Youtube Video On How To Put A Needle Valve Back In On Quadrajet Carburetor?

Are Quadrajet carburetors any good?

The truth is, a properly tuned Quadrajet can be just as efficient and reliable as a bolt-on substitute performance carburetor. The Quadrajet has many model designations; the most adaptable units were designated as 4M, 4MC and 4MV, and most were rated at 750cfm until 1972 when their rating was increased to 800cfm.

Where does the check ball go in a Quadrajet?

The aluminum, or smaller check ball should be at the bottom of the accelerator pump well. The larger check ball will go in the main discharge hole. The spring and T goes above the check ball. The spring simply puts a bit of pressure on the check ball, so it stays shut until there is some fuel pressure pushing it up.

How does a Quadrajet choke work?

When the engine is cold, the spring contracts and creates a pull on the choke to close. The throttle keeps it from closing as long as it is not disturbed. When the engine is started, the throttle should be tapped just a little to allow the choke to snap shut.

How do you unstick a quadrajet float?

if the float was stuck “up”, it should have been holding the needle against the seat.if the bowl was “dry”, the float would have been down and holding the needle openif it was stuck there, using the stick may have freed it up, allowing the float to rise and close the needle.

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What is a Quadrajet carburetor?

The Quadrajet is a “spread bore” carburetor; the primary venturis are much smaller than the secondary venturis. Most Quadrajets use a vacuum operated piston to move the primary metering rods to control the air-fuel ratio, allowing the mixture to be lean under low load conditions and rich during high load conditions.

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