Long story short relief Captain decided to put some diesel in the new paint sprayer ( one of those little electric home projects ones) to clean it.... When I was in auto body I was told it was a old school deal ...but to never do it especially with newer machines. I emptied it all out and have it circulating war soapy after right now .... What's the chance this thing might be messed up now. ?

Oil based paint you will be ok……
The stuff we did navy ships interiors in the 80s should kill ya………

If the sprayer is suitable for oil based you are good I would bet

When I worked in a body shop we cleaned with acetone

if was spraying oil based paint , cleaning with paint thinner is more better.

It should be OK as long as you get all the diesel residue out.

If spraying, oil-based paints, I usually clean with denatured alcohol or acetone. For latex paint just soapy water.

Mineral spirits is best thing

So got it cleaned out, lotta soapy water then thinner for a hour or so.and also learned...don't tell someone with a powder tripping problem that they could have damaged some equipment and expect them to stay professional