Hello! I have an 06 Mercury 90HP 4 Stroke EFI that will start fine initially and then stall within thirty seconds. Each restart finds that the run time decreases until it will no longer start at all. "Key On" with the engine cover off finds that the lift pump in the FSM unit will fill the FSM until full quickly, with no problem. Bench test of both the lift pump and high pressure pump finds they both operate properly. Fuel pressure is well within the good range both at key on and while running. Entire FSM was replaced abut 4 years ago. Runs like a lack fuel supply issue. Plenty of spark. Any ideas?
