Super hot here in the 110 area yesterday the pump just stopped running hit the high pressure reset ran about 15-20 min did it again once it cooled off in the evening no problems till today when it got really hot

new pump --not big enough for the job
old pump --motor windings problem, faulty start run capacitor
I suspect that as the motor is 1/2 hp if will run good when there is a need for water but under pressure the pressure switch is set to high so the motor overloads and gets hot

diesel engines high pressure pumps not suppose run dry.diesel fuel keep high pressure pump cool and lubricated.problem could be fuel pressure regulator in the fuel filter water separator housing.replace fuel filter see if it helps problem could be fuel pressure regulator in fuel filter housing, the fuel pressure regulator has a air bleed orifice that allows vent to the fuel tank.make sure fuel pump fuse okay pump getting power. i would let garage or dealership check it out if all fails because your diesel engine fuel timing is pcm controlled if let fuel system go dry you probably have to have fuel injection timing reset or could have damage high pressure pump letting it run dry i hope thats not the case because high pressure pump not cheap part i hope it not that.

I assume you put fuel in the tank. This car uses a small high pressure fuel pump to pump gas to the engine, this pump is located inside the fuel tank, the tiny pump depends on the gas it sits in for cooling and for lubrication, if you run out of gas you quickly damage the pump, in fact any time you run below 1/8 tank you cause it to run hot, so you might get away with running out of gas once or twice by you always run the risk of the pump freezing up from lack of lubrication and cooling when you run out of gas, which is what you have likely done.

at home depot the sell a pen that beeps at the sight of voltage (sensor) 12$ good house hold tool to have.. check the cord running to pump see if the pen beeps when held against cord if its a 110 set up the pen beeps and youve the 110 V needed to run the pump if 220 V a bit different .. if left powered But not running in a few min, touch motor housing the metal part of this unit. is it hot as a grill (internal winding problem) or still cool .. Motors are a wear item like tires on ones car.. motors are inexp like 110$ for a 1 hp unit

Hi, what this reset is for is high head pressure. Its building up high pressure and going off releasing this pressure and tripping the switch. I'm not sure if this is water cooled or has a fan in the back for air cooled. If you can get to the back coil, condenser coil and give it a good washing out with a garden hose to clean it, this will solve your problem if its air cooled only though. Try this to see if it does. If not let me know and we can go from there.
Sincerely,
Shastalaker7

last year my aura classic 110 has same problem like your at first i thought that my coil is busted due to the symtoms that the engine died after a minute of running then runs again after it cools down, when i test the coil the coil if fine so we decided to open the motor and there we saw that the oil pump is brocken, the oil didnt get high enough and make my engine overheated making my engine stop, i know that we are talking at diffrent kind of bike i just giving my point of view and i hope it help

sound like high pressure switch going out,,, if you replace it ,, you have to replace the gas,, but will cause it to cut off when high pressure hits,, and work again when cooled off

Has Neon do same, I ran fuel at low level, on hot day, ran engine until it started to act up & threw a fuel pressure gauge on it. Was at approx 5 psi. Cold next morning, 48-50 psi. Always hot day about 30-40 miles into work in morning, o.k. Sit in hot sun all day & would happen 3-4 times on way home. Sit and let cool, 20 minutes or so & go again for a while. Cool day, no problem. Change pump I would.

Capacitor, dirty condencer coil causing the motor amps to run too high. But most likely worn bearing on blade side of motor causing it to pull to one side causing it to over heat and shut down. Sleve bearings should have no side play.

If running in heat check indoor air filter if in cool wash out outside coil with garden hose make sure fan is not overheating and shutting down.