2016 Merc 250 proxs(2B122010) dies after idling for several(>10 ) minutes. Starts after fuel bulb is pumped up. Has never lost fuel pressure while running. Fuel bulb sets nearly horizontal(<30 deg.) First shop visit comments: "fuel system staying primed, no alarms , connections tight and clean". Second visit comments: "no alarms, fuel system vacuum at 2.5"HG, checked for air fuel leaks, installed new Yamaha fuel bulb". Do I have a fuel supply system or engine problem? Motor mounted on 2016 Ranger Z520.One additional clue: When bulb is flat, motor doesn't turn over/crank. After 10-17 squeezes, motor turns over and fires up. Have noted in previous posts that a kinked fuel line may cause the problem. Next time idling out of the wood will not trim motor so high. Could be that simple? Also noted in previous posts that re-pumping the bulb may be the best solution since this seems to be a common problem.