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If the starter is turning the engine over but it is not starting, try the fuel pump test jumper:
http://www.4crawler.com/4x4/CheapTricks/index.shtml#FuelPump

Forces the fuel pump on.

I placed a jumper in the test connector when it first began to give me a problem. The fuel filter has also been replaced. I seem to be getting fuel to the engine. Once the engine runs it will start with no problem. But after 3 or 4 hours same problem.