F70LA 2011 Running out of fuel

[coueytwo]

F70LA Yamaha running out of fuel after 8 minutes at idle or 4 minutes at 2000 RPMs. Have Replaced the low pressure fuel pump, same results. Replaced high pressure fuel pump with the new LP fuel pump still installed same results. while VST was off cleaned and checked out theVST. Reinstalled VST, Removed the fuel vent line, ran the motor and we had the same results. When the engine starts to fall off if I pump the fuel bulb the engine picks up and runs fine for the next 8 minute cycle. Not sure if this is a known problem or just something on this motor. Would like to hear your Ideas

[ausnoelm]

Try running it off a seperate complete tank, hose and primer with fresh fuel.

[99yam40]

Try running it off a seperate complete tank, hose and primer with fresh fuel.

and monitor the LP pump to see it is running when it should if you do not find an air leak or restriction from the tank