Generator hard to start, running rough, or dying under load? A clogged carburetor is the most common generator problem, and it nearly always comes from fuel left sitting until it turns to varnish.
Here is why the carburetor clogs and how to clean it.
This article will teach you:
- What the carburetor does
- Why it clogs
- How to clean it
- How to prevent it
Why the Carburetor Clogs
- Stale fuel leaving varnish in the jets.
- Ethanol fuel attracting moisture.
- Debris in the fuel bowl.
- Long storage with fuel in the system.
What You’ll Need
- Carburetor cleaner
- A socket set and screwdriver
- Your owner’s manual
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How to Clean a Generator Carburetor
- Shut off the fuel. Close the fuel valve and drain the bowl.
- Remove the bowl. Take off the float bowl and inspect for varnish.
- Clean the jets. Spray carburetor cleaner through the jets until clear.
- Refill fresh. Reassemble and run fresh, stabilized fuel.
Pro Tip: The main jet has a tiny hole that clogs first. Make sure carburetor cleaner sprays cleanly through it, since even a partial blockage there causes hard starts and surging.
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Ask the forum →80,000+ solved repair threads · no account needed to readWhen to Look a Little Deeper
Because the carburetor is central to running, it helps to check related issues, and reviewing a surging generator, a clogged fuel line, or a generator that will not stay running can reveal the cause.
Because carburetor and fuel work is similar across small engines, guidance on cleaning and adjusting a carburetor and how to clean the fuel lines both help.
When to Call a Pro
If a thorough cleaning does not help, the carburetor may need rebuilding or replacing. A small-engine technician can do that quickly.
Related guides
- Battery Leaf Blower Troubleshooting for Weak or No Power
- Fixing a Clogged Carburetor in Your Leaf Blower
Wrapping Up
A clogged carburetor is usually stale fuel. Here’s the recap:
- Shut off the fuel and drain the bowl.
- Remove and inspect the bowl.
- Clean the jets fully.
- Run fresh, stabilized fuel.
Clean the carburetor and use fresh fuel, and it runs right. Stay safe.
When the test points to the part, shop generator parts for your model and confirm the fit with the full model number before ordering.
Still stuck after this guide?
Two free options: post your model number and symptom on the forum, or search the model number in the shop to see every part that fits.
