I have a 16hp briggs twin that will run fine for about 15 minutes then it looses fuel flow and shuts down. I have replaced the fuel filter, fuel line, and installed new carberator diaphrams. With a clear fuel line I can see the loss of fuel in the line as the engine looses power. Once the engine cools it will run fine again. Where should I look to solve this issue?

Hi,
Start with the fuel cap.
Peace,
Clarke