I had almost the same issues with my 2006 40HP 4 stroke. Did the same thing changed out everything in the fuel system with no luck. I watched at least 6 YouTube videos of the VST teardown all were about the same but one? It told of a screen filter under the fuel pressure regulator that no one...
The primer bulb is not collapsing and I made sure the vent was open on the gas tank. I do not believe it is vapor locking? It does act like a fuel problem but just can not figure out what it is?
I bought a pontoon with a 2006 40HP 4 stroke that had not been ran in a few years. It runs fine for about 15 minutes then it acts like it runs out of gas? It will restart but runs on and off from that point on. I have replaced both the fuel pumps (Low and high pressure) with pressure regulator...
I have a 2006 40HP 4 stroke motor, replaced the water pump but when it is in the water it looks like the pee water is coming out the center of the back of the engine? Is the correct?