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check the water filter ---high pressurehose must have bbackpressure to develop pressure so disconecting it wont acheive ,much ,if you have agood water supply ,oil in the pump--- adjust pressure by srewing the brass fitting that the pressure hose attachesto, down that is clock wise a couple of turns or so and see if that makes a difference if not seals in the pumpmay be gone tha t should show by water in the oil
Leaving the engine running for more than two minutes without releasing pressure trigger causes aluminum pump to overheat and causing damage to the purmp, resulting in sudden low pressure. (see page 9 in manual)
That engine requires a separate gas and oil. There is an oil sump with oil level needle and cap on the side of the engine. This is where you fill it with special pressure washer pump oil available from any good outdoor store or place where pressure washers are sold.
As for gas, Unleaded or Premium unleaded gas will work fine. Try not to use any fuel with ethanol blends however.
Here is a list of oils that will give you an idea what to buy for the oil reservoir:
On the very bottom of the motor is a square plug to drain the oil. The machine must be elevated to allow the oil to flow into a drain pan. If you don't see a square plug then look for a small 1/4 inch tube coming from the bottom of the crankcase with a hex cap on the end of it. If you cannot find either of these, then you must turn the pressure washer on its side and drain it through the same plug you fill from.
I worked at a tool rental center while attending college and learned all about a variety of tools. We used hydraulic oil with anti-wear and rust inhibitor additives in our pressure pumps. Check at you local auto parts for this type of oil.