Asked by: Sarai Uguccioni
asked in category: General Last Updated: 20th February, 2020

Why does my riding lawn mower surge?

This vent is just large enough to allow air into the tank, creating enough backpressure to aid in fuel delivery to the carburetor. Surging is also caused by water that got into the fuel. A mower left in a heavy rain or condensation on a hot summer day can choke the engine.

Click to see full answer.


Correspondingly, why is my Briggs and Stratton surging?

The Surging Test As you know, gas starvation causes an inconsistent flow of fuel which in turn causes erratic running. And, you also know a vacuum leak will cause erratic running, but is a much less common cause. To quickly diagnose which problem you have, follow this simple test.

Subsequently, question is, what causes a carbureted engine to surge? Incorrect idle speed settings or fuel mixture adjustments, and malfunctions in the fuel vapor recovery system can upset engine idle capabilities of carbureted engines. The appropriate fuel system cleaner added to the fuel tank can open clogged passages in injectors and carburetors that may be causing the surge.

Regarding this, why is my riding lawn mower sputtering?

A Mower Has to Breathe A dirty air filter inhibits the flow of air into the carburetor. Clean or replace the air filter to stop the mower from sputtering to a halt. Too much air can also cause problems for the engine. A bad cap on the gas tank is the first place to look.

What causes a lawn mower to rev up and down?

A carburetor that's incorrectly adjusted is a common cause of poor engine idling that results in hunting and surging. Fortunately, most lawnmowers have two screws that allow you to adjust the carburetor yourself. Then slowly adjust the screws tighter or looser in turn until the mower runs and idles smoothly.

31 Related Question Answers Found

How do you adjust the governor on a Briggs and Stratton engine?

What causes an engine to hunt and surge?

What causes backfiring in small engines?


How do you adjust the governor on a lawn mower?

Where is the governor on a riding lawn mower?

How do you adjust a Briggs and Stratton carburetor?


Why is my lawn mower backfiring through the carburetor?

How do you clean a Briggs and Stratton carburetor?

What is surging and choking?


Why does my Briggs and Stratton engine backfire?