Your problem is a worn flex ring. I have rebuilt hundreds of these pumps. I charge 350.00 to steam clean and tear down the pump. inspect all parts and replace seal kit with flex ring. The drive tube is about 15 bucks if needed, and metering valve about the same. I charge 100.00 bucks to run this pump on a test stand to check fuel output, high and low speeds, and then check hydrualic advance. Then I pressure test the pump for possible leaks. A total of 450.00-475.00 for your pump to run like new, with a one year warranty. I do not cover the pump with cheap looking paint when finished. All pumps are polished and buffed out and look like something you would be proud to install and say you own. Al Baker 231.757.0064
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