re: Diesel mechanic help with lawnmower sounding like it’s starving for fuel when in a bind.

2653a John Deere it runs like it’s in half throttle and it’s hydrostatic so when I push foward peddle all the way it causes the engine to sound like there isn’t enough fuel to allow it to go that fast. That’s why I thought it could be, hydraulic issue. All 3 wheels have hydraulic motors. Thought maybe this was causing to not have power to run because the hydraulics were messed up.