Walbro Carburetor Fuel Line Diagram 

When you need to hook up your carburetor, you may need to know which fuel line goes to the carburetor and which goes back. To make things simpler, we have an easy-to-use diagram that will explain everything about your carburetor’s fuel line.

Which Fuel Line Is The Return Line?

There are two fuel lines on a carburetor: the inlet and return. The inlet has a larger diameter than the return line. The return line goes from the fuel tank to the carburetor. The return line enters the fuel tank on the side closest to the fuel cap. The fuel line in a Walbro carburetor has two connections. The first hooks up to the suction side of the primer bulb (the shorter stem). The other connection feeds fuel back to the tank through the breather valve. The return line includes a nozzle. This nozzle has a diameter of about 0.031 inches. The nozzle is adjacent to the carburetor’s outlet side and off-center from the fuel bowl. The return line also has an orifice.

Before testing the carburetor, determine which fuel line is the return line. This enables you to determine if the carburetor has the proper filtration. You will need to reverse the fuel lines if you’ve had any problems. Once you have determined the correct fuel line, the next step will be cutting the fuel line to fit the carburetor. The thickest fuel lines are the toughest to cut, and you may need to cut the line several times until no kinks remain. You will need long needle-nose pliers for this job.

What Fuel Line Goes To The Carburetor?

You need to know the direction of the fuel line if you are going to perform any repair or maintenance on your carburetor. A common mistake is the incorrect orientation of the fuel line. This is because manufacturers do not permanently mark the ingoing and outgoing fuel lines. The carburetor pictured below is a typical “local primer” carburetor design. The fuel line for the Walbro carburetor connects to the fuel tank with two connections. One is on the side of the central fuel adjusting screw, and the other goes to the primer bulb. The line hooks up to the suction side of the primer bulb. This is the side of the carburetor that draws fuel from the tank. The other connection hooks up to the return fuel line.

A smaller diameter line connects to the carburetor’s main fuel inlet. The more extensive line goes to the priming bulb. This nipple pulls fresh fuel from the fuel tank and pushes air back into the tank. There is another small hole in the tank for the fuel filter. The fuel line for a remote primer carburetor is more complicated than that for a local primer carburetor. A third fuel line must connect to the primer assembly in remote primer carburetors. It must be connected in the proper direction to feed the carburetor.

Where Does The Fuel Line Connect To The Carb?

There are two main places where the fuel line connects to a Walbro carburetor. The first is to the side of the idle screw, which is often located next to the central fuel adjusting screw. The second is to the suction side of the primer bulb. Usually, the suction line is short, while the return fuel line is longer. Once you have found the fuel line, you need to cut it so that it fits snugly into the carburetor and the primer. You will need a pair of long needle nose pliers to cut the fuel line. The thickest lines are the most difficult to cut, so you will need to do this several times until you find no kinks in them.

The fuel line for a Walbro carburetor connects to a giant hole in the fuel tank. To keep it from coming out, you can use a nylon nipple connector to hold it in place. The diameter of the line should be about 1/2″. If unsure which port is incoming or outgoing, you can check the connection with the carburetor. There are two ports on the carburetor. The port on the incoming line connects to the incoming port, while the other port connects to the second port. If you are unsure about which port is the incoming fuel port, you can submerge the carburetor port in two-cycle fuel to test the configuration.

The more extensive fuel line connects to the main fuel inlet on the carburetor, while the smaller one connects to the primer bulb. The other connection connects to the longer one on the primer, which dumps fuel into the tank. Connecting the two lines to the carburetor is essential, as the fuel line in the tank connects to the primer.

How Do You Hook Up A Carburetor Hose?

Fuel lines can get messy, especially when the car is running. You should route them away from moving parts like wheels or tires. This will prevent them from getting damaged by heat. Fortunately, the process is not as complicated as it may seem. The first step is to measure the distance from the fuel pump to the carburetor. After measuring, cut the fuel line to the correct length. Then, attach the smaller hose to the fuel pump side, and the larger hose to the primer area on the carburetor.

When you reverse the fuel lines, you can test the piping connections. You need to know which one goes in and which one goes out. Then, you need to know which ports on the carburetor are used for priming and which are for fuel. The diameter of the line should be about 1/2″. If unsure which port is incoming or outgoing, you can check the connection with the carburetor. There are two ports on the carburetor. The port on the incoming line connects to the incoming port, while the other port connects to the second port. If you are unsure about which port is the incoming fuel port, you can submerge the carburetor port in two-cycle fuel to test the configuration.

The more extensive fuel line connects to the main fuel inlet on the carburetor, while the smaller one connects to the primer bulb. The other connection connects to the longer one on the primer, which dumps fuel into the tank. Connecting the two lines to the carburetor is essential, as the fuel line in the tank connects to the primer.

 

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