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Old 11-07-2012, 03:26 PM   #1 (permalink)
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Default Power Valve ?

I have a Autolite 4 bbl. carb. C5ZF-C. OE on my A code 289 motor. Started having re-start problems and determined the cause was a flooded condition caused by a leaking power valve. Got a generic valve from NAPA part # 2-4005 installed it and this one leaked as well. When I remove the power valve housing lower cap it is full of fuel. Just bad luck or is something else going on ? Thanks in advance. Brian
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Old 11-07-2012, 03:56 PM   #2 (permalink)
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welcome aboard VMF.

you can use any Holley or Barry Grant power valve for the autolite carbs.

imo better quality then the otc stuff.
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Old 11-07-2012, 03:59 PM   #3 (permalink)
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Let me ask the obvious; a gasket was used on the PV before screwing it into the base of the carb - yes? Other than the possibility of the new valve being faulty, I know of no other reason you would have fuel in the cap.
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Old 11-25-2012, 02:33 PM   #4 (permalink)
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Got a Holley 6.5 power valve and installed it. Thanks for the tip. Seem to have developed another problem. The secondaries won't open. With the motor running and at about 1/2 throttle the secondary arm will not move forward and I cannot move it manually. With the motor off and at about 1/2 throttle I can move the secondary arm forward and the plates open as well. Thanks, Brian
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Old 11-25-2012, 02:50 PM   #5 (permalink)
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Sounds like you have have a split diaphragm there too. IIRC, there is also a locking pin and lever connected to the choke mechanism that prevents the secondaries from opening unless the choke is fully open.
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Old 11-25-2012, 05:43 PM   #6 (permalink)
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Thanks for the reply. The secondary plastic arm, rod and pivot @ the fast idle adj. are all in place. This is the assembly that won't move when the motor is running and can be moved when not running. Secondary diaphram ? Brian
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Old 11-25-2012, 07:32 PM   #7 (permalink)
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