Why carburetor flood

Once you apply the cleaner, use a wire brush to clean the excess oil that has gummed around the carburetor.

A normal fuel pressure is 6. High fuel pressure--usually due to a fuel pump that's defective or worn--can cause carburetor flooding. Check the fuel pump, or if you lack the expertise to do it yourself, seek a professional opinion. According to the pmocarb. To solve the problem, shorten the tang, then readjust the float drop. You will occasionally need to replace the floats on the carburetor. After making such a replacement, compare the old floats to the new ones.

This should cause the choke plate to close. When the engine starts, the choke should open partially and continue to open as the engine warms up. When the engine is warm, full operating temperature the choke should be fully open. And for the non-automatic choke cars, make sure the manual choke is hooked up properly. Push the choke knob in as the engine warms up.

You can smell gas-remember if the gas is boiling you are smelling the gas vapor not the liquid fuel. Check engine vacuum using a vacuum gauge.

Gauge should read approximately 18 inches at idle. If vacuum is low, check condition and location of all vacuum hoses. Check carburetor base gasket and manifold gasket. Run an engine compression test. Worn engine parts such as valves, rings, or camshaft will cause a rough idle. Look at the ignition system plugs, wires, cap and rotor.

Remember: You must flush the fuel pump as dirt or rust in the carburetor will cause a rough idle. To check the carburetor for air leaks you can spray it with carburetor cleaner and if the engine rough idle smooths out you have an air leak. Now do not do this with a super hot engine, and if you have a painted carburetor kiss the paint good-bye.

Also, check the ignition system and the timing. Make sure that the distributor advance mechanism is functioning properly. Other problem areas include cracked or improperly connected vacuum lines or a clogged exhaust system. Check for miss-adjusted fast idle cam screw, or idle screw. Check for proper operation and adjustment of all linkage on the carburetor. Check choke operation and make sure the base gasket is properly installed. It is nearly impossible for a carburetor to cause a vehicle to backfire.

However, too lean a mixture setting can cause backfiring when you first start a car. Make sure that the spark plug wires are properly attached and that the distributor cap is free of any carbon tracking.

Check the ignition rotor to make sure that it is in good condition. Set the ignition timing to specifications. Check the manifold vacuum with a vacuum gauge. A bad vacuum leak can lean out the mixture enough to cause an engine backfire. Now no flooding. It must have something to do with the gravity pull of the fuel giving too much pressure which lets the gas continue into the carb overflowing through the small vent holes in the top of the carb. I read this in a post somewhere.

They said if the tank is more than 2ft above the carb it will force feed the carb. My tank is only 6 inches above the carb. This is the way it was set up from the factory on this MTD Yardman Tractor when it was built in The engine runs now. I drove the tractor around my property and it never flooded.

I still need to fix this problem. I know it is not the carb because I replaced the upper half of the carb with a new one. I had the same problem with the new "Seat" and new "needle valve". Without the model and type numbers from the engine itself there is no way for us to determine what carb is being discussed. Given the info you have posted leads me to suspect that the float is operating at a high level than specified and thus is never actually seating the needle valve.

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Remove the float, stick it in a can of gasoline, and let it set until next day. You might find that the 'float doesn't! The float can develop a leak all by itself, and will drive ya to the poor house from buying everything except a new float!

Ok Rusty, sounds good. I will take the float out of the carb and stick it in a can of gasoline. Should I put a weight on the float so it is totally submerged into the gasoline? Let me know. I will do it. What ever you say. Sure, you can weight the float. Here's the thing with the inlet valve. The wire that retains the valve to the float can sometimes bind on the tower that the float attaches to. So, position the wire so that it is furthest away from the tower. Know that the vent holes are open as well.

Also flush the fuel line. When disassembling, you'll often break loose "chunks of crud" that were attached to the inside of the fuel line. If it's deteriorated at all, replace the line. To tomplum I don't believe I have a seat issue because I purchased a new upper halve of the carb which has the seat in it. I put a new need valve and installed it into the old lower half of the carb then I started the engine and I had the same promlem My particular carb does not have a wire holding in the needle valve.

It has a groove that slides into the float. To Bill Kapaun I did flush the line real good. All the way from the tank to the carb. The fuel line is not cracked or rotted. To Tomplum No I took the pump apart and checked the gaskets and springs. Everything looked ok. I figured if the pump was bad it would be pumping not enough gas, Correct Not more gas! Have you ever heard of a pump being defective by pumping too much gas? If so I will replace the entire pump with a new one.

Did you figure out what it was? I need to fix mine and it would be great to see what the problem was? Indem Sie weiterhin auf der Website surfen bzw. Mehr erfahren.