A friend has asked for my help in getting his Mercury outboard started. It has been sitting in storage for two years, but ran fine before that. Still has the old fuel sitting in it too - wasn't properly prepared for storage in the garage. The Merc's an older model number 1035504, thirty five horse unit. He tried to start it last year, but no luck. Any hints for cleaning out the fuel system/carb? I would guess that the old fuel has it at least partially clogged. Also, the unit has an "auto-blend" oiler, that I assume, like many older two strokes, blends the injector oil and the fuel to avoid the need to premix at the fuel tank. I've heard that its best to disable these types of fuel mixers in other types of two stroke engines and just premix the fuel at the gas tank. Is this true here? Supposedly these oil injectors fail all the time and leave people with damaged engines. What do you think? Greatly appreciate all of the help!
<br /><br />First step is a Repair Manual.<br /><br />Clean carbs and fuel pump. Overhaul if needed.<br />Replace water pump impeller.<br /><br />Then go to the Engine FAQ section and do any required troubleshooting in the "Outboard wont start" topic.<br /><br />Good luck, and let us know what you find. 