Gas Pressure Washer: Why is the spray from my pressure washer weak?
An insufficient water supply can cause low pressure at the pressure washer's nozzle. Check the water pressure at the source and the flow connected to the inlet of the pressure washer. Check the inlet screen for a clog that could be blocking inlet water flow.
Check whether a low-pressure spray tip is installed on the wand; if so, install a different nozzle. A problem with the wand or pressure hose can also cause low nozzle pressure. Clean or replace the wand if necessary. Replace the pressure hose if it's clogged.
A pump failure can cause low nozzle pressure. Replace the pump check valves or replace the entire pump if it doesn't build up adequate spray pressure. A stuck unloader valve can also cause low pressure at the nozzle. Replace the unloader valve if it sticks open and constantly recirculates water back to the pump inlet.
THESE REPAIRS MAY HELP SOLVE YOUR GAS PRESSURE WASHER PROBLEM
Replace the pressure washer pump check valves
The check valves are spring-actuated pump valves that allow water to flow in one direction from the pump inlet to the pump outlet. If the check valves are worn out or defective, the pressure washer won't spray. Inspect the pump check valves and replace them if worn or defective.
Pressure washer pump check valves
How to install a pressure washer check valve kit
If your pressure washer won't spray at all, the check valves might be damaged or worn. This repair guide gives step-by-step instructions on how to replace the pressure washer check valve by installing a check valve kit.
Replace the pressure washer pump
The pump creates the water pressure when the engine is running. If the pump isn't developing any water pressure, replace the pump assembly.
Pressure washer pump
How to replace a pressure washer pump
When a pressure washer doesn’t generate a powerful spray, the pump could be damaged. This easy-to-follow repair explains how to replace a pressure washer pump in just 30 minutes.
Replace the pressure washer unloader valve
The unloader valve reduces water pressure within the pressure washer pump when the pump runs but the spray wand isn't used, by recirculating water to the pump inlet. If the valve sticks in the closed position, the thermal relief valve frequently discharges hot water onto the ground because the unloader valve can't open to allow recirculation. If the pressure washer doesn't develop adequate outlet pressure, the unloader valve could be stuck open. Replace the unloader valve if it sticks in either the closed or open position.
Pressure washer unloader valve
How to replace a pressure washer unloader valve
If your pressure washer suddenly loses all pressure, the unloader valve could be broken. This step-by-step repair guide shows how to replace a pressure washer unloader valve in less than 15 minutes.
Replace the pressure washer pressure hose
If the water pressure hose leaks at the fittings, check each fitting for proper tightness. If you can't tighten the fittings, replace the pressure washer hose. Also replace the hose if it is split or damaged.
Pressure washer pressure hose
Symptoms for gas pressure washers
Choose a symptom to see related pressure washer repairs.
Main causes: using a high-pressure spray tip when applying detergent, clogged siphon tube, chemical injection system fai…
Main causes: overfilling engine with oil, improper fuel/air mixture, choke system problems, dirty carburetor, engine nee…
Main causes: broken recoil spring, damaged recoil starter…
Main causes: dirty air filter, stale fuel, clogged or dirty carburetor, bad unloader valve…
Main causes: insufficient water supply, clogged water inlet screen, clogged pressure hose, faulty pump check valves, stu…
Main causes: damaged recoil starter, oil inside cylinder, locked up engine piston…
Main causes: faulty unloader valve, bad pressure regulator…
Main causes: stale fuel, gummed up carburetor, engine needs tune up, throttle and choke controls need adjustment, bad re…
Main causes: pump running for more than 5 minutes when the spray wand isn't being used, faulty pressure relief valve, ba…
Repair guides for gas pressure washers
These step-by-step repair guides will help you safely fix what’s broken on your pressure washer.
How to install a pressure washer check valve kit
Air in the inlet water supply can damage the check valves. If the pump won’t build up pressure due to damaged check valv…
How to install a pressure washer O-ring kit
O-rings seal fittings on the pressure washer pump. Damaged seals allow water to leak from the pump. Follow these steps t…
How to install a pressure washer chemical injection kit
The chemical injection valve draws detergent into the pump. If it’s not drawing detergent, use a repair kit to replace t…
Effective articles & videos to help repair your pressure washers
Use the advice and tips in these articles and videos to get the most out of your pressure washer.
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