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2020 KRX
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Could it be possible the fuel gauge got damaged from prolonged tank pressure?
Mine was inaccurate until I put in the roll over vent. Now my gauge works as it should.
It definitely could be. I’m not sure if the tank has a “float sensor” to monitor fuel capacity, but an over pressurized tank would effect that working properly.
 

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Got mine in too, just have to install it. Does it matter which way the valve is installed?
Yes it does. There should be instructions with the valve. It must be mounted vertically. I think the big end goes down, if I recall correctly. If there are no instructions, you can figure it out by blowing through it. Hold it vertical and blow through the top. If no air goes through, that is the bottom. That would simulate a roll over situation, and not allow gas to escape.
 

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So here’s a pic of what I’ve got going on under the cover. I understand that the black canister is the valve, but as you can see it feeds over to a white canister, then back down. I have no idea where it goes from there, but it doesn’t vent to the outside like others do. So I’m wondering if I can even replace it without screwing something up??

1887
 

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So I dove a little deeper (I’m tearing apart my car anyway to do a communications install) and found where everything goes.
It goes from the first white canister after the one way valve down to the big canister underneath the bar.
1889

From there it comes out the other side of that canister into another small white canister seen on the right side of the bar.
1890

Then heads back up and out to the frame like the rest of them do. But also there is a second hose that comes off the back of the big canister and runs to that solenoid you see on top of the bar, and then out and up following the other vent hose to god knows where.
So at this point I don’t even know if installing that valve would do anything.
 

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So that's what the blue pigtail is for under there. Damn Cali and all their emissions standards. That's a bunch of crap you have under your console. That's all just empty space under mine, with the blue plug just hanging out all alone and nothing to plug into.
 

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So that's what the blue pigtail is for under there. Damn Cali and all their emissions standards. That's a bunch of crap you have under your console. That's all just empty space under mine, with the blue plug just hanging out all alone and nothing to plug into.
If I knew for sure it wouldn’t cause any computer errors, I’d rip all that crap out of there, and just connect the gas tank vent hoses directly to the main vent hose. (With the new valve installed of course)
 

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I don't know how it would react to you doing that. You could probably just unplug it and see what happens. If it doesn't like it you would probably know pretty quick. Tough call. I heard that VF John has a different flash for Cali models, so I would guess you kind of need all that plugged in for the ECU to be happy.
 

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Mine had a bad vapor lock it's a 2020 Cal/50 state model. I added the Tanks Inc. from RCOR (see link below) if yours is vapor locking when you unscrew the gas cap I would add it. Like has been said if your doing it for gas read out accuracy not sure if your going to see any improvement as I can't tell on mine.
You replace the same stock vent/one-way plastic value piece as the non Cal/49 state models.
I removed like 1/2" of the tubing from the top because the new roll over valve is a bit longer. I left all the other Cal vent tubing and what I'm guessing is a charcoal filter in the setup on my KRX.

Mount it just like the picture shows narrower end down.

 

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Unfortunately it looks like the Tanks Inc Rollover Valve is out of stock.
These looks like the same piece but with a addition vent cap that you won't need.



 

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These looks like the same piece but with a addition vent cap that you won't need.



Awesome, appreciate the find.
 
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