liquid check = rollover check??? -
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Unread 03-22-2008, 03:25 AM   #1
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1981 CJ8 
Join Date: Sep 2007
Location: Delaware
Posts: 170
liquid check = rollover check???


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, 06:51 AM   #2
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1985 CJ7 
Join Date: Oct 2005
Location: The Granite State
Posts: 2,662
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.
85' CJ7 Laredo, 383 GM, Turbo 350, NP 203. SOA, 2" frame lift, 34" TSL swampers, Dana 30 open, AMC 20 w/ detroit locker, 4:10's, 1 Piece Mosers, 35" boggers to abuse when needed.
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Unread 03-22-2008, 07:13 AM   #3
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1980 CJ5 
Join Date: Nov 2002
Location: Newport News, VA
Posts: 12,284
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.
'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..

Lower 2


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Unread 03-22-2008, 08:43 AM   #4
Mike Romain
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1986 CJ7 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 16,546
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?
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 03-22-2008, 11:29 AM   #5
Web Wheeler
2006 LJ Wrangler 
Join Date: Mar 2007
Location: Elmira, NY
Posts: 9,158
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, 11:34 AM   #6
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1978 CJ7 
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and I have this for sale also if needed
1978 cj-7 had since 1979
401 .030 over- full floating flat top pistons
crower solid cam 292 dur .500/.510 lift
turbo 400 tranny 2500 stall
model 20 transfer case
aj delux glass body
4" lift
dana 30 frount
dana 44 rear
4.56 gears
13.461 @ 92.45 mph on 37" super swampers on 1/4 mile
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