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Broke down and ordered 2- Sierra #18-7788 fuel pump diaphragm/gasket kits for the Pro V-150 Yamaha today. Cost. $7.19 ea. plus $5.40 USPS priority mail. Figured $20.00 worth of kits was much better than guessing what may happen on the lake. Now that I have all three carburetors cleaned/adjusted, and re-installed, plus with new kit installed (soon) in the fuel pumps, any future problems has to be spark related.