evinruderunner
New member
I just got a 2011 F70LA Yamaha that runs fine until it gets to 6 to 7 mins. Then shuts off.
Pressure at the fuel rail is 33 psi until it slowly starts to bounce and then drops to 0 psi.
The first owner has replaced the High and low pressure fuel pumps and the fuel filter above the low pressure pump.
The fuel assy on the motor has been cleaned, the fuel tank has been cleaned and new fuel is being used.
The pressure Regulator has been replaced.
The VST has been removed and cleaned, the float and needle valve have been replaced.
I have good steady spark all the way to shut off.
I have run the motor with the fuel cap off the tank and I have run the motor on a little 6 Gal tank, motor still stops around 6 mins.
I have the service Manual and have been reading everything I can find about the VST system and how the motor works.
I have tested the motor with the Yamaha YDS and can find nothing wrong.
Any help, Ideas, or just thoughts will be greatly appreciated.
Pressure at the fuel rail is 33 psi until it slowly starts to bounce and then drops to 0 psi.
The first owner has replaced the High and low pressure fuel pumps and the fuel filter above the low pressure pump.
The fuel assy on the motor has been cleaned, the fuel tank has been cleaned and new fuel is being used.
The pressure Regulator has been replaced.
The VST has been removed and cleaned, the float and needle valve have been replaced.
I have good steady spark all the way to shut off.
I have run the motor with the fuel cap off the tank and I have run the motor on a little 6 Gal tank, motor still stops around 6 mins.
I have the service Manual and have been reading everything I can find about the VST system and how the motor works.
I have tested the motor with the Yamaha YDS and can find nothing wrong.
Any help, Ideas, or just thoughts will be greatly appreciated.