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Davern1
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Yes, it was new OEM pump. Fuel pump was also found to be bad after putting the cooling system back together. I wonder if the fuel pump started failing on the grade, the engine leaned out which quickly raised the pressure and then it blew the expansion tank and seal on the water pump?
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My expansion tank just blew up last weekend while I was pulling my Airstream up a long, hot grade in the Eastern Sierras. I had had the water pump changed two weeks prior due to a leak. I pulled over within a mile and the car overheated. Had it towed to a local mechanic in the area who replaced the expansion tank and now has found a leak in the water pump that was just replaced. He thinks the new water pump was defective and probably leaking which built up too much pressure and blew the tank. It was completely in two pieces. Any thoughts?