I had lots of issues with pumps when I first built my buggy. I went through about 5 stock pumps and a KRC before I finally found the issue. I kept blowing out seals and even sheared off a pump shaft in one of the stock pumps. Ended up finding that the ram was eating itself up internally and sending small metal particulate through the system. I had a screen filter inline but the metal was small enough to pass through it. It appeared the metal was blocking the internal pressure release valve and causing the pumps to overpressurize and fail. Once I replaced the ram and thoroughly cleaned the system out I no longer had any issues.
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Ian
06 Toyota 4Runner
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