Gas Tank Pressure

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Ducati Dreams

Ducati Dreams

Joined
Apr 3, 2012
Messages
175
Location
NM
After a ride in temps around 100 degrees Fahrenheit I pulled into my garage and let her cool down for a few minutes. I then opened the gas cap and wwwwoooooosssshhhhhhh. My hair literally got blown back and it caused me and a buddy to jump a bit as the sound was rather loud and unexpected.

I have never had a tank build so much pressure before... a little worrying if you ask me or is this more typical with dukes?

Surely this can't help the hot starting issues.

Earlier on in the day when we stopped for lunch I was able to find a shady parking space, when I returned about 30 min later she fired right up without a problem; when I have parked in the sun before I have noticed that she is really hard to start.
 
Ducati Dreams said:
After a ride in temps around 100 degrees Fahrenheit I pulled into my garage and let her cool down for a few minutes. I then opened the gas cap and wwwwoooooosssshhhhhhh. My hair literally got blown back and it caused me and a buddy to jump a bit as the sound was rather loud and unexpected.

I have never had a tank build so much pressure before... a little worrying if you ask me or is this more typical with dukes?

Surely this can't help the hot starting issues.

Earlier on in the day when we stopped for lunch I was able to find a shady parking space, when I returned about 30 min later she fired right up without a problem; when I have parked in the sun before I have noticed that she is really hard to start.
Click to expand...

Remove the charcoal canister - It prevents overexpansion of pressure in the tank. No adverse effects - Takes 20 minutes
 
Ducati Dreams said:
If it prevents overexpansion of pressure wouldn't I want to leave it on?
Click to expand...

Sorry - what I meant was when you remove the canister it prevents over expansion. The tank just breaths through the breather hose vs. going into the canister which has a pressure valve that directs the vapors into the intake.
 
lose the charcoal cannister. I left mine on my streetfighter on a road trip pressure built up so high it split the paint on the tank. Ducati replaced.

Unlesss you live in Calif. then you have to leave it on.
 
zvez said:
lose the charcoal cannister. I left mine on my streetfighter on a road trip pressure built up so high it split the paint on the tank. Ducati replaced.

Unlesss you live in Calif. then you have to leave it on.
Click to expand...

Good advice....first item removed from my Ducs!
 
no adverse effects except your garage will constantly smell like gasoline or your kitchen if you are a single dude ;)
 
line from canister to the airbox closed :
2012-06-18_18-41-34_794.jpg


line from the tank extended (with blue hose) to the outlet:
2012-06-18_18-41-18_899.jpg


cut outlet to avoid clogging:
2012-06-18_18-43-56_906.jpg
 
zvez said:
lose the charcoal cannister. I left mine on my streetfighter on a road trip pressure built up so high it split the paint on the tank. Ducati replaced.

Unlesss you live in Calif. then you have to leave it on.
Click to expand...


I wonder how the California residents are dealing with this issue? Is the canister something that is inspected during registration?
 
neroon said:
There are no bike inspections in California, yet...
Click to expand...

That's good. I am almost 100% sure that without a physical inspection that they would not be able to know if the bike did not contain a canister.

Question for you Phil: before you extended your line from the tank (when the canister was still installed) did the rubber hosing run all the way to the cutout underneath the bike? I was inspecting mine and noticed the tube running from the bottom of the canister doesn't go all the way to that cut out hole, it stops a few inches short and is just clasped next to the coolant line.
 
Hi Phil, My bike does the same thing. After a long ride, I stop at a Gas station to load fuel...I get a "whooooosh" pressure from the gas cap.

I guess whether its a U.S. Version or a Euro Version we all get the same bikes...

Would you have a step by step procedure on how to lose or cut the Charcoal Canister line from the system? Saw the photos above but wasn't sure what I should do?

Questions:

1.Do I just clamp the black hose/line from the canister to the airbox? How will I know that line comes from the canister and is connected to the airbox...will it be visible if I take a look with a flashlight?

2. How will I know the other line is from the gas tank? That's what I will extend just what you did with a blue hose? Right?

3. By doing these, will the high pressure finally be eliminated?

Hope you can help out.

Thanks Phil.

Miguel
1199 S w/abs
Manila, Philippines.
 
Last edited:
Ducati Dreams said:
That's good. I am almost 100% sure that without a physical inspection that they would not be able to know if the bike did not contain a canister.

Question for you Phil: before you extended your line from the tank (when the canister was still installed) did the rubber hosing run all the way to the cutout underneath the bike? I was inspecting mine and noticed the tube running from the bottom of the canister doesn't go all the way to that cut out hole, it stops a few inches short and is just clasped next to the coolant line.
Click to expand...

i don't remember ... sorry.and the cut out hole in the bottom is wrong, it's for fixing the fairing.
 
mig1199 said:
1.Do I just clamp the black hose/line from the canister to the airbox? How will I know that line comes from the canister and is connected to the airbox...will it be visible if I take a look with a flashlight?

Answer 1: I opened the gas cap and blew through the lines to find out, held the hand above the tank inlet.

2. How will I know the other line is from the gas tank? That's what I will extend just what you did with a blue hose? Right?

A2: yes, tank line extended to the bottom and airbox line closed.

3. By doing these, will the high pressure finally be eliminated?

A3. couldn't detect any pressure at all.
Click to expand...

but it's all also listed here:

http://ducati1199.com/mechanical-technical/886-charcoal-emissions-canister.html


Good luck,

Phil
 
Removing the canister WILL eliminate the WHOOSH sound on opening the tank after riding.

Also, you can remove the canister in two ways. One is to leave the hoses to the throttle bodies in place capped off, or elminate the hoses on the throttle bodies by capping the ports on the TBs.

I always do the easy way one because it's easy, and leaving the hoses in place makes it relatively easy to put the canister back in place should road lawas require it.
 

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