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I have a 2000 Larson inboard w/merc engine. Quit working, put…

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I have a 2000 Larson...
I have a 2000 Larson inboard w/merc engine. Quit working, put in a fuel pump. cleaned out all fuel filters but seems like the engine does not get gas and backfires when tryng to start it. replaced spark plugs also. engine turns over but seemd like not getting enough gas. what can I look for?... Read full answer
I have a 2000 Larson inboard w/merc engine. Quit working, put in a fuel pump. cleaned out all fuel filters but seems like the engine does not get gas and backfires when tryng to start it. replaced spark plugs also. engine turns over but seemd like not getting enough gas. what can I look for?
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Answered in 20 minutes by:
9/8/2013
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,504
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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Hello. My name is XXXXX XXXXX I will be assisting you today.

 

Has the engine been sitting for awhile?

Could I get the engine serial number please?

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Customer reply replied 5 years ago


3.0 mercrusier ol622468 boat sat for two weeks before I received the new fuel pump has sat for two weeks while I am try10ing to get it going

Remove the flame arrestor and have a friend pump the throttle do you see fuel squirting down the throat of the carb?
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Customer reply replied 5 years ago

I took off the fuel into the carburetor and saw gas come out when the throttle was pumped.

What made you replace the fuel pump?

Did you have this issue before you replaced the fuel pump?

Have you checked the fuel filter in the carburetor?

So the engine hasn't run in a month correct or longer?

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Customer reply replied 5 years ago


motor quit would not start. So I felt the motor wasn't getting gas so I replaced the pump. I checked the filter where the gas goes into the carburetor, looks clean. It has been about a month since it was working

So if you pump the throttle 3 times will the engine start and run for any period of time at all? The engine should start if you see fuel squirting into the carb. Do you have spark on all cylinders?
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Customer reply replied 5 years ago


I will check and see if gas goes into the carb. When I pump 3 times the motor barely goes and then backfires. I have to continue to pump just to get the motor to turn over. I put a little gas into the carb and it starts up great, then dies. I did not check the gap on the plugs when I put the new ones in. Can there be blockage where the fuel filter goes into the carb(on the other side of the filter)

I believe you have a clogged carburetor. The filter is supposed to stop any debris. Being able to pour fuel into the carb tells us the engine is fine with spark. The fuel pump is new so you have fuel pressure. The only other possibility is the boat side fuel system is restricted not allowing enough fuel to the engine. Run the engine on another fuel source if this doesn't help then the carburetor is the issue. Remove carb disassemble, clean and install carb kit.

 

Post back with questions, findings and concerns before rating please.

Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,504
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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