Rough engine start on a 2000 Ford Triton V10

Do not pump the gas on a fuel injected engine. It does no good. If it will not start on the first try, your fuel line probably lost pressure. It needs 40 plus pounds of pressure to fire the injectors. Here is what you do. Turn key off to run 3-4 times or more to pressurize the fuel line. The reason you have to do it this way is the fuel pump will not stay running if the engine does not start. Safety reasons. DO NOT RUN THE ENGINE IN PLACE. You are doing more harm than good. If it does not start, then you have to check the fuel pressure. If you are handy, I believe there is a valve for checking on the fuel rail on the engine. for that purpose. If there is no pressure in the fuel lines, then most likely your fuel pump is toast. Simple way of replacing fuel pump. Cut a "trap door" in you floor over the gas tank. Makes the job simple. Cover the door with a throw rug. I have found that old gas over a year old will still run the V10. Not so much the Onan generator. ( thanks Onan engineers). On the generator, put a switch on the fuel pump 12 volt line and run the generator dry. Works for me.