Which spark plug should i use for my coleman powermate 2750 pressure washer?

Coleman Powermate Pressure Washer Model PW0902200 Replacement parts repair...
Coleman Powermate pressure washer replacement parts repair kits and pumps

any wands will work

the pressure release valve in the pump is stuck

All i can say is its not a good mechine I owen and repair washers and pumps and use them in line of business thats all i can tell you sorry

Try to replace the spark plug. It may work.

Simple answer: http://www.powermate.com/pdfs/2007/11/30/manual_pw0872401_pw0872500_pw0872700.pdf

That is your manual.

It sounds like your pressure regulator or back flow preventer is stuck closed either by corrosion or trash . Try tapping it and see it will open. If this does not work you can try rebuilding or replacing it.

Did you try a new spark plug. Old one may have fouled.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Here is a link where you can look up your exact model and replacement parts from coleman...
http://www.ppe-pressure-washer-parts.com/coleman-powermate-pressure-washer-parts

Looks like your model may be out of production though so here's a generic kit that will 99% work with your washer...
http://www.silverbin.com/FAIP-PowerWasher-Universal-Pressure-Washer-Gutter/A/B000EEQ9KM.htm

Hope that helps...

squash it