Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Marine Quadrajet Flooding Out

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Cliff Ruggles:
Set the float to the factory specs, this makes sure the right amount of fuel is in the bowl.  We don't troubleshoot fuel delivery problems, or flooding problems by raising/lowering the float.  It needs to be at the correct factory setting by carburetor number for Marine applications......Cliff

rozicrc:
I'm giving up on this.  I have been messing with this for 11 months on and off and have snow missed a boating season due to it.  I checked the other carb and swapped it to the same plastic float that it is suppose to run.  I have broken this down and leak tested with air.  I just threw away 25 gallons of gas I thought could be bad and still have the engine dying when the carb floods out.  I can't find a leak on the needle/seat nor can I see fuel pressure bounce over 4.5 psi.  If the needle is not bouncing off the seat without a spike in pressure being readable I don't know what this could be.

Cliff if I send this to you to fix could you run on the test engine to se if you have the same symptoms I do before resorting to a rebuild?  I regret chaning the fuel pump at the same time as the carb rebuild as now I can't rule it out, but I am stumped as to how this could happen with the fuel pressure regulator installed as well.

rozicrc:

Changed the plugs and tried - nothing still died after a few seconds. Changed the coil back to stock and it ran well. Ignitor ii coil went bad with maybe 8 hours on it. I figured it was still flooding out as it would run and die like it did with the bad float/new fuel pump, but it was just what shook into the carb brought the primaries when it would start to run rough and stall. At least I know quadrajet tear downs that o could literally do blindfolded now!

Thanks to all who helped, this was a pain but I am glad we were able to resolve

Cliff Ruggles:
That's good news. 

Just to let you and everyone else know.  If you get stumped on a carb rebuild, (hopefully you used our parts in it), send it to the shop with a note and we'll take it apart and check everything, then run it on our test engine.

I do this a lot for folks who are having running issues and think it's the carb, but are not entirely certain.  We only charge time/materials for this service, and return shipping....Cliff

rozicrc:
Thanks again it was helpful.  On a side note the right setting on the float was 7/32 the rebuild kit speced, not the 3/8 the mercruiser manual specified.  It is up and running.

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