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Author Topic: CJ7 fuel vapour venting  (Read 3568 times)

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johnnyboy

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  • Vehicle: 79 CJ7 LHD 258 owned since 1980, 79 CJ7 LHD 304 quadratrack - nuts and bolts rebuild almost done...
  • Year: 1979
CJ7 fuel vapour venting
« on: November 21, 2016, 12:30:36 PM »
Hi.


My 4.2CJ has vapour vent pipes running from the tank to a "liquid check valve" then a "rollover check valve" (both in the back left corner), then off to a charcoal canister the engine bay and then to the carburettor.....

I understand that this was mostly for 1970's California emissions laws and I would like to simplify it all... (though something to stop petrol running out if I make it fall over still sounds like a good idea...)
What do I need to do? Can I just throw it all away? What are the issues?
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djrr6

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  • Vehicle: CJ7 AMC 360 5 gear wobbly thing
  • Year: 1981
Re: CJ7 fuel vapour venting
« Reply #1 on: November 21, 2016, 06:22:32 PM »
I had same issue and read a few different rebuilds and took advice from long term owners on here and it would seem the charcoal canister and the rest is pretty much an 'addition' to suit California and can be removed

I have taken the two vents to a stainless steel roll over and then vent from that to atmosphere
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Dave The Sparky

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Re: CJ7 fuel vapour venting
« Reply #2 on: November 21, 2016, 06:52:46 PM »
 :imwitstupid: I bought a vented cap from Rock and binned all the charcoal nonsense.
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3.0TD (proper fuel) Toyota powered CJ6, 1981 4.2L "Montana" blue CJ8,1982 "Cack" Brown CJ8 slowly getting a Chevy V6 and a lot of welding...

djrr6

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Re: CJ7 fuel vapour venting
« Reply #3 on: November 21, 2016, 07:47:15 PM »
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Dave69

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Re: CJ7 fuel vapour venting
« Reply #4 on: November 23, 2016, 10:16:21 PM »

got none of that stuff on my jeep.

YJ filler neck with the screw filler cap waiting to be swapped over should stop the smell of petrol when you accelerate with a full tank of fuel
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XJ 2.5 diesel - dead. XJ 4.0 6" lift - sold to some lucky person
CJ7 4.2 auto standard(ish)
Alfa 147 jtdm
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