lesorubcheek
Addicted to ArboristSite
The 540 oil pump has an aluminum housing where the 8800 is some kinda hard plastic. The 540 uses a gasket where the 8800 doesn't. Can't remember for sure, but pretty sure the holes for the passages are in slightly different locations. Wish I could tell ya for sure, but best I can say is there's a chance it would work, but I'd doubt it. Have to give it less than a 50/50 chance of interchange. Sorry I can't give a definite answer... maybe someone can say for sure.
Dan
Dan