lawn mower ran out of gas won't start
Dry gas tank
Dirt in the carburetor
Air-locked gas system
Carburetor bowl cleaning
Carburetor bowl drain
Carburetor bowl drain bolt
This model has a drain bolt and so the bowl doesn't necessarily need to be removed.
With the bowl drain removed, gas should flow freely from the carb, if not check out fuel filter and needle seat for possible blockage.
Carburetor bowl removal
This is a common B&S engine and the bowl needs to be removed to drain the bowl, in addition it's very important to clean the fuel feed bolt, this is the most common cause of no starts on this type engine.
With the bowl removed, gas should flow freely from the carb, if not check out fuel filter and needle seat for possible blockage.
It’s worth noting, small engine carburetors cause lots of issues. I replace a ton, the symptoms can vary widely.
But hot starting issues is definitely one of them. However the customer usually complains about hard starting issues all the time, not just after running out of gas.
Some carburetors will be very obviously damaged (corrosion) but most won’t show any visible signs of damage or wear.
A faulty carburetor is on the list of suspects and will move higher on the list if you have removed the carburetor, cleaned it, and it made no difference.
It’s worth checking the gas can you used to fill the mower. We’ve all done it, put something other than gas in the mower. It’s a simple mistake especially if you’ve got some old gas cans from last season.
Gas only stays fresh for about a month, after that it can cause all sorts of running problems in a small engine.
If you thing your gas is the problem, go ahead and drain it out, put some fresh gas in and she should fire straight up. If she doesn’t go ahead and drain the gas bowl as per above.
If you find you don’t use up all the gas within a month, either buy less or use a gas stabilizer in the gas can. It keeps the gas fresh for up to two years, and better than that. It protects the fuel systems of all your small engine equipment, including two stroke kit.
You can check it out here on “Small engine repair tool page”
faulty auto choke
Auto choke is as you may know a feature that most modern mowers have as standard. Briggs and Stratton call theirs “Ready start”. The auto choke systems are very good but they aren’t without fault. Auto chokes can stick in the on position causing the engine to flood.
This however doesn’t have any relationship with mower running out of gas, that may be coincidence. A sticking auto choke can present as an intermittent issue or a constant.
You can easily check if the choke is functioning correctly. Remove the air filter when the mower’s hot, the choke plate shouldn’t be closed.
Remove air filter
auto choke on
Auto choke off
The final component on our list is the coil. The coil helps make the spark needed to ignite the gas inside the engine.
Coils have a tough job and are a common failure. A very common symptom for a failing coil is intermittent hot start problems.
While I know this isn’t exactly a fit for your symptoms as a failing coil has no relationship with a mower running out of gas, but that’s why it’s at the end of our list.
You can easily and quickly check your mower for spark I’ve covered it in this post “Mower hard to start when hot”
spark plug test
How do you fix a mower that won’t stay running? The carburetor needs to be removed and cleaned. If the carburetor is badly corroded, it will need to be replaced.