Hello NW,
Soap is only siphoned off when using a low setting or nozzle.
If you have interchanging nozzles, it's usually the black one. Look for the one with the widest opening.
On adjustable wands, use the lowest pressure setting.
Everything else is automatic.
Best regards
Mike
Not sure about the McCulloch , but most pressure washers will only draw the soap in low pressure mode. either turn or pull the nosel on the end of the lance to switch to low pressure. I hope this helps.
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