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I have a 66 Valeint Wagon. I have carburetor problems. I need a diagram. The needle and seat doesn't get enough gas.

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Humm, well, I suggest that you do a fuel pressure and VOLUME test. Not enough gas cannot be controlled by needle and seat. What happens is the screen in the tank often gets plugged, and that will show under the VOLUME test.

Posted on Sep 06, 2010

  • Mike Sep 06, 2010

    Also. the diagram can be found in the documentation in a carb rebuild kit.



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Own Kubota ZG222 zero turn lawn mower. Leaking gas, no start. Pulled the oil dip stick- gas flowed out. Gas entering engine. Can this be repaired without replacing the entire carb?

Yes, it should be able to.. take the carb to a qualified professional.. the needle and seat assy may have dirt/crude in it, ... (the needle and seat are what controls the flow of gas into the float bowl)..preventing the needle from seating and stopping the flow of gas..this is why the engine filled with gas.. drain the oil...let the engine "air out" for a while.. R&R the oil filter... install a new gas filter (or 2)..The mechanic will be able to tell you whether the seat can be replaced.. some are pressed/swedged in place and cannot be removed, the needle has a "rubber" seal where it meets the seat.. if its damaged it must be replaced..( I would replace it anyway - cheap insurance)..UNLESS something is actually broken, you DO NOT need a new carb!!!

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What the cause of the carborador is always over flow of gas??

The float height in the bowl is set to high or the needle and seat is not closing correctly.

Feb 01, 2015 | Cars & Trucks

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I have a 22re toyota pick up with weber carburetor it takes a long time to start in the mornings battery even dies sometimes before starting what do you recomend

Check that your choke is working properly.
Start with a tune-up, new gas filter, air filter if dirty, oil and oil filter, spark plugs, distributor cap and rotor. If your spark plug wires are old, buy a new set, or test yours with an ohmmeter.
If still bad, check if your fuel pump is putting enough gas into the carburetor. Take the gas line off at carb. and check volume flow into a container. Also the carb may need adjustments-maybe the fuel level in carb. bowl is too low-would need to raise float height. Check if the needle valve and seat at the gas inlet to carb is not clogged or stopped from trash or debris.
Look down the throat of carb and watch for gas jetting out when you open the throttle to wide open-you should see gas spurt downward, if not, the carb needs some work to it.
Is your choke adjusted right? Sounds like it may not be-the choke flap should be nearly closed when starting, partially open after running, and fully open after the engine warms up.
Other problems could be weak ignition components-possibly a coil or igniter-what Toyota calls an ignition module.
Post back with what you find. Webers are great carburetors-much better than stock.

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1 Answer

My step son took my truck for an apparent joy ride while drunk, ran it cout of gas, even in carburator, put new fuel in and now it is bogged down, wont stay running, and lots of black smoke pouring out...

Sounds like a flooded carburetor. Possibly float needle dropped since bowl was not full enough to keep float needle in place. This could be from improper adjustment during carburetor overhaul. When floats are set, some have adjustments for both top cutoff and bottom drop.

Now if black smoke is not from exhaust pipes, you have a bigger problem. Could new fuel be contaminated with diesel? Also depending on carburetor type, the rear barrels of a 4 barrel carb can soot up if the rear barrels are not often open. Some rear barrel actuators are vacuum operated, others are mechanical links.

Some other thoughts are metering rods can be extended and jam if either the seat unscrews or the rod hangs up. Not common, but possible. Free floating rust could jam the metering rod in almost any position. When placing a carburetor on the intake manifold, NEVER turn the carburetor upside down or at any angle that the truck would not normally go. The float pin can slide out of some models.

Also, was the gas used from a 2 cycle engine like a boat or lawnmower that has oil in the gas?

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1 Answer

Car will start only when gas is poured into the carburetor and then immediately stops.

There may be a little screen filter inside the fitting where gas enters the carburetor, might have got plugged. The needle valve just inside the carb whereby the float controls the entrance of gas, may have got stuck in its seat. Or the seat, where gas enters the carb., may have something lodged there.
If you are pretty sure the pump's volume and pressure is correct, (it would be low pressure, like around 5 lbs., and you check volume by timing how long it takes to fill a specified amount-sorry, I don't know or remember any specs anymore- but anyway, you must have taken the line off at carb to check for gas to carb-if it squirted out at a good clip when it was cranked over, it likely passed the test-hows that for accuracy? lol.), but as I was going to say, if you have gas to carb., and no amount of pumping the throttle lets any gas through, you will want to take the carburetor off and have a minor rebuild kit installed, just all new gaskets and seals, rubber or leather parts that get old and leaky, new needle valve and seat.
If you want to just check the bowl inside for gas in it, and the needle valve, too-it can get pretty tricky, but you could take off the top of the carburetor, called the air horn, held by its several screws, and tricky because you have to unhook the choke rod, maybe anything else for getting the top off...If you take it off, you will want a new gasket there...I recommend just taking the carburetor off. Has this car ever sat for a long time? The carb. would need a good and thorough cleaning of every little passage to bring it back to like new condition..
Good luck. It might be something simple, like a bad needle valve, or a filter, wow, what a slam dunk that would be. Wouldn't even have to pull the carb off.

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1 Answer

I have a 1999 yukon that keeps having fuel delivery issues. I sometimes have to put gas in the carburetor just to start it. It will run for about 30 secs and then starts to choke. It then dies on me. It...

Sounds like a weak fuel pump.Check the fuel pressure it should be 60-66 psi with key on and engine off.If its below 52 then it does not have enough pressure to open the popit valve in the injector to allow fuel thru.

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Gas is dumping out of my carb from all seams 1986 w100 dodge 318

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