to direct fuel overfill or access to the ground.

Later 900's had a 'y' piece connecting them together and a single tube directed to ground.
Pm me if you want a complete manual, I will try to show a picture of these pipes, you can see they just go down and hang below pipes etc. not very clear.
hope this helps.
Labled 'b' on diagram, they connect to internal tank tubes to filler cap.
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Last edited by ronski; 08-07-2019 at 08:38 AM. Reason: added lable.
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post #3 of 5 (permalink) Old 08-08-2019, 02:41 PM Thread Starter
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Yes, I see what you mean with the picture, thank you! This is very helpful and gives me some direction on getting it corrected. It will be nice to not have that massive piece of tubing looped under the seat. Maybe it will also help the bike run better. PM sent regarding the manual.
Thanks again!
Patrick
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post #4 of 5 (permalink) Old 08-08-2019, 07:21 PM
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Also, the pipe you have is way too thick, it's only a vent. Something similar to say, windscreen washer tubing should be better, and tucks out of way easier.

Have sent you some manuals etc.

Cheers,
Ron.

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post #5 of 5 (permalink) Old 08-20-2019, 09:23 AM
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Quote:
Originally Posted by Charliecharles View Post
Hi everyone, I always loved Ducatis first of all I think they are the epŪtome of two wheels motorbikes, saying that I've talked with several people that are gently trying to get me out of the thought of getting one, I say I really nice deal on a M600 from 96 for around 3000, prices here are not "user friendly" like most countries, and it's a dream bike for my first BIG BIKE, I'm asking the community so what should I look for on a used M600 from 96 what pro and cons I must consider and also what should I replace if it's a good shape here are some pictures of the bike.
Hi Charlie, welcome.
You posted this question as a reply to a "'99 M900 Fuel Tank Vent Line" topic, so people may not see it. Try posting as a new thread. No pictures were posted, either. By the way, my 19 year old M900 has never let me down. Great bikes!
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