I have a Northstar pressure washer powered by a honda GC160 engine. The last time i used it, water leaks from the bottom of the unit, whether it is running or not. When running, the pressure is fine. I have felt underneath and it appears that the water is coming from the second opening from the rear. Is there a pressure relief valve there. I have a manual but cannot find any descriptors for underneath the motor.

talk with a honda service shop
i suspect that it is a water drain tube to remove water from the bowl of the carby

• 10w30 hd motor oil

Cover soap inlet and retry. Mine will not pressurize without soap or without inlet covered.

go to YOUTUBE.

Hiand welcome to FixYa, I am Kelly.

GC160 is the engine number.... It does not tell me that pressure pump is on the unit.
There should be a large knob on the side of the pump head. That is the bypass / unloader valve. Removed that and clean the pump housing where the flat plunger mates to the bousing. Then disassemble the unloader vavle. Remove the lower part of it from the knob and clean off the corrosion and dirt from the plunger and spring. Clean everything brass.... Reassemble using what you could consider abnormal amounts of WHITE GREASE. Place a GOB of white grease into the pump housing be re-installing the unloader / bypass valve. Just remember when you hook up water for a funtional test, that your going to spray some off that extra white grease through the pump and wand nozzle.
This should get you going again. If not I need a model number for either the pump body or the whole pressure washer vs the Honda engine number of GC160.

Thanks for choosing FixYa,
Kelly

As far as the pump gose just use a 30 weight oil they call it pump oil but realy its a 30 weight oil if you want the # its AW-4085-0016 or equivlant . The engine oil is a 10 -30 in most tempatures they say use a 30 wight above 40 degrees but i use mobil one extend proformance 10 -30 all year long in all of my mechines and have never had any problems and there all honda engines . Just change the oil every year some of mind are 35 years oil and run perfictly

some pumps have a side glass and oil should be half of side glass and depends on manufacture oil is different if general pump you can use 30w non detergent

Being petrol driven, it may have a mercury kill switch which puts a ground on the ignition circuit stopping the engine if you move it. Perhaps for safety in case you overturn the unit somehow.

needs new pump

1999 campbell hausfield 1800 psi--2.2gpm. weak pressure at the nozzle. water sprays out, but with the pressure of a garden hose.