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    Carburetor Issues, Dripping Carbs...

    Yep it is Sierra. Must have got bounced in shipping, but I think the float is a high density foam. I think. It doesn’t seem hollow, but that foam means that the metal can easily carve into it. I’m hoping that is what it was, seems most likely and fixed when I replaced it with the old tks carb...
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    Carburetor Issues, Dripping Carbs...

    Just thought I would share a picture. I was seeing that the metal was able to wiggle a little in the float, and I am presuming that maybe this was getting dislodged. Pictures attached incase it helps anyone else.
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    Carburetor Issues, Dripping Carbs...

    Ok solved… I was found that the float had been installed and that there some side sway in it. This must have been causing intermittent sticking. I replaced it with a spare float, and problem solved. No longer flooding and dripping. Thanks for helping out.
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    Carburetor Issues, Dripping Carbs...

    Yep it was working fine, and I had adjusted the mixture against manifold vacuum, and it was running really nicely. Maybe the float or needle changed, but the timing etc was fine when running, but maybe once running again I need to get into base timing. Going to do some diagnostic now on pump...
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    Carburetor Issues, Dripping Carbs...

    Float is hollow. No fuel in it. Going to test fuel pressure in the morning to see where it is. Then will go to carb if it isn’t the pump.
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    Carburetor Issues, Dripping Carbs...

    appreciate all the help guys on this one so far.
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    Carburetor Issues, Dripping Carbs...

    it is a 2 barrel, sierra, this one - https://www.summitracing.com/parts/RRA-18-7376N just looked closely at engine and found it is an electrical pump. had assumed it was mechanical, so sorry for miss-information. Now that I know I should be able to easily test the pressure.
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    Carburetor Issues, Dripping Carbs...

    Haven't been able to get fuel pressure yet. Trying to figure out how from the above comments as engine isn't currently running. Sound like I would have to take all plugs out...
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    Carburetor Issues, Dripping Carbs...

    Yep it is just strange that it just starting happening, and I hate throwing parts at a problem instead of being able to diagnose. @Bt Doctur did you see it coming out of the Venturi? Will see if I can measure pressure, or is it possible to take the pump out of the equation and gravity feed?
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    Carburetor Issues, Dripping Carbs...

    The fuel is leaking from the Venturi as well as overflowing sometimes. Looking at cleaning the needle and seat. But just wondering if this Could this be caused by fuel pump pressure being to high? It is a mechanical pump and the carb is a Sierra replacement that I fitted and worked for a few...
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    Carburetor Issues, Dripping Carbs...

    Ok. I’m going to try changing pump first then, if that doesn’t work back to carb
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    Carburetor Issues, Dripping Carbs...

    So resetting the float height would probably not achieve much. I'm not sure how I can measure current fuel pump pressure as I currently cant get the engine to start for more than a second?
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    Carburetor Issues, Dripping Carbs...

    Thanks. Ok that makes sense, so if pressure is too high, fuel would get through. I checked by blowing air through and the float cut the air supply of when it was in the up position, so would this mean it isn't a needle issue?
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    Carburetor Issues, Dripping Carbs...

    I recently installed a new carb on a 5.7l mercruiser. The carb and engine were running fine, and then I had difficulty starting after a few weeks. I looked down the carb and noticed it was dripping and flooding the engine. I just took the carb apart, cleaned it as I thought maybe the float was...
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    Inconsistent Idle RPM

    Thanks will try that. I had done it, but probably readjusted and didnt swivel it again. Will see what happens.
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    Inconsistent Idle RPM

    I've got a mercruiser 5.7 carbureted engine. I replaced the carb and am getting a steady idle of 700, good vacuum 20hg, and tested for vacuum leaks, and found none. My problem is that sometimes when I have throttled up and then come down, I get a lower or higher idle rpm. The only thing I...
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    Fuel Pump Switch / Oil Pressure Sender issue with Fuel Pump

    Hi, I am having issues at start. Engine will turn on for 30 seconds then die. I followed the advice on the forum and I bypassed the fuel pump switch and it will run fine. I can hear the fuel pump start when ignition is turned on when I bypass the fuel pump switch, as it used to. I thought then...
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    Help Identifying Parts for Replacement (Oil and Fuel Switch)

    Thanks for your help. I will give it a go. Missed that cross reference on MercruiserParts! Thanks.
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    Help Identifying Parts for Replacement (Oil and Fuel Switch)

    Thanks For your help: the oil sender oem is pretty expensive. Is there any reason I couldn’t replace with a standard Sierra oil sender like this one? Sierra 18-5899 Oil Pressure Sender, Medium https://www.amazon.com/dp/B000FQ79JO/ref=cm_sw_r_cp_api_glt_i_QFH7KX75H4F5HQRT2N7Z?_encoding=UTF8&psc=1 ?
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    Help Identifying Parts for Replacement (Oil and Fuel Switch)

    Yep serial is 0w332827. Thanks for your help. 0W332827 = https://www.mercruiserparts.com/5-0l-carb-alpha-bravo-0w310000-thru-0w
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