Hi, Mike's Carburetor Parts.
In this video I'm going to talk about flooding on a Motorcraft 2 barrel 2150 carburetor.
So why is my carburetor flooding?
1st lets talk about what is flooding?
Carburetor flooding is a condition that occurs when too much fuel is delivered into the carburetor, causing an overflow. This can happen for several reasons:
What can cause flooding?
Improper Fuel Pressure:
If the fuel pressure is too high, it can overpower the float mechanism, causing more fuel to enter the carburetor than it can handle. For this carburetor test for 4.5-5 lbs. Don't trust a new fuel pump. Add a regulator between the pump and carburetor if needed.
Dirty or Malfunctioning Needle Valve:
The needle valve controls the flow of fuel into the bowl of the carburetor. If it's dirty or not seating properly, it can allow too much fuel to enter. Check the viton tip of the needle to see if has swelled up, or is scratched. Remember not to put pressure on the needle when adjusting the float.
Test the needle by holding down the needle in the seat and blowing through the fuel inlet. You should not be able to blow through at least with 4.5 lbs of air.
Excessive priming:
Pumping the gas pedal too many times can flood the carburetor. When cold press down on the accelerator once, then crank the engine. If you suspect you pumped the gas too much, hold the pedal all the way to the floor and crank the engine.
Bad Float:
Check the float: A brass float can be tested by heating up a pan of water just prior to boiling and imerse the float. Any bubble? replace the float.
A Nitrophyl float must be weighed to see if it has absorbed too much fuel. The Nitrophyl float is a very dense honey combed material that can absorb fuel over time. Weigh the float with a gram scale like this one.
Is the float rubbing anywhere?
Is the float catching on perhaps the float pin?
Check the float level. Measure from the top of the float to the edge of the float bowl. Check you spec sheet for the exact measurement as they can be different for different models.
Check for a leaky venturi. After running look down the carburetor to see if gas is dripping from the venturi. If so then the gas is being siphoned from the float bowl into the intake. The inlet check ball might not be seating. Tap it lightly to form a good seal. There may be a spring missing from above the check ball. The gas cap may not be vented when it should be. The bowl vent might be blocked off.
OK, so that covers the primary reasons for a carburetor to flood.
I hope this helps you troubleshoot your 2150 carburetor.
Please visit us at mikescarb.com
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