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...
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.
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.
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...
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.
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...
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?
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...
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?
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?
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...
