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Unread 03-22-2008, 04:25 AM   #1
meater
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liquid check = rollover check???

Soooo,

i need to replace my liquid check valve. George's seems to be the only answer to this fix (aside from plugging the hoses).

According to him:

the liquid check valve is no longer in circulation.
the rollover check valve does the same thing as the liquid check valve.
the fix: install two rollover check valves in place of the LCV & original RCV.

My problem with that answer:

It is my understanding that the liquid check valve behaves differently from the rollover check valve. They are not the same valve.

My question:

Can I replace my LCV and RCV with one RCV and have my system run smoothly?

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Unread 03-22-2008, 07:51 AM   #2
Bard
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Well I needed new seals for my 20 gallon tank and during the inspection, I saw one of the rollover checkvalves was cracked, so I decided to replace both of them. I went to the dealer to see if they had them. It turned out when you type in 1985 CJ7 they were discontinued, when I told the parts guy to write down the number and crosscheck it with a 1994 Wrangler YJ, they are the same part numbers. I didn't think about the liquid check valve, but I am sure they are close enough to the same.

Try this number at a dealership -
J319 8666 Check Valve

They are different types of valves and you can not run them like you suggested. You need the correct ones or just bypass the LCV.
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Unread 03-22-2008, 08:13 AM   #3
BESRK
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They serve different purposes. The roll over valve closes when the vehicle is upside down. The liquid check valve closes when it fills up. It works more like a carburator's float system. It has a needle/seat in it. It stops fuel from leaking out the vent line during off camber situations (like steep climbs). I took one of these magic valves apart a couple weeks ago.. just had to see what made it tick.
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Unread 03-22-2008, 09:43 AM   #4
Mike Romain
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I have only been using the roll over valves in the tank and have my canister relocated up by my brake master to keep it's air filter out of the mud. I run sand pit and ravine walls and haven't had any gas getting to my canister, well no fumes anyway. I also have had it rubber side up sideways twice on the canister side and had no gas leaks.

Maybe I have been lucky or just don't overfill my gas tank or just don't run steep stuff with a full tank? Or maybe my raised canister does the trick?
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Unread 03-22-2008, 12:29 PM   #5
jscherb
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Jeep discontinued the use of the liquid check valve after the CJ - the YJ only has the rollover check valve. I believe in the YJ they are mounted on top of the tank, just like in the factory 20-gallon option on the CJ.

Seems to me as long as the rollover check valve is mounted high enough above the top of the tank to prevent liquid fuel from flowing through in high-angle situations, you might decide to run without the liquid check valve, just like the YJ, although you should know what your local emissions and inspection regulations are before making any changes to the system.

Don't run without the rollover check valve, especially if you drive off-road and are at any risk of rolling over.
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Unread 03-22-2008, 12:34 PM   #6
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and I have this for sale also if needed
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Unread 10-29-2015, 11:22 PM   #7
258
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Cj

Quote:
Originally Posted by BESRK View Post
They serve different purposes. The roll over valve closes when the vehicle is upside down. The liquid check valve closes when it fills up. It works more like a carburator's float system. It has a needle/seat in it. It stops fuel from leaking out the vent line during off camber situations (like steep climbs). I took one of these magic valves apart a couple weeks ago.. just had to see what made it tick.
Hi, I am pretty hands on. Can I rebuild the LCV in some way? Is it problematic to open it up to do this?
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Unread 10-30-2015, 03:08 AM   #8
Matt1981CJ7
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Quote:
Originally Posted by 258 View Post
Hi, I am pretty hands on. Can I rebuild the LCV in some way? Is it problematic to open it up to do this?
You may get more responses if you start a new thread, instead of resurrecting a 7 year old one.

Matt
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Unread 10-30-2015, 05:56 AM   #9
keith460
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Quote:
Originally Posted by 258 View Post
Hi, I am pretty hands on. Can I rebuild the LCV in some way? Is it problematic to open it up to do this?
Comes apart easy as long as you are gentle with prying the top lid off. I had taken mine apart as well to clean it out of old gunk that might have been in there and it was easy. Just be careful you don't damage any of the inside components are LCV are as rare as fine art.
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Unread 10-30-2015, 07:42 AM   #10
Ken4444
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This post in my build thread has several photos of what to expect if you open the thing up.

As Keith mentioned, it's not difficult to open if you are gentle with it and understand how it fits together.

Here are a couple of photos from that post:



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Unread 10-30-2015, 09:22 AM   #11
Mortgage-payer
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Option 2:
Buy the all in one replacement from MTS;

http://www.mtscompany.com/miscjeep.htm

I've been happy with mine.
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Unread 10-30-2015, 09:34 AM   #12
texasdave
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^^^^^MTS has them
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Unread 10-30-2015, 10:17 AM   #13
Matt1981CJ7
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Quote:
Originally Posted by Mortgage-payer View Post
Option 2:
Buy the all in one replacement from MTS;

http://www.mtscompany.com/miscjeep.htm

I've been happy with mine.
Hmm...not sure what you mean by "all in one".

The MTS diagram shows 2 different parts for the LCV and RCV.

Matt
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Unread 10-30-2015, 11:19 AM   #14
258
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Cj 20 Gallon - valves

Quote:
Originally Posted by keith460 View Post
Comes apart easy as long as you are gentle with prying the top lid off. I had taken mine apart as well to clean it out of old gunk that might have been in there and it was easy. Just be careful you don't damage any of the inside components are LCV are as rare as fine art.
AWESOME, I can do it! Exactly what, if anything, do I need to replace inside . . . or just do a THOROUGH cleaning of those internal parts?

Do you recommend replacing the Emission Valve at tank top or simply blowing it out with air? There are TWO valve's up there right? Should I NOT touch the EMV and/or should I at least replace the 2 grommet's? I believe they are both the same grommet.
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Unread 10-30-2015, 11:25 AM   #15
258
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Cj

Quote:
Originally Posted by Ken4444 View Post
This post in my build thread has several photos of what to expect if you open the thing up.

As Keith mentioned, it's not difficult to open if you are gentle with it and understand how it fits together.

Here are a couple of photos from that post:



Great images, THANKS!

So, is their junk inside it when it is first opened? Does that center rubber coin-shaped piece need replacing?
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