Pressure washers & generators

Pressure washer won't start

Gas pressure washers usually won't start due to stale fuel, a fouled spark plug, or the trigger not being squeezed to release pressure; electric models are usually a power or GFCI issue.

Difficulty
Easy
Time
15–45 minutes
DIY cost
$5–$25
Pro cost
$60–$150

Symptoms

  • Pull cord is hard to pull or engine doesn't fire
  • Electric motor makes no sound at all
  • Engine turns over but won't catch
  • Starts briefly then dies immediately

Likely causes

  • CommonTrigger not squeezed before startingMost gas pressure washers need the trigger held open to release built-up pressure so the pump isn't fighting the engine at startup.
  • CommonOld or stale gasolineGas older than 30 days can gum up the carburetor and prevent a clean start.
  • CommonFouled spark plugCarbon buildup on the plug prevents a strong spark, especially after storage.
  • CommonTripped GFCI outlet or breaker (electric models)Electric pressure washers require a grounded, working GFCI outlet; a tripped one cuts all power.
  • PossibleWater not connected or turned onMany models have a safety feature that won't let the engine run without water flow to protect the pump.

What to do

  1. Confirm the garden hose is connected and turned on, and squeeze the trigger to bleed air and confirm water flows from the wand.
  2. On gas models, hold the trigger open, then pull the starter cord or press the electric start.
  3. Check the oil level (if applicable) since many small engines have a low-oil shutoff that prevents starting.
  4. Check the fuel: if it's been sitting more than a month, drain it and add fresh gasoline.
  5. Remove and inspect the spark plug; clean off carbon deposits or replace it if it looks worn or oily.
  6. For electric models, press the GFCI outlet's reset button and try a different outlet to rule out a tripped circuit.
  7. Check the on/off switch and any safety interlock on the trigger gun for damage or debris blocking it.
  8. If the engine still won't fire with fresh fuel, good spark, and water flowing, the carburetor may need cleaning by a small-engine shop.

Tools and parts

  • Spark plug socket or wrench
  • Fresh gasoline
  • Garden hose
Small engine spark plugSearch: “pressure washer spark plug replacement”
Small engine carburetor cleanerSearch: “carburetor cleaner spray”

When to call a pro

If the engine has fuel and spark but still won't run, or if you smell gas after several attempts, stop and take it to a small-engine repair shop.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.