Hello how are you
You will need to determine weather the engine is locked up OR the pump is siezed.
My bet is the pump. Unbolt the engine and the rubber exhaust hose and slide the engine forward. Try to turn the pump from the coupling, if it spins the problem is the engine and vise versa.
My advice is to find an aftemarket pump assy, rather than replacing individual parts.
You could also look into the pump from the back and see if there is any gap between the impeller and the housing. The housing is aluminum and the sleeve is stainless steel, what happens is corrosion builds up between the housing and the sleeve and squeezes the impeller
If you have any further questions let me know. Please remember to click on the accept button at the end of this chat, it is the only way i am compensated for my time...Thanks
Thanks - hopefully it isn't the engine - possibly back to you after following through as you suggested.