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Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 10194
Experience:  Degree in Marine Technology. Gas and diesel marine mechanic.
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15 hp honda outboard engine not getting fuel. changed fuel

Resolved Question:

15 hp honda outboard engine not getting fuel. changed fuel filter but that did not help.
could it be the gas tank? (I have the vent properly opened)
Submitted: 3 years ago.
Category: Boat
Expert:  Jason replied 3 years ago.

My name is XXXXX XXXXX I will be helping you today. Most questions will involve troubleshooting, and usually take many posts back and forth.

 

Does the engine only run if you squeeze the primer bulb?

Customer: replied 3 years ago.
engine runs when choke is on not by priming the bulb
when it stalls, the fuel filter is 1/2 full of gas
Expert:  Jason replied 3 years ago.

Now does the engine only run with the choke on? Or will it run with the choke off?

 

Does pumping the primer bulb as it runs keep it from stalling out?

Customer: replied 3 years ago.
Last night it would run only with the choke on. This morning I am
unable to start the engine at all-does not even fire (the engine quit running
last night as my wife left to go fishing and stopped within 75')
I just checked one of the spark plugs-it was dry. I did not need to prime
the bulb as it was already completely tight.
Expert:  Jason replied 3 years ago.

Then what your looking at is a clogged up carb.

 

The engine needs a specific ratio of fuel to air in order to run. When the carbs clog, it does not flow enough fuel (if its real clogged, it does not flow any fuel at all).

When you activate the choke, what your doing is restricting the amount of air the engine has going to it. If you restrict the air and it runs, then even though the engine does not make any power (becaue of lack of air) it runs, and it runs because the fuel to air ratio is correct when chocked.

 

A full and proper carb rebuilt will take care of the issue for you.

 

Post back with questions

Good luck!

Jason

Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 10194
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Jason and 3 other Boat Specialists are ready to help you
Customer: replied 3 years ago.
What is involved in cleaning the carb-is this something an average
home mechanic can do?
Expert:  Jason replied 3 years ago.


When we clean them in the shop. We take the carbs off the engine and bring them to a workbench where we fully dissasemble them. Then we clean out every little hole and passage with spray carb cleaner followed by high pressure compressed shop air. When we are done we put them back together with new carb kits and reinstall them.

 

Now if they are very dirty. Then we send them off to a carb shop with an ultra sonic carb cleaning machine. The ultrasonic is like a big jewelry cleaner just for carbs. It works the same way a Dr would use an ultrasonic machine to bust up a kidney stone. It cleans out the passages that you just cant get to.

 

Now the Honda carbs are a bit tricker than your average carb because they are so intricate. If you have never cleaned, say a lawnmower carb, then it might be a bit difficult for you.

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Jason
Jason
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Degree in Marine Technology. Gas and diesel marine mechanic.