What happen is that my engine will run for about 20min or so like their is nothing wrong with it, then the engine stalls and will knot restart until the engine has cooled all the way down. Then it will restart like nothing was wrong, what it i found out is that were the fuel pressure check valve is have nothing but air in it that's when the engine stall, when it cool down the check valve has fuel in it and fuel press also engine will start to run. What do you guys think is causing this problem?
A model number will tell us exactly which engine you have.
If you suspect a fuel delivery problem, a test run with a fuel pressure gauge, a clear piece of fuel line tee'd into a vacuum gauge and a seatrial, will show you where the fuel issue originates. The procedures are outlined in the service manual and taught in the factory training centers for dealer technicians.
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.