high pressure fuel pump

[Mako1988]

I have had my screens cleaned on the high pressure fuel pump, replace my gas tank, changed all filters and I still have some issues when I give it full throttle. It runs ok at slower rpm's, I just have to accelerate slowly to get on a plane. Any ideas?

[greasyshaft]

What Model?

[99yam40]

monitoring the fuel pressures will give you an idea what is going on.

If pressures stay in spec while RPM problems occur, then you may need to have the injectors flow tested and cleaned

[Dave Blaber]

What motor?, I had the same issues with my Yamaha HPDI 200 two stroke, I found replacing the electronic fuel pump solved the problem on the one motor and replacing the small bearing in the high pressure fuel pump solved the other motor RPM problem.