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Old 04-28-2019, 07:22 PM   #1
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Default Carb Problem

Just put a re-built carb on my 2006 5.0, and I can't get the engine started.
The inside of the carb is wet with fuel. However, I don't see any fuel squirt out of the discharge holes when cycling the throttle repeatedly from full throttle to quarter throttle. Is this an indication that the accelerator pump is bad?
I also checked that the choke was closed before starting, and, that the idle mixture screw was out 1.5 turns.
I went back and forth on whether to shoot some starting fluid down the carb, but decided not to after seeing no fuel squirt on the throttle check.
Any recommendations and questions welcome.
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Old 04-28-2019, 10:18 PM   #2
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Yes it seems the accelerator pump is not working.you can try some starting fluid or a small amount of gas down the carb throat, just not too much.
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Old 04-28-2019, 11:58 PM   #3
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Thanks for the reply Mike. I'll use some starting fluid on it and try to get it running before deciding if the accelerator pump is not working.
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Old 04-29-2019, 01:13 AM   #4
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Remind me, this is a 2bbl; correct?
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Old 04-29-2019, 01:27 AM   #5
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Yes, two barrel
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Old 04-29-2019, 11:49 AM   #6
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Get Mercruiser manual # 24 from Documents of this site and go to section 5B which covers your carb and includes troubleshooting.
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Old 04-29-2019, 10:04 PM   #7
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Thanks Mike, always a good idea to read the service manual.
I've been using service manual #24 through this process. In section 5B there is an 8 point carburetor checklist, and my rebuilt carb passes 7 of the 8 checks. Fails the "does it spray fuel from the venturi discharge nozzles when the throttle lever is pumped?" test. I was hoping there was someone on the forum with some experience with this problem. I'm trying to determine if there is a problem with the carb and I need to return it.
I'm going to the boat on Wednesday and pour some gas in the carb to get it started, hopefully. Buying a rebuilt carb is always an adventure.
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Old 04-29-2019, 11:45 PM   #8
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Quote:
Originally Posted by jrsick View Post
Thanks Mike, always a good idea to read the service manual.
I've been using service manual #24 through this process. In section 5B there is an 8 point carburetor checklist, and my rebuilt carb passes 7 of the 8 checks. Fails the "does it spray fuel from the venturi discharge nozzles when the throttle lever is pumped?" test. I was hoping there was someone on the forum with some experience with this problem. I'm trying to determine if there is a problem with the carb and I need to return it.
I'm going to the boat on Wednesday and pour some gas in the carb to get it started, hopefully. Buying a rebuilt carb is always an adventure.
This is definitely a carb issue. Either the accelerator pump is not being compressed, linkage issue or a passage is blocked. Thought you rebuilt it, did not realize it was a remanfactured one.
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Old 04-30-2019, 04:44 AM   #9
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I would say return it as you paid for a working carb.
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Old 04-30-2019, 09:13 PM   #10
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Thanks Don and Mike. I'm going to the boat tomorrow with a bottle of gas to try and get it started. If no start, I'll remove the carb and take it back. I'll let you know what happens.
If you don't hear back from me, that means I used too much gas......
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