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    Mercruiser 3.0L mercarb 2 barrel Help!!!

    Hey guys, so I just wanted to update u on my situation. Finally I found out what was going on. So the carb that I ordered turned out to be defected. The mixture screw was not adjusting correctly. You would keep turning it either direction and nothing was changing the engine performance...
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    Mercruiser 3.0L mercarb 2 barrel Help!!!

    M630283 is the serial # of engine
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    Mercruiser 3.0L mercarb 2 barrel Help!!!

    This is the carburetor. And the picture with that adjustment screw, that's the screw that my old carb did not have in that spot. Also a picture of the antisiphon valve
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    Mercruiser 3.0L mercarb 2 barrel Help!!!

    You are right. I thought that right away also. Just sounds like the fuel supply gets cut off somewhere or gets to much fuel meaning to rich. Spark plugs look black so I know its running to rich. Everything was original on this motor before I started to do maintenance on it. So the antisiphon...
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    Mercruiser 3.0L mercarb 2 barrel Help!!!

    Yea it's under the pump.. I will definitely check that out also. I'm at the point were I just want to get rid of this carburetor
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    Mercruiser 3.0L mercarb 2 barrel Help!!!

    I could that test and see if it's functioning probably and the needle is not getting stuck. I'm gonna take the carb off later on today and see what happens. When u mean attaching a clean hose to the inlet do u mean where thr gas line attaches to the carb or somewhere else?
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    Mercruiser 3.0L mercarb 2 barrel Help!!!

    It's part of the pump and you can replace it
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    Mercruiser 3.0L mercarb 2 barrel Help!!!

    I bought the carb at guaranteed carburetors. It was for a Mercrusier 3.0L 135 hp engine. It does have a nipple for the fuel overflow. The fuel pump was replaced and ran fine under the old carb. It's a mechanical fuel pump. The fuel is pumping to the carb but it does sound like it just gets cut...
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    Mercruiser 3.0L mercarb 2 barrel Help!!!

    After it dies its trying to start but it just won't turn over. I can't remember the serial number, I would have to go back and check. I thought I had it adjusted right the second time bc it was running great in neutral. The rpms were good. After sometime under the muffs it starts doing it again...
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    Mercruiser 3.0L mercarb 2 barrel Help!!!

    Yea I bought the carb already rebuilt so it is new. I'm just having trouble adjusting it to the right point. It runs good for a tiny bit and than it dies in neutral. The rpms just drop out of nowhere and than I can't get it started at no matter what I do.
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    Mercruiser 3.0L mercarb 2 barrel Help!!!

    Hey!! I have a mercury Mercruiser 3.0 with a Mercarb 2 barrel carb. I just recently had it rebuild. I was just wondering if there is more than one type of applications for the Mercarb? Meaning that my original one had only one adjustment screw by the throttle arm and the new one has 2. The other...
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