Home › Forum › Ask A Member › 1957 Johnson 10 HP › Re: 1957 Johnson 10 HP
It sounds to me like a carburetor issue. If you squeeze the primer bulb and fill the carb bowl, the motor should run for a couple minutes untill the fuel supply in the bowl is empty, even with a bad fuel pump. It looks like you have a Sierra carb kit there? I have had some of those kits cause me to chase my tail, and cause weird running problems. If it were me, I’d toss that and get a kit from the dealer with a new float, needle and seat, etc.
I’ve been seeing a lot of aftermarket fuel lines deteriorated internally this year, falling apart on the inside causing a restricted fuel flow. Even though the fuel hose and bulb look good on the outside, the inside could be falling apart.