Engine Circuit Breaker

kordo

Steve D'Antonio is a well regarded marine surveyor.  He mainly works on diesels so I'm not sure if the attached post refers to gasoline engines or not.  Anyone know where the circuit breaker on a Mercruiser engine is?  

aero3113

On a Mercruiser it’s under the flame arrestor cover on top of the engine. And it’s a 50 amp. (I stole the pic from @J3ff)

J3ff

yeah, so now, is that what a working one looks like?? still cant find the answer.. 

J3ff

Alswagg said:

Basically there are two different styles regarding Mercruiser engines. The one with Red button located on most engines, atop the intake manifold, near the starter relay, the current style is a Flag type that is easily tripped and reset able via a push button.   This is also located atop the intake manifold    Both are 50 amp 

If the breaker in the above picture is tripped.. would the motor turn over and start for a couple seconds and die? Or would it just not do anything..

J3ff

That's what I thought, oh well.. I've got a motor that will crank and start but only run for a second or two, with no fuel pump priming noise.. guess it's time to look closer at the fuel pump.  Thank you for the help @Alswagg

J3ff

I didn't really have time to even try to figure out where the fuel pump fuse is. That'll be the first thing I do when getting back to the boat. 

Am I correct in thinking that the noise the motor makes when you turn the key to on (but not start) is the fuel pump priming? 

J3ff

Alswagg said:

Have you ever inspected your distributer cap and rotor?    Also the crank position sensor is the “boss” of all other sensors.  If the crank sensor does not show up to work, non of the others know what to do 

I did look on vessel view mobile, and it didn't show any sensor problems, this was after I cranked it, it ran for 2 second and stalled. I'd assume I would have been getting an alarm or some kind of message. When it did it the first time, there also was no alarm.. really hoping it's this fuel pump fuse