2003 VMAX 225 2 stroke motor Shutting Off at High RPM

[lugnut1]

2003 VMAX 225 2 stroke motor Shutting Off at High RPM
Boat shuts off at high RPM then starts back up & runs. Runs approximately 3/4 mile then shuts off again. Help Please.

[Amistad Tackle]

Could be the fuel pump relay.

[OverTimeAgain]

I responded to your other thread as well.


Lift pumps are bad.


Your lift pumps have holes in the diaphragms and they are unable to supply enough fuel to your vst tank.

If your vst tank runs low your high pressure pump will pull air and you will lose fuel rail pressure. Once you lose fuel rail pressure the ECM turns off the motor.


Generally happens above 4500 rpm when fuel demand is higher.


Buy 6 lift pumps off simyamaha, 3 to swap out now and 3 for in 6 months or so. The first sign that your lift pumps are going bad is normally a rough start in the middle of the day.

[wildkat7]

I second the lift pumps. Had the same issue once with my 2004 HPDI.

[skeeterBill200]

I have a 2004 200hp OX66 had the same issue turned out to be fuel pump relay (easy fix)

[lugnut1]

Thanks everyone put 3 lift pump on and she run GOOD thanks

[HaulinBass]

Low pressure lift pumps are notorious for dumping on you. Had a new one fail cause I squeezed the primer bulb too much/hard. Did the LP pump delete. No issue now.