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Pump works fine. I used air to blow out the lower filter and the fuel line leading back to the fuel tank. The ZD21 runs like new again. I can't imagine what is in the tank pluging the fuel line. :)

I have a ZD21. It has not given me that first bit of trouble until three days ago. It will not start. I changed the filters, pumped fuel all the way through the filters and line to the injectors then started it up. I ran it for two hours then it quit. Any suggestions?