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V85TT Evap and Tip Info

Michael Heathman said:
Do you have a source or part number for the metal fitting?
Click to expand...

No I don't, but google "motorcycle quick release fuel line coupler" brings up many choices and I'm sure Touratech will do them.

I really wasn't impressed with the OE connector, I was expecting it to break the first time I tried to separate the line. The position of the connector against the tank side made depressing little white tab difficult.

Does anyone know the internal dia of the hose?
 
I got the tank off today, disconnected the hose to the check valve and put the tank on the ground.
Now I hear a high pitched noise, it's the air slowly releasing from the tank. It sounds like there's some sort of restriction in the hose between the tank and the check valve.
I open the gas cap and there is a bit of pressure still in there.
Normal?
I blew into the hose and there didn't seem to be any restriction, but the gas cap was open.
 
There's a one-way valve in the circuit, similar to previous, except made from plastic. On other models, I've used a bit of hot water to open these up and remove the innards, but the V85 one was a bit more reluctant to cooperate.

So I removed it, and when I overfill, I see fuel on the ground. Not good, must have another go.
 
kiwi dave said:
There's a one-way valve in the circuit, similar to previous, except made from plastic. On other models, I've used a bit of hot water to open these up and remove the innards, but the V85 one was a bit more reluctant to cooperate.

So I removed it, and when I overfill, I see fuel on the ground. Not good, must have another go.
Click to expand...

The one-way valve is the grey/green thing Todd shows in the first post, right?
If so, I disconnected that and just had the hose coming from the tank, tank sitting on the ground and still getting pressure in the tank.
 
That's the one. I did mine before Todd posted his excellent tutorial.

But it sounds. like you have a blockage somewhere. Have you tried poking a thin wire into the tank from where the tipover valve was disconnected? From CARC days I remember this was a torturous route, so probably not achievable. But you should be able to blow air through.
 
kiwi dave said:
That's the one. I did mine before Todd posted his excellent tutorial.

But it sounds. like you have a blockage somewhere. Have you tried poking a thin wire into the tank from where the tipover valve was disconnected? From CARC days I remember this was a torturous route, so probably not achievable. But you should be able to blow air through.
Click to expand...
I was able to blow air through from the hose end, didn't try pressurized so it was just breath. I had the tank lid open and there seemed to not be any restriction blowing that way. I also blew compressed air from the hole in the tank back through and it exited well enough.

I'm wondering if it could be something in the gas cap itself. But I think first I'll take the tank back off and get a better look again.
 
vagrant said:
I'm old and old school! Just push a pin hole through with a H D safety pin.
Click to expand...
The valve has already been gutted, that's what was bugging me.

I just took the tank back off, this really is a lot easier than my 1200 Sport was.

Leaving the (gutted) valve on the motorcycle, I am able to blow and suck through it and the canister. Yes there's a bit of resistance but not too bad.

I'm also able to blow and suck through the vent hose attached to the tank. With the gas cap closed there is resistance but not too bad.

Strangely, I can "inflate" the tank a little and don't hear anything coming back out of the hose when I let it go. If I open the cap then I get a whoosh of escaping air. If I inflate the tank as much as I can by blowing into the vent hose, then I can hear a bit of air coming back out when I stop blowing.

I think everything is working as designed right now and I'm making more trouble than necessary. The temps are heating up around here so we'll see. I'm not worried too much about a bit of pressure escaping from the camp when I gas up, but the forceful blast I was getting was worrisome.

I'll check back in a couple of weeks.
 
kiwi dave said:
Might be easier just to open the gas cap itself to see if the gas cap is the issue.
Click to expand...

Do you mean take it apart? I'm not at that point yet.
If I open the cap and blow through the vent hose then there is zero restriction, that's to be expected since it's just a hose with a nipple going to a hole. I was initially worried they put some sort of restrictor in the hose, but I've moved past that.
 
Just to update. I disconnected the check valve, the hose from the tank is free to the air (at the moment) and I capped the the end of the check valve to stop any vacuum leak.

Once in a while I get a small poof when opening the gas cap but it is minimal and I'm calling this sorted. The bike has had a chance to sit out in some higher temps with mixed use and has not had any problems.

Prior to this, with everything hooked up as from the factory, it was a bit disconcerting when opening the tank to fill up with gas.
 
Both pictures have the two ends of the same line circled (1). Is this the line that gets plugged? The free line connects to the tip over valve and is labelled.

Edit: Plug with a bolt near the second picture below with a large bolt or plug. If you can remove the clamp to do so, all the better. Do NOT simply rubber cap the line on the fitting on the intake manifold below.

20200711_174510.jpg 20200711_174638.jpg
 
On a US model isn't there a concern that the small plastic tank that the two hoses attach to can fill up with fuel if the tank was filled to the brim and/or the bike was leaned over and parked in the sun? Or am I misunderstanding the operation? It seems to me that the hose from the tipover valve should be disconnected and allowed to drain, but I didn't see that mentioned.
 
Last edited:
Andrew Poe said:
What is recommended to plug the line with?
Click to expand...

I used a bolt I had that was for a Stebel Air Compressor, held in place with a clamp & then taped over. I pulled that cannister & then installed an air horn in that space

cannister.jpg


cannister_location.jpg



purge_line_1.jpg


purge_line_2.jpg


horn_location.jpg
 
I have been doing a lot of reading, and trying to learn as much as I reasonably am able.....I am puzzled by some of the reports regarding the evaporative canister system -- or -- more to the point, malfunctions of the evap canister system:

Some reports discuss a pressurized condition inside of the fuel tank -- as if the vapor component in a half-empty tank was allowed to heat up on a particularly warm and sunny day (often managed by opening the fuel cap to allow the pressure to escape).

Other reports mention a vacuum effect -- presumably caused when displacement air is not allowed to enter the tank to fill the space created when fuel is consumed.....creating a vacuum effect.

Do BOTH of these conditions potentially occur when the evap can system malfunctions?
 
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