The mechanical pump diaphragm has a pressured fuel side and an air side, with a small hole at the bottom of the pump housing. When it leaks you can see a small stream of fuel out of the hole, most of it however goes in the block.
It is also possible that a stuck inlet valve on the carb or float issues can have fuel streaming into the manifold, washing down the bores into the oil.
Either way it is not healthy.
Alternatvely it could just be bec ause you have started it many times on full choke and you are smelling left over fuel in the cylinders. In any case that oil will be toast.
Changing the mechanical pump is 5 minutes work with a spanner. When you put the new one you either force it in or insert the bolts a little and then tighten it down. the spring in the pump will fight you on the way in.
BagusJeep lives in Bali.
1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE