Catch Can & Check Ball Nonsense

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MaverickiB said:
Recall was done when it came out and not long after, I replaced the entire gas cap assembly with a different one. I did not reuse any of the breather assembly. Still never any leakage except when I accidentally overfilled once or twice.
Click to expand...

What gas cap do you have? All the ones I see re-use the lower half.
 
The Lightec gas caps are pretty much one the only ones that don't use any of the oem pieces. I don't know why people install a billet gas cap over on top of the junk plastic lower half it doesn't even vent properly.
 
Dont overthink it, catch cans have been on racing bike since day dot. People use all kinds of bottles, basically it's whatever you can find that fits, run hoses. For the occasional track day I wouldn't bother, and a few drops of gas on the ground isn't a big deal, maybe it's being overfilled?
 
I will look into the Lightec, thank you!

Searching the forums here and on Google using "ducati panigale gas tank overflow breather" there were dudes on the xx99 bikes having similar problems. With the V4 I think its a different problem with the same symptom, fuel dribbles.

From the 2018 recall.

1653618950336.png


From a 2019 recall. Both of these recalls were meant to address fuel spraying from the gas cap when opening it. Which is a pressure problem from an inadequate EVAP system. I suspect the design of the V4 fuel tank would allow forward sloshing fuel under hard braking to enter the overflow and/or breather tubes but when the tank was designed, there were all of the implements pictured in the 2018 recall snapshot present. All of those implements were removed without addressing the internal design of the tank, cause profit.

1653619034774.png
 
Paul G said:
Dont overthink it, catch cans have been on racing bike since day dot. People use all kinds of bottles, basically it's whatever you can find that fits, run hoses. For the occasional track day I wouldn't bother, and a few drops of gas on the ground isn't a big deal, maybe it's being overfilled?
Click to expand...

Not being overfilled and I don't want to get flagged. LOL

I got a fuel resistant catch bottle to install, but I'd rather address the problem at the source. I think its all related to mitigating tank pressure because Ducati's EVAP solution sucks. Well, it is insufficient for the amount of heat which gets pumped into the V4's gas tank.

I have noticed after rides with aggressive braking the lower faring ports rearward have dried gas. It shouldn't be happening. There's no reason I can think of that if you accelerate to 40 MPH and make a max effort stop there should be drips of gas from the overflow line, regardless of tank volume. On a track there'd be way more high effort stops from greater speeds to suitable turn in speeds. The impetus of this thread was a track rider on another forum getting flagged.
 
I'd prefer to keep it under the fairings but that does look like a generic overflow bottle. I saw a few online but they seem to be overpriced for a random plastic jug.
 

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