Question about 1983 Jeep CJ5

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Troubleshooting fuel system for 1975 jeep cj5

Why is my 1975 jeep cj5 fuel running very rich even though I replaced the carburetor, fuel pump, wires, spark plugs, cap and rotor? someone told me that aftermarket fuel pumps are defective is that true?

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I have a 1974 CJ5 with a 258 I have replaced the carb,pump,plugs,wires,cap,button,coil filter and the jeep will idle fine but when you try to drive it or give it alot of fuel the jeep back fires and its like someone turned the fuel off. what could the problem be.

Posted on Apr 24, 2010


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Very-rich run sounds beyond an adjustment.

Carter YF carb? (1bbl) You don't say which engine/carb, so I am guessing I-6 with a 1bbl. It was most common engine in the mid-70's.

Most commonly a slobbering-rich running YF (we are thinking so slobbering rich it barely idles at all-black exhaust, but will run with throttle open, still rich) is usually a stuck float. The second most common will be a result of a hole in the accelerator pump diaphragm. In either case removing the air cleaner, and looking into carb while engine is running you will see fuel rapidly dripping from venturi. (ok, just in case you forgot, wear safety glasses for that part, don't get too close, a backfire is going to cause a face-flaming !) Some of the cheapo carb kits are not all that compatible with ethanol, and the diaphram will get soft and start to break down in very short order.

If the carb is not assembeled correctly, and the power-valve needle isn't installed correctly it will cause a rich off-idle condition.

Provided the engine is not missfiring, the problem has to be carb related. The only time I can think of ever seeing a fuel pump cause a rich condition it was a result of a performance fuel pump designed to produce 20+ psi overcoming the float valve.

Posted on May 19, 2009

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Fuel pumps just supply fuel to the carb. Either they work or don't work. I would make sure that the mixture screws on the carb are set properly. Turn the screws in to lean out the mixture, do one at a time.
You want to turn the screws in to the point where the jeep will start to idle rough and then back out a 1/2 turn. Check your timing also. If the jeep has alot of miles on it, the timing chain will stretch and it's possible that you cannot get the correct timing.

Posted on Dec 30, 2008

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