Quick Tips To Find/Fix Your Carburetor & Fuel Supply Problems
When you go to turn on any small engine or motor, you expect it to start—hopefully on the first try. However, issues within the fuel system or fuel supply, as well as trouble in the carburetor, can keep that from happening.
But before you can get to fixing things, you have to know what the problem is. That means it's time to do some troubleshooting. Ready to put on your mechanic hat? We’re going to run through some quick points that can get you pointed in the right direction to solve your engine woes.
SIGNS YOUR CARBURETOR MIGHT NEED REPAIRED OR REPLACED
1. The tip of the spark plug is dry
If you can’t get your engine to turn over after several tries, remove a spark plug. The tip of the plug should be wet if the engine is getting proper fuel flow. However, if it’s dry, there’s likely a break in the transfer of the fuel.
2. The engine will not keep running with the choke turned down
Normally you would set your choke to start your engine and then turn it down once the motor is running smoothly. However, if the engine will only run if the choke is halfway open or more, there could be a flow problem.
It’s possible that the jet or one of the passageways in the carb is either partially or fully blocked. In this case, the carburetor should be cleaned or repaired/replaced.
3. The engine periodically increases and decreases RPMs after being started
This is another sign that something could be restricting the proper flow of fuel and that your carburetor should be cleaned and repaired or replaced.
FUEL SYSTEM: OPTIMAL ENGINE OPERATION REQUIRES OPTIMAL FLOW
1. Check to make sure the fuel you're using isn't old
Bad gas can cause a multitude of problems, now and in the future.
Pro tip: expired gas has a different odor than fresh gas, so if your fuel has gone bad, you'll probably be able to smell the difference.
2. Ensure your fuel shut-off valve is in the "on" position
No flow = no go.
3. Make sure your cap can vent air
Fuel flow is directly impacted without a way to release pent-up pressure in the tank.
4. Does your fuel filter need replaced?
Just like they have air and oil filters, engines have a fuel filter to prevent debris getting in your system, and from time to time you'll need to install a new one.
5. Keep your fuel lines at an adequate distance from any heat sources
Wrapping up
Issues with your carburetor or fuel certainly aren’t convenient. However, you do have several options that may help you identify and fix the problem on your own. With some time and effort (and perhaps a bit of luck), you can get your small engine going again.
Depending on what equipment you're repairing, you may find it helpful to check out our other troubleshooting articles as well, like our mower troubleshooting guide or our pressure washer troubleshooting guide.
Don’t forget, The ROP Shop is here if you need replacement parts for your equipment.
[EDITED 10/2023]
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