V85TT Evap and Tip Info

[GTM®]

First service done yesterday on the GTM V85TT, which included some exploratory investigation on the inner workings. Below is info on the evap and tip valve to eliminate the fuel tank pressurization and future running issues, like all other V7/V9s.
Tank removal is fairly easy. Under the key cover is two front bolts, and one in the rear, unplug the connectors/fuel lines, and off it comes. Info on the SAS Kit is HERE (which is also the same as the V7/V9s.)

1. Key cover, one bolt on each side, slide forward and lift.



2. This exposes the two tank bolts (one shown missing below), and the grey/green valve is the infamously notorious tip-over valve:



3. Fuel line and rear tank bolt arrowed:



4. L to R, fuel pump connector, breather/overflow and fuel line disconnect. For the fuel line, slide the yellow safety clip back, and depress the white tabs on each side with your fingers, and wiggle off. These all can be done prior to tank removal via easy access under the tank frame mount bracket shown.



5. With the tank removed looking forward, the tip valve shown apart and gutted (use heat from a hair dryer or eq, and a small screwdriver to pop apart, then can be snapped back together), and red arrow is the evap can. For E4 models, the line partially hidden (white arrowed) below can be removed and plugged with a bolt or eq. For E5 models, see below.



6. E5 models, It is recommended to remove the line below from the Bosch valve, and plug with a bolt or eq. The valve should remain in place/plugged in and the valve end left open to the atmosphere.

 

[exit27]

Thanks for the info but, What problems can happen If it stay as a factory ?

 

[Jayell]

Hi Todd!

I was going to remove my tank tonight to facilitate installation of straps for a tank bag. I got everything disconnected except for the tip over valve. I tugged on it, but stopped when I saw no progress and figured I was going to break it. It looks as if you've split your valve in half? I didn't think of that. Is the valve then simply pressed back together?

I also considered breaking the clamp at the evap can and then putting it back together with a tie strap, but thought perhaps I should leave well enough alone.

My tank has the pressurization problem you mentioned. There's a distinct whoosh of air when the tank is opened. So, I should nip and plug the line you've mentioned above?

BTW, I got my straps installed simply by lifting the tank.

Thanks a lot!

 

[Uncle Tony]

I also considered breaking the clamp at the evap can and then putting it back together with a tie strap, but thought perhaps I should leave well enough alone.

This is basically what I did when removing the tank though the hose lifted off the evap can easily with a gentle pry from a screwdriver.

 

[Trout]

Thanks for the info but, What problems can happen If it stay as a factory ?

Annoying things.
Basically what happens is the tank does not vent properly which causes a fuel issue.
I had a California Black Eagle that would "run out of gas" until I opened the fuel cap.
Did the above fix & never had the problem again.

 

[exit27]

Annoying things.
Basically what happens is the tank does not vent properly which causes a fuel issue.
I had a California Black Eagle that would "run out of gas" until I opened the fuel cap.
Did the above fix & never had the problem again.

Ok, thanks.

I until now I don't feel nothing of that. Yes, it's correct that is there overpressure, in my bike this issue distorts remaining mileage.

I know that some people have asked to Piaggio about this overpressure, the answer of the brand is that isn't an issue.

But I'll keep that in mind,

 

[GTM®]

I know that some people have asked to Piaggio about this overpressure, the answer of the brand is that isn't an issue.

Incorrect... it's that they don't know how to resolve it with their constraints. There is decades of evidence as to why this is very bad for the fuel system and tank.

It looks as if you've split your valve in half? I didn't think of that. Is the valve then simply pressed back together?

Yes, well covered in this section. A little hair dryer heat and a small screwdriver to pop it apart, and snap it back together.

 

[exit27]

Incorrect... it's that they don't know how to resolve it with their constraints. There is decades of evidence as to why this is very bad for the fuel system and tank.

Ok, So I understand that cut the evap line signed by white arrow or disconnect it it's enough, yes ?. It doesn't necessary sealed of evap line cutted and evap can ?

 

[Michael Heathman]

Got the block off kit for the secondary air injection installed last weekend. The front bolt on the right cover is a bear to get to, due to the brake line coming off the ABS controller right in front of it. Got the evap canister taken care of as well.
Any progress on the fueling? Mine needs help at low rpm/throttle openings.

 

[Jayell]

Disconnect the purge line? Is that correct?

Thanks!

 

[Bisbonian]

New V85 is a week old. On the way home I noted some pressure escaping when I opened the tank to fill up, but not too bad. Fast forward to Saturday in Tucson, bike sitting in the shade but temps getting hotter than I'd seen since getting the bike. I filled up on the way home and was greeted with a loud whoosh along with a lot of expelled fuel mist as I opened the lid.

At the moment I'm unsure of my local dealer and would like to not make changes noticeable in the event of a service.
Will the simple removal/gutting of the topover valve fix this problem? In the past I've removed the canister as well, but as I'm unsure of my local dealership I'd prefer to leave that in place. I could always cap the vacuum line on the throttle body and then hook it back up if needed, just making sure removing the check valve will not cause extra strangeness if the canister is left hooked up.

 

[kiwi dave]

Was the gas escaping or filling a vacuum in the tank? Mine was doing the later.

 

[Bisbonian]

Was the gas escaping or filling a vacuum in the tank? Mine was doing the later.

The gas blew up and out of the tank in a vapor, it was more pressurization than a suck.

 

[GTM®]

Will the simple removal/gutting of the topover valve fix this problem? The gas blew up and out of the tank in a vapor, it was more pressurization than a suck.

Based on above, it should, but blow air (via mouth) through the evap canister to be sure there’s no pinched lines or a clog.

 

[Bisbonian]

Based on above, it should, but blow air (via mouth) through the evap canister to be sure there’s no pinched lines or a clog.

Will do, thanks!

 

[Bisbonian]

Have I missed where someone has explained how the quick-connect for the fuel line works?
It looks nothing like the one on my 1200 Sport, which I hated, and all the instructions just say to disconnect.

 

[kiwi dave]

I've done it several times, a different connector but same principle. Run motor, disconnect fuel pump power, and wait until motor stumbles and dies. Then press the button in the quick connector and it should release.

It's been a while, so my memory ain't what it used to be, but I think this fairly accurate.

 

[Bisbonian]

I got it sorted, you have to pull that yellow thing back to uncover the little white buttons. Squeeze the little white buttons, hold your mouth just right, and the fuel line comes apart.

 

[Uncle Tony]

I got it sorted, you have to pull that yellow thing back to uncover the little white buttons. Squeeze the little white buttons, hold your mouth just right, and the fuel line comes apart.

Easier said than done if the connector face with a little white button is facing the tank. I'll be replacing with a metal one later in the year.

 

[Michael Heathman]

Easier said than done if the connector face with a little white button is facing the tank. I'll be replacing with a metal one later in the year.

Do you have a source or part number for the metal fitting?