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Old 08-29-2010, 12:01 PM
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RigglePLC RigglePLC is offline
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Join Date: Jul 2006
Location: Grand Rapids MI
Posts: 9,555
I would replace the diaphragms. Often there is a tiny hidden crack near the center where the bolt goes through. If you can, tilt the pump for 10 minutes to remove the old oil. If not, I usually clean the old oil out with a paper towel. Cpmpressed air is a possibility--but messy--you would have to wash your whole truck, LOL!

Don't install the diaphragms upside down, and be sure they are seated in the grooves for a good seal.
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