Symptoms
- Pull cord resists or engine won't fire
- Engine turns over but doesn't start
- Engine starts then dies immediately
- Sat unused since last season
Likely causes
- CommonTrigger gun not squeezed during startMany pressure washers need the trigger held to relieve pump pressure before the engine will start.
- CommonStale fuelOld gas gums the carburetor.
- CommonFouled spark plugCarbon buildup weakens spark.
- PossiblePump not primed with waterRunning the pump dry can cause it to seize or the engine to stall.
- PossibleClogged carburetorVarnish deposits from old fuel block small passages.
What to do
- Connect the water supply and squeeze the trigger gun to purge air and relieve pressure before pulling the starter.
- Drain stale fuel and refill with fresh gasoline.
- Pull the spark plug and check for fouling; clean or replace it.
- Check the air filter and clean or replace if dirty.
- Make sure water is flowing to the pump before starting; never run it dry.
- Check the choke and throttle are set correctly for a cold start.
- If it still won't start, the carburetor may need professional cleaning.
Tools and parts
- Spark plug socket
- Fresh gasoline
Pressure washer spark plugSearch: “pressure washer engine spark plug”
When to call a pro
A small-engine shop can service the carburetor if fuel and ignition checks don't get it started.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.