Top reasons why your generator cranks but won’t start

So, you’ve got everything set to fire up your generator, but even though you hear it cranking, it just won’t start. It’s a common problem that’s both frustrating and confusing. Figuring out why can get your generator humming again.

Keep in mind, this info might not match your generator exactly. We aim to help with all sorts of DIY generator fixes, but different models can have unique steps and parts. For the best advice, it’s a good idea to check your generator’s manual or reach out to us if you’ve got questions.

Check your fuel: is there enough fresh gas?

When your generator cranks but won’t kick in, the fuel system is usually the first suspect. Generators need plenty of fresh fuel to run properly. Gasoline can go stale over time, causing starting problems.

• Take a look inside the fuel tank to see if it’s got enough gas.
• If the gas has been sitting there for over a month, you might want to drain it and fill up with fresh fuel.

Tweak the choke lever

The choke manages the air and fuel blend during startup. Checking that the choke lever is set correctly can make all the difference.

1. Set the choke lever to the right position for a cold start (usually fully closed).
2. Once the engine’s running and warmed up, move the choke to the open position.

Test the battery

If the battery’s weak or dead, it won’t provide enough juice to start the engine.

1. Grab a multimeter to test the battery voltage. A fully charged battery should read about 12.6 volts.
2. Look over the battery terminals for any corrosion. Clean them up if needed.
3. If the battery’s old or isn’t holding a charge, you might need to replace it.

Inspect the spark plug

A bad spark plug can keep the engine from igniting the fuel mix.

1. Find the spark plug wire and pull it off.
2. Use a spark plug socket to take out the plug.
3. Look for wear, carbon buildup, or any damage.
4. Clean the spark plug with a wire brush or swap it out if needed.

Swap out a dirty air filter

You need the right air-fuel mix for the engine to fire up. The air filter keeps dust and junk out, but it can get clogged over time.

1. Find the air filter housing, it’s usually on the side of the generator.
2. Pop off the cover and pull out the air filter.
3. If it’s dirty or clogged, put in a new one.

Look for blocked fuel filters

Fuel filters keep junk out of the engine, but if they get clogged, fuel can’t flow properly.

1. Find the main fuel filter, it’s typically along the fuel line.
2. Take out the filter and check for dirt or blockages.
3. If it’s clogged, swap it out for a new one that fits your generator.

Bleed air from the fuel system

Sometimes, air gets trapped in the fuel lines, stopping fuel from getting to the engine.

1. Locate the bleed fitting on the secondary fuel filter or injection pump.
2. Crack open the fitting to let the trapped air out.
3. Use the generator’s primer bulb or a small lift pump to push fuel through until it’s all fuel with no air bubbles.

Clean a clogged carburetor

Old fuel can cause varnish to build up in the carburetor, which blocks fuel flow.

1. Empty out any old gas from the tank and carburetor.
2. Take off the carburetor bowl to get to the insides.
3. Spray carb cleaner to get rid of debris and buildup.
4. Put the carburetor back together and fill up with fresh fuel.

Check electrical connections

Loose or corroded wires can mess up the starting circuit.

1. Check all the wires hooked up to the starter, ignition switch, and battery.
2. Look out for damage, frayed wires, or corrosion.
3. Tighten up any loose connections and swap out bad wires if you have to.

Wrapping up

When you need parts or maintenance supplies for your generator, swing by AppliancePartsPros.com. We’re here to help you keep your appliances running like a charm. Don’t forget to follow us on Facebook and Twitter for more tips and updates.

If you’ve got any questions or need a hand, don’t hesitate to reach out to us. We’re always happy to help!