Hey everyone,
I've got a mid-1970's (I think 1975, but can't remember for sure) 25 HP Johnson Outboard on my little fishing boat that is acting up.
It usually starts pretty reliably, but sometimes it is difficult to start. When it IS difficult to start, it runs very inconsistently and cuts out at idle. It seems to idle regularly for a second, then cut out and rev down, then back up to regular idle, repeating. Usually it will die or do the same cycle at higher RPMs if you try to throttle it up.
I've tried both running it normally and pulling the choke lever out-doesn't seem to make a difference. Here is the part that has me confused: when it does this, if you try to squeeze the fuel line bulb to help prime it-it is full of air. You can squeeze the darn bulb all you want-it will not fill with fuel and just continues to feel like air in there (I've had an outboard for several years, I know how to feel the difference between air and fuel in the priming bulb).
I've changed out the fuel cap on the tank, the entire tank, and the fuel line and I'm still having this problem. Anyone got any ideas? What confuses me most is that it doesn't do it all the time. I can't recall if it does it when it is both hot and cold-but I think it does it either way.
Any insight would be greatly appreciated.
Thanks.
I've got a mid-1970's (I think 1975, but can't remember for sure) 25 HP Johnson Outboard on my little fishing boat that is acting up.
It usually starts pretty reliably, but sometimes it is difficult to start. When it IS difficult to start, it runs very inconsistently and cuts out at idle. It seems to idle regularly for a second, then cut out and rev down, then back up to regular idle, repeating. Usually it will die or do the same cycle at higher RPMs if you try to throttle it up.
I've tried both running it normally and pulling the choke lever out-doesn't seem to make a difference. Here is the part that has me confused: when it does this, if you try to squeeze the fuel line bulb to help prime it-it is full of air. You can squeeze the darn bulb all you want-it will not fill with fuel and just continues to feel like air in there (I've had an outboard for several years, I know how to feel the difference between air and fuel in the priming bulb).
I've changed out the fuel cap on the tank, the entire tank, and the fuel line and I'm still having this problem. Anyone got any ideas? What confuses me most is that it doesn't do it all the time. I can't recall if it does it when it is both hot and cold-but I think it does it either way.
Any insight would be greatly appreciated.
Thanks.
