Engine runs , not getting any water flow when trigger pressed.

When the trigger is pressed, the engine should kick up to increase speed and thus pressure. There is a problem with either gas flow or the air is blocked (new air filter?), so I would start by cleaning the carb and make sure the small gas port is open (run a pipe cleaner through it).

There is a solenoid that activates when you press the trigger and allows water to flow. If it isn't stopping, you most likely have a bad solenoid. Take it to your local vac shop for repair.

Hi Cliff:
My experience is that the pump pressures prevent the engine from starting, so we hold the trigger while starting.
My brother has cut a wedge of wood that he uses to jam the trigger open to bypass the problem. It can get a bit wild if the wand is not secured when the unit is started..

This is two things. One is the back flow check valve to the soap line is leaking. The other is the pressure switch on the output side of the pump.

Hello,

Your machine is air locked. Air in the supply line reaches the pump and the pump cavitates, allowing very little water to get by. Since the pump is just chewing air, it is getting very hot, producing the result that you see.
With the engine off, turn on the supply water and allow it to flow through your washer. You may need to lock the trigger on the wand in the open position, or hold the trigger down while purging the supply line. Make sure that there are no kinks in the supply hose and that any loops in the hose are straightened out. Raise the hose above your waist and walk it the length of the hose to the washer, forcing any air pockets through the hose and through the machine. This entire process will take about 5 minutes or so.
Release the trigger, start the machine and get to work. If the machine doesn't put up enough full pressure when you crank it, try cranking it while holding the trigger open. Sometimes the overpressure valve sticks, and can prevent full pressure from being reached. Holding the trigger open bypasses this issue, but doesn't repair it.

Best regards, W/D--

Not knowing exactly what type of pressure washer you have, most are equipped with an "unloader valve" so the pressure bypasses. If this is malfunctioning, the pressure will build up and bog the engine down.

the problem is the heater is cloged you can drill it out to clean it

To determine if your problem is due to an easily replaceable part, follow these steps:

1. Connect the water supply hose, the pressure hose, and the wand WITHOUT any nozzle tip.

2. Turn on the water supply, and press the trigger until water is smoothly running out of the nozzle
after any air is all purged out. Release the nozzle trigger.

3. Start the engine, and let it warm up for about 30 seconds.

4. With the engine running smoothly, press the nozzle trigger. The water should flow out of the nozzle (without the tip installed) at a faster rate, while the engine noticeably loads down as it used to do before your "no pressure" problem. If it does not load down, turn it OFF, and disconnect everything, and contact a Karcher repair facility.

5. If the engine does load down, release the trigger, and install one of the nozzle tips (not the black one).

6. Press the trigger, and the engine should load down, and you should have normal pressure from the wand. After you release the trigger and press it again, you will probably again have no pressure, and the engine will not load down. Removing the nozzle tip, pressing & releasing the trigger, and re-installing the tip should give you normal pressure again, but releasing the trigger will cause no pressure until you again remove the tip, press the trigger, and re-install the tip.

This is caused by a bad UNLOADER VALVE, which is located under a black cap with a metal button on it located on the top front of the pump. I don't know if you can purchase the replaceable parts from a Karcher repair shop, but when a neighbor & I took his washer to a repair place, it looked pretty simple to do this repair, and he was charged about $60 to replace a $5 (maybe) part, and it took about 5 minutes.

To determine if your problem is due to an easily replaceable part, follow these steps:

1. Connect the water supply hose, the pressure hose, and the wand WITHOUT any nozzle tip.

2. Turn on the water supply, and press the trigger until water is smoothly running out of the nozzle
after any air is all purged out. Release the nozzle trigger.

3. Start the engine, and let it warm up for about 30 seconds.

4. With the engine running smoothly, press the nozzle trigger. The water should flow out of the nozzle (without the tip installed) at a faster rate, while the engine noticeably loads down as it used to do before your "no pressure" problem. If it does not load down, turn it OFF, and disconnect everything, and contact a Karcher repair facility.

5. If the engine does load down, release the trigger, and install one of the nozzle tips (not the black one).

6. Press the trigger, and the engine should load down, and you should have normal pressure from the wand. After you release the trigger and press it again, you will probably again have no pressure, and the engine will not load down. Removing the nozzle tip, pressing & releasing the trigger, and re-installing the tip should give you normal pressure again, but releasing the trigger will cause no pressure until you again remove the tip, press the trigger, and re-install the tip.

This is caused by a bad UNLOADER VALVE, which is located under a black cap with a metal button on it located on the top front of the pump. I don't know if you can purchase the replaceable parts from a Karcher repair shop, but when a neighbor & I took his washer to a repair place, it looked pretty simple to do this repair, and he was charged about $60 to replace about a $5 (maybe) part, and it took about 5 minutes.

When you press the trigger an angled piece on the end of the plastic rod attached to the trigger pushes valve button in that then releases fluid. On releasing the trigger, the valve button is supposed to be pushed back out by an internal spring. The button gets sticky with evaporated cleaning fluid and does not come back out, causing fluid to continuously run. Try taking the machine outside, fill the tank with very hot water, pull the trigger, and let the clean, hot water flow through the valve. Perhaps it will free up. If not, the valvle will have to be replace. Either way, once it is working, ALWAYS flush the entire system with hot, clean, clear water to remove any cleaning solution in the system or it will only clog again