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Unread 03-21-2011, 04:49 PM   #1
Registered User
1994 YJ Wrangler 
Join Date: Sep 2010
Location: Wedgefield near Sumter, sc
Posts: 270
1990 yj fuel problem

1990 4.2 with webber carb. seems to be running too rich! poor mileage, tried everything I can think of.
fuel cap develops pressure after I dr a mi or so. is this normal?

Politicians are like Diapers, they get full of stuff and need to be changed frequently!
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Unread 03-21-2011, 06:35 PM   #2
Web Wheeler
1983 CJ8 
Join Date: May 2008
Location: N.E. Alabama
Posts: 2,649
I suppose that you have a vacuum building up in the tank. Check out your tank vent tube to the charcoal canister. If the button cap nipple were to be considered the #1 nipple the tank vent tube would the third. It should be a green flexible tube fitted with a rubber tube to that nipple.

Have you tried to dial in the screws to the recommended settings on the carb...and which one is it?
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Unread 03-21-2011, 08:16 PM   #3
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1987 YJ Wrangler 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 6,989
mileage is not going to be great with a 34 weber, i have one and am unimpressed with it. its definitely not a 32/36 or a 38. no power and horrible mileage, i feel.

the pressurization, i would check the tank vent
I don't feel like working on anything, at this time.
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