Sylvie Willis
Replacing the fuel lines on a 2-cycle engine can be a tricky task. There are a few steps to follow to ensure that the fuel lines are correctly installed, including submerging the ends of the fuel lines in 2-cycle fuel and testing the line configuration by depressing the primer bulb. If bubbles emerge from the primer assembly's return line, this indicates that the line routing is correct. However, if the primer bulb becomes stuck or returns very slowly after being depressed, this suggests that the line configuration was guessed incorrectly and the test must be conducted again.
| Characteristics | Values |
|---|---|
| How to test the orientation of the fuel lines | Submerge the ends of both fuel lines in 2-cycle fuel and test the line configuration by depressing the primer bulb |
| What to do if the primer bulb becomes stuck or returns slowly | Reverse the lines and perform the test again |
| What to do if fuel is pushed out of the unfiltered line | The orientation was guessed correctly and the test is complete |
| What to do if bubbles emerge from the line with the fuel filter | The lines were installed incorrectly, must be switched, and then tested again |
| What to do if bubbles emerge from the primer assembly's return line | The line routing is correct |
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What You'll Learn
Testing the orientation of the fuel lines
Bubbles emerging from the primer assembly's return line indicate that the line routing is correct. If the primer assembly return line is lifted out of the fuel while priming, fuel will be seen squirting from the line. This verifies that the new fuel line placement is correct.
If the primer bulb becomes stuck or returns very slowly after being depressed, then the line configuration was guessed incorrectly and the test must be conducted again. In this case, reverse the lines and perform the test again. If the primer bulb sticks or returns slowly in the first test, switch the positions of the fuel lines on the carburetor and perform the test again.
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How to tell if the line routing is correct
To tell if the line routing is correct, submerge the ends of both fuel lines in some 2-cycle fuel and test the line configuration by depressing the primer bulb. If bubbles and/or fuel emerge out of the primer assembly return line, then the line configuration was guessed correctly and the test is complete. Bubbles emerging from the primer assembly's return line is a sign that the line routing is correct.
If the primer bulb becomes stuck or returns very slowly after being depressed, then the line configuration was guessed incorrectly and the test must be conducted again. If the primer assembly return line is lifted out of the fuel while priming, fuel will be seen squirting from the line.
If the line has a fuel filter, then the orientation is correct if fuel is pushed out of the unfiltered line. If bubbles emerge from the line with the fuel filter, then the lines were installed incorrectly and must be switched and then tested again.
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What to do if the primer bulb becomes stuck
If the primer bulb becomes stuck, there are a few things you can try. Firstly, check the line configuration by submerging the ends of both fuel lines in some 2-cycle fuel and depressing the primer bulb. If the primer bulb returns slowly, switch the positions of the fuel lines on the carburetor and test again. If the primer bulb is still stuck, you may need to replace it. To do this, look for the two tabs on either side of the plastic housing where the primer bulb is inserted. Using a small screwdriver, push these tabs inward to release them and slide the whole thing out. You can purchase a new primer bulb from a lawnmower dealer, which should come with a new mounting ring.
If you are unable to remove the old primer bulb, you may need to try pressing down on the bulb while holding your finger on the part of the line that leads to the tank. Release the bulb and, with a bit of luck, it should draw fuel. If this doesn't work, you may need to diagnose the problem further. A stuck or plugged check valve in the carburetor can cause the bulb to remain down or be slow to return, as can a plugged fuel filter.
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How to reverse the lines
To reverse the lines of a 2-cycle fuel system, you must first test the orientation of the fuel lines. Place the ends of both lines in 2-cycle fuel and then prime the bulb. If fuel is pushed out of the unfiltered line, the orientation is correct. If bubbles emerge from the line with the fuel filter, the lines have been installed incorrectly and must be switched and tested again.
If the primer bulb becomes stuck or returns very slowly after being depressed, the line configuration was guessed incorrectly and the test must be conducted again. Switch the positions of the fuel lines on the carburetor and perform the test again.
Bubbles emerging from the primer assembly's return line indicate that the line routing is correct. If the primer assembly return line is lifted out of the fuel while priming, fuel will be seen squirting from the line. Bubbles out of the unfiltered return line verify that the new fuel line placement is correct.
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Fuel line routing for remote primer 2-cycle engine carburetors
To replace 2-cycle fuel lines, you need to test the orientation of the fuel lines by placing the ends of both lines in 2-cycle fuel and then priming the bulb. If fuel is pushed out of the unfiltered line, then the orientation was guessed correctly. If bubbles emerge from the line with the fuel filter, then the lines were installed incorrectly and must be switched.
Fuel line routing for "remote primer" 2-cycle engine carburetors is more complex than the routing of local primer carburetors because of the addition of a third line. The primer assembly needs to pull fuel through the carburetor, not push the fuel into the carburetor. The fuel line ensures that the fuel flow remains uninterrupted, and the engine runs without any issues.
To determine the correct fuel line routing for remote primer carburetors, you need to test the primer assembly. Fuel only flows one way through primer assemblies. Bubbles out the unfiltered return line verify that the new fuel line placement is correct.
In two-cycle engines, one fuel line is connected to the carburetor that starts from the fuel tank. Another fuel line travels from the carburetor to the primer bulb. There’s another line that connects the primer bulb to the fuel tank. The function of this particular line is to deliver fuel from the tank to the carburetor continuously when the engine is running. The next line connects the carburetor to the primer bulb. The function of this line is to suck unused fuel back from the carburetor into the primer bulb.
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Frequently asked questions
Submerge the ends of both fuel lines in 2-cycle fuel and test the line configuration by depressing the primer bulb. If bubbles and/or fuel emerge out of the primer assembly return line, then the line configuration was guessed correctly.
The line configuration was guessed incorrectly and the test must be conducted again. Reverse the lines and perform the test again.
Bubbles out the unfiltered return line verify that the new fuel line placement is correct.
