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  Topic Review (Newest First)
06-21-2019 10:12 AM
Matt1981CJ7
Quote:
Originally Posted by ghostrder 04 View Post
Hay Matt found the problem some one capped off the top of the LCV causing the tank to vent back into it's self now to search for a new LCV or bypass this one for now .......
Good for you. Glad we could help.

The OEM style LCVs and RCVs are no longer available. Google a company called MTS for suitable replacements.

Matt
06-21-2019 10:12 AM
ghostrder 04 No but i am looking in to joining some jeep clubs where are you located ??
06-21-2019 09:59 AM
ddawg16
Quote:
Originally Posted by ghostrder 04 View Post
I'm in Mendocino county ca. found the problem at some point the nipple on the top of the LCV broke so they put a screw in it causing the tank to vent back into its self thank you for your reply
Glad you found the issue.

Have you done the Dusy yet? I want to do it again next year.
06-21-2019 08:25 AM
ghostrder 04 Hay Matt found the problem some one capped off the top of the LCV causing the tank to vent back into it's self now to search for a new LCV or bypass this one for now .......
06-21-2019 07:58 AM
ghostrder 04 I'm in Mendocino county ca. found the problem at some point the nipple on the top of the LCV broke so they put a screw in it causing the tank to vent back into its self thank you for your reply
06-20-2019 03:36 PM
ddawg16
Quote:
Originally Posted by ghostrder 04 View Post
Yes you are you are right Matt what i meant was the caps are closed not vented i will try and fix it checking for the hoses or canister being clogged like you suggested but i will also be getting a vented cap for back up before i head out there to check the system
What state are you in?

A vented cap is ok for backup, but I wouldn't want to run it like that all the time. Need to find your problem.

If you can, take a pic of the drivers side of your engine compartment and post it.
06-20-2019 08:54 AM
ghostrder 04
ghostrder04

Yes you are you are right Matt what i meant was the caps are closed not vented i will try and fix it checking for the hoses or canister being clogged like you suggested but i will also be getting a vented cap for back up before i head out there to check the system
06-20-2019 08:31 AM
Matt1981CJ7 The fuel systems on a Cj are not an air-tight system. The tank should never build pressure.

A while back, I was fueling up at a gas station, when a fellow CJ owner pulled up to the pump beside me. When he removed his gas cap, I heard a loud "whoosh" of pressure being released. When I politely mentioned to him that he had a venting problem, he responded irritably and said "that's normal." I just shook my head and continued with my business.

You can lead a horse to water.....

Matt
06-20-2019 08:06 AM
ghostrder 04
ghostrder 04

Thank you Matt I will check that everything you mention is clear yes i do have a non venting gas cap its oem what the book calls for it is a closed system but i will be looking for a vented one today thanks again.
06-20-2019 07:50 AM
ghostrder 04
ghostrder 04

i took it off to relieve the pressure and i put it back on when it started because I had a near full tank of gas and didn't want to drive down through the national forest with the cap off in the heat of the day during fire season spilling gas on the jeep road .
06-20-2019 07:38 AM
Matt1981CJ7
Quote:
Originally Posted by ghostrder 04 View Post
No Changes it was smog checked and passed before i bought it last year it runs fine around the valley i just made the first trip to th mountain's and started having this problem

Remove the vapor canister and check the filter on the bottom of the can. When they get clogged with road grime, they will cause venting problems.

Beyond that, you are going to have to confirm the vent lines from the tank to LCV, and from RCV to canister, are clear, and that your LCV and RCV are functioning properly.

You should also pick up a venting gas cap. It sounds like you have a non-venting one now.

Matt
06-19-2019 09:29 PM
ddawg16 If I'm reading your post correctly, you put the gas cap back on each time?

What made you take if off in the first place?

I would have left it off if I suspected a vent issue.
06-19-2019 07:46 PM
ghostrder 04
ghostrder 04

No Changes it was smog checked and passed before i bought it last year it runs fine around the valley i just made the first trip to th mountain's and started having this problem
06-19-2019 03:46 PM
ddawg16 What have you done to the jeep? Any changes?
06-19-2019 02:56 PM
ghostrder 04
ghostrder 04

yes i see in the manual they should go to a limit fill valve but in looking at it it looks like it goes straight to the charcoal canister
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