I have a porter cable 4000 psi 4gpm...what is the max hot water temp I can use...pump is AR RKV4g40

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The pressure relief valve could be stuck open or faulty. The check valves may be stuck or plugged up. Try thoroughly clean these parts and see if that helps.
Bob

1. The regulated pressure is at the output of the pressure regulator i/e the air pressure being delivered to the air tool or spray gun.
   
2. This can be set from just a few PSI up to about 180 PSI (on my Porter Cable unit).
   

The maximum pressure on most small compressors is 10 bar or 1000kpa which is about 145 psi in the old language most safety valves are set to 150 psi. I suggest you get some one to reduce the pressure switch setting. Running a compressor at elevated pressures does not give you any more air. A reasonable pressure for small compressors is 120 psi

The manufacturers do not recommend more than 120deg inlet temp. Overheating is a comon and serious problem for these high RPM direct drive pumps. Heat builds whenever the trigger gun is not pulled. Some pumps have special "hot pack" kits available, but even that maxs out at 160deg. Most real washers made for hot water, heat the water after the pump, not before. Special separate Hot Boxes are available for 2k or so.

I have seen the hoses develop a leak right where they exit the metal tube from the pump. The bad part is that you have to pull the pump apart to repair it. Here is a diagram so you can see what you have.

Porter Cable C2002 diagram

The compressor has a max psi setting of 150.If the pressure is not reaching this or is only stabilizing at a low pressure you have an air leak around a gasket somewhere.If it is reaching 150psi and not shutting off your pressure switch is bad.Replace it.Check your owner's manual for a part number or go to www.factoryauthorizedoutlet.com to find the part.

Could be a ruptured diaphragm, losing pressure.

check for a broken driver blade, also make sure of the proper nail guage for the tool. Let me know if this is not the case and I will find you a breakdown for the tool for further inspection.

pull the line and make sure your regulator is not plunged or the regulator is not rusted up and plugging