What could it be?
Just posting this in case anyone else has suffered similar symptoms and found the cure!
I have an intermittent fuel problem that seems unsolvable without cutting up the decks and removing the fuel tank (which we'd rather not do). The RIB is an 8m Cobra with a Yamaha 350hp 4-stroke.
Problem is that sometimes when cruising at mid range/high revs, the engine cuts down on revs and sometimes dies. Other times as the speed decreases, the engine comes back to life again. This seems to happen more in rougher seas., On occasions where the engine cuts completely, we have noticed that the primer bulb has been sucked flat suggesting a fuel blockage between the tank and the primer bulb. Engineer has checked fuel lines and replaced primer bulb, sea-trialed it for 40-mins and it didn't miss a beat. Next trip out - same problem!
My thinking is there could be something in the tank that is periodically blocking the outlet and then unblocking as the speed decreases and fuel moves around in the tank?
Could it be anything else that I haven't thought of?
Any advice welcome
You get what you settle for!