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HomeRepair HelpRepairPressure washer runs rough Repair
Pressure washer runs rough
If your gas pressure washer is running rough, surging, sputtering, hesitating, or bogging down under load, start with the carburetor. A clogged carburetor is the most common cause, especially when stale or ethanol-blended fuel has been left in seasonal equipment. As fuel ages, it can leave a sticky residue that blocks the carburetor passages, so clean the carburetor with carburetor cleaner. If cleaning does not correct the problem, install a carburetor repair kit or replace the carburetor. Next, check the fuel filter, which can also become restricted by old fuel. Drain the fuel tank and replace the filter if needed. A clogged fuel cap vent can limit airflow into the tank and make the pressure washer engine run poorly, so briefly loosen the cap while testing. If the engine runs better, replace the fuel cap. A clogged air filter can also cause a rich fuel mixture and rough running, while a blocked pre-cleaner is less common. These checks address common pressure washer carburetor problems and an engine cutting out or running rough. Enter your model number to find the exact replacement part for your specific pressure washer.
01 - Carburetor
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the pressure washer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to run roughly. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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02 - Carburetor Repair Kit
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the pressure washer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to run roughly. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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03 - Fuel Filter
The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving fuel in the pressure washer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the fuel filter and cause the engine to run roughly. If old fuel was left in the pressure washer, drain the old fuel from the fuel tank and replace the fuel filter.
Highly Likely
04 - Fuel Cap
As fuel is consumed, the pressure in the gas tank rises. To relieve this pressure, the gas cap uses a small vent to allow air to enter the gas tank. If the gas cap vent is clogged, air won’t be able to enter the gas tank, and the pressure in the tank will begin to rise. When the pressure in the gas tank exceeds the pressure in the engine, the engine will stall or run poorly. To determine if the gas cap vent is clogged, try slightly loosening the gas cap and then starting the engine. If the loosening the gas cap allows the engine to stay running, this indicates that the gas cap vent is clogged. If the gas cap vent is clogge...
Highly Likely
05 - Air Filter
The air filter may be clogged. If the air filter is clogged, the engine will get too much fuel and not enough air. As a result, the engine may run roughly. If the air filter is clogged, replace it.
Highly Likely
06 - Pre-Cleaner
The pre-cleaner might be clogged. However, this is rare.
Highly Likely
07 - Spark Arrestor
The spark arrestor is a small screen that prevents the engine from emitting sparks. Over time, the spark arrestor can become clogged with soot. If the spark arrestor is clogged, the engine may run roughly. To unclog the spark arrestor, remove it and clean it with a wire brush. You may also replace the spark arrestor.
Highly Likely
Frequently Asked Questions
Why is my gas pressure washer running rough or surging?
Can a clogged fuel filter or fuel cap make a pressure washer run poorly?
What should I check if my pressure washer starts and then stalls?
How do I find the correct pressure washer carburetor or repair kit?
What safety steps should I follow before repairing a pressure washer that runs rough?