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Back behind the water outlet tube are components that have small orifices that become clogged from lime, clay, mud and other contaminants. Mud and clay mostly from well water. I've had over 60 pressure washers in the past three years. I bought them because they didn't work and I would repair the pumps unless they were cracked, then I would buy new pumps to install. It would help to know the pump model details or even the make. Faip, Himore, Annovi Reverberi etc...or even the pressure washer model number as long as it is the original pump. If it is an Annovi Reverberi then it could also be a bad shutter valve. Now there is a revised design of the shutter valve. The part number for that valve is AR42497.
When you say low pressure pump and high-pressure pump...?
Are you referring to low-speed water flow, and high-speed/Jets, waterflow?
do you have a one pump system with a two speed single pump? Or do you have two separate pumps?
Is one pump, which is normal, a two speed pump?
Answers to these questions, will help us, help you!
when the trigger for the wand is not pulled , there is a pressure relief valve that bypasses the water in the pump and so there is no pressure until the trigger is pulled again.
with the pump getting hot and not being able to pull the motor to restart, it indicates that that pressure relief valve has jammed ( faulty ) and the pump is running at full pressure all the time
That will heat the pump and stop the engine from restarting
That valve is where I would start looking for a problem
Ford Pick-Ups/Bronco 1976-1986 Repair Guide Electric Fuel Pump - Removal & Installation
electric pumps are used on fuel injected models; a low pressure boost
pump mounted in the fuel tank and a high pressure pump mounted on the
vehicle frame. Some models equipped with the 8-460 (7.5L) carbureted
engines use a single low pressure pump mounted in the fuel tank.On
injected models the low pressure pump is used to provide pressurized
fuel to the inlet of the high pressure pump and helps prevent noise and
heating problems. The externally mounted high pressure pump is capable
of supplying 15.9 gallons of fuel an hour. System pressure is
controlled by a pressure regulator mounted on the engine. With
internal fuel tank mounted pumps tank removal is required when
servicing the pump. Frame mounted models can be accessed from under the
vehicle. Prior to servicing release system pressure (see Fuel Supply
Manifold details). Disconnect the negative battery cable prior to pump
More details can find in autozone.com (free register); select the year, make, model and engine.
I hope help you with this (remember rated this help) Good luck.