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HomeRepair HelpGenerac RepairGenerac Pressure washer starts then stalls Repair
Generac Pressure washer starts then stalls
When your Generac gas pressure washer starts then stalls, the most common cause is a clogged carburetor, especially when stale or ethanol-blended fuel has been left in the carburetor during seasonal storage. Evaporated fuel can leave a sticky residue that restricts fuel flow, causing the pressure washer to start and stop, start then die, or run for only a few seconds. Clean the carburetor with carburetor cleaner first; if that does not solve the problem, the carburetor or carburetor repair kit may need to be rebuilt or replaced. A clogged fuel filter is the next likely cause, so drain old fuel from the fuel tank and replace the filter if necessary. A blocked fuel cap vent can also create a vacuum in the tank. If slightly loosening the cap keeps the engine running, replace the fuel cap. A clogged air filter can restrict airflow and make the engine stall, while a blocked pre-cleaner is possible but less common. Before servicing any part, shut off the gas pressure washer and disconnect the spark plug wire. Enter your model number to find the exact replacement part for your specific Generac pressure washer.
01 - Generac 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 stall. 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 - Generac 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 stall. 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 - Generac 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 stall. 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 - Generac Fuel Cap
As fuel is consumed by the engine, the level in the fuel tank lowers. To make up for this, the fuel cap uses a small vent to allow air to enter the tank. If the fuel cap vent is clogged, air won’t be able to enter the tank and a vacuum or “vapor lock” will occur. This stops the flow of fuel to the carburetor causing the engine to stall. To determine if the fuel cap vent is clogged, try slightly loosening the cap and then starting the engine. If loosening the fuel cap allows the engine to stay running it is likely clogged and will need to be replaced.
Highly Likely
05 - Generac 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 stall. If the air filter is clogged, replace it.
Highly Likely
06 - Generac Pre-Cleaner
The pre-cleaner might be clogged. However, this is rare.
Highly Likely
Frequently Asked Questions
Why does my Generac pressure washer start then stall?
How do I know if the fuel filter or fuel cap is making my pressure washer shut off?
Can a dirty air filter cause a pressure washer to start and stop?
How do I find the correct Generac pressure washer carburetor or fuel part?
What safety steps should I take before repairing a Generac pressure washer that keeps stopping?
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