I have a 2004 90 hp mercury 2 stroke on a 17.5 ft nitro boat. It will come out of the hole pretty good, plane out, and act like it's going to run great. After about 90 seconds of being on plane the engine will cut out like it's not getting enough fuel. If I drop the throttle down to about 3000 rpm it will cruise just fine all day long, but when I try to get on it, it will start cutting out again after about 90 seconds.
I took it to a mechanic once already, he told me the engine was "way out of adjustment and the float was set too low on the bottom carb". It worked great for the next fishing trip then it sat in my garage for 3 weeks and all the old problems just came right back again.
I've rebuilt the fuel pump, checked the tank vent, checked the tank screen, checked the ignition coils, replaced the fuel filter, and cleaned all 3 carbs checking the float needles and jets for trash.
I'm at a loss of what to do next. I though about putting a cheap electric fuel pump inline and putting a toggle switch on it to see if that helps. At this point I can't even tell if its a fuel issue or a fire issue. maybe i just need to pull the prop off and attach a new motor to it. can anyone help me out? Also I noticed what looked to be a shut off solenoid, could that be getting weak and causing my problem?
I took it to a mechanic once already, he told me the engine was "way out of adjustment and the float was set too low on the bottom carb". It worked great for the next fishing trip then it sat in my garage for 3 weeks and all the old problems just came right back again.
I've rebuilt the fuel pump, checked the tank vent, checked the tank screen, checked the ignition coils, replaced the fuel filter, and cleaned all 3 carbs checking the float needles and jets for trash.
I'm at a loss of what to do next. I though about putting a cheap electric fuel pump inline and putting a toggle switch on it to see if that helps. At this point I can't even tell if its a fuel issue or a fire issue. maybe i just need to pull the prop off and attach a new motor to it. can anyone help me out? Also I noticed what looked to be a shut off solenoid, could that be getting weak and causing my problem?