Hi...I have a 2002 Larson 210 with a Volvo Penta 5.0 with 270hp and it is fuel injected...I took it in for servicing in February, 2005...this is after I filled up the tank in November and added Stabil as well...the dealer replaced the fuel sending unit for the gas gauge(which never worked), replaced the fuel filter, changed the impeller and oil...I took the boat out for the first time this year on Sunday, and we left the boat dock idling away in 5mph happy land for about 100 yards, and then when I got it up to 20mph, it started to hesitate and cut out...acting like it had run out of gas...brought it home and added 9 gallons of new gas to it...ran it at home for 20 minutes or 7 Van Halen songs...NO problems, but I didn't rev it up that much for very long...then took it out today, again, same thing...idled for 20 minutes at boat launch, and then when we hit 20mph, it cut out...please, any thoughts, because I am ticked...
I have the same engine and what sounds like the same problem. Seems to work at low rpm but when you put the hammer down it just dies. If it doesn't stall outright the thottle starts to fluctuate. I've gone through cap rotor fuel filter, checking fuel flow which is OK and no codes showing on hte computer. Found a somewhat corroded contact on the fuel pump but not tested since it was cleaned. I am noticing some erratic behaviour on the guages. You might try a coil though. I've had some input as to this might be breaking down.