Mercruiser 3..0lx Carb Question

[MikeDobbs]

Hi everyone- I've just purchased my first power boat, powered by the Mercruiser 3.0lx motor. The motor turns over, but does not fire up currently. I am working on diagnosing the issue and have a question about the operation of the throttle.

When the engine is off (before it is started) should advancing the throttle "pump" gas into the carb? In other words, if I look into the carb with the spark arrestor off, should I see gas being shot in when advancing the throttle?

I ask because when I advance the throttle multiple times, I see no gas entering the carb, and I am trying to determine if this is an issue.

Thanks for your help

 

[achris]

Do you have an engine serial number, or at least a year of manufacture? If you're unsure of where to find the serial number -> http://forums.iboats.com/forum/engi...d-engine-serial-numbers?p=6661412#post6661412

 

[MikeDobbs]

Sure thing.

Engine serial #: 0K277779

Mechanical fuel pump (not electric) in case that's why you are asking...

 

[Bondo]

In other words, if I look into the carb with the spark arrestor off, should I see gas being shot in when advancing the throttle?

Ayuh,..... Welcome Aboard,.... Yes, that's correct,....

 

[johnnypac]

Yes, you should see 2 streams of gas..... Assuming it's a 2bbl, more likely a mercarb or Rochester. How long has it been sitting?
Without much info given, I'd say start with the basics, check for spark, then if you have spark and no gas, check the fuel pump to ensure it is pumping fuel to the carb.... If so, may need a rebuild for the carb, inexpensive and easy. If it's been sitting a while, my guess would be carb. Mine sat for a yr and a half and it had tons of junk in the carb, rebuilt it and now it purrs like a kitten.
New gas in the tank