Symptoms
- No detergent draws even with the correct nozzle
- Visible crack or split in the small clear tube
- Tube has come off its fitting inside the housing
- Detergent draws very inconsistently
Likely causes
- CommonTube cracked from age, sun exposure, or being pinchedThis small tube is often exposed near the base of the machine and can crack over seasons of use.
- CommonTube popped off its barbed fittingVibration or an accidental tug can pull it loose.
- PossibleFilter/strainer at the tube's end is cloggedA clogged strainer can look like a tube problem but is a separate small part at the tube's tip.
What to do
- Locate the detergent siphon tube, usually running from a fitting on the machine down into the detergent bottle.
- Check the full length for cracks, splits, or kinks that could let air in instead of drawing liquid.
- Confirm the tube is fully seated on its barbed fitting at the machine end; push it back on firmly if loose.
- Inspect and clean the small strainer/filter at the bottom end of the tube.
- Replace the tube if cracked; these are inexpensive and usually just need to be cut to length and pushed onto the fitting.
- Test with the correct low-pressure soap nozzle installed after reattaching or replacing the tube.
- If detergent still won't draw with a new tube, the issue is likely the internal injector valve rather than the tube.
Tools and parts
- Utility knife or scissors (to cut new tubing to length)
Pressure washer detergent siphon tubeSearch: “pressure washer soap siphon hose replacement”
When to call a pro
This is a simple DIY part swap; a pro isn't usually needed unless the internal injector valve is also suspected.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.