Question about Jeep CJ5

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151 4 cyl , runs for 20 min perfect then starts bucking and seems like its starving for fuel and wants to stall. let it sit for half hour and its fine, starts right up. i suspect carb. malfunction have a 1980 cj5

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  • brutus246 Jul 25, 2008

    changed fuel pump same result

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Could be carb but you should also look and make sure the fuel supply line is not running near the exhaust manifold or anywhere it could experience high temps as it may be boiling the gas in the line and could be "vapor locking" the fuel line. After it cools, the vapor dissipates and the unit has plenty of liquid gas then. Also check the manual fuel pump if it has one and make sure it is not faulting. The diaphragm could be getting weak and the engine heat could be causing it ti get soft and lose it's ability to draw fuel. Good Luck!

Posted on Jul 15, 2008

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