Max Richter wrote
many C119/123; B36; Neputnes and several other airplanes with
reciprocating-engines were fitted jet -engines as "boosters".
Now the question:
did they use avgas for these jets or jetfuel from a special tank ?

The Neptune "de-fuelers" burned 115/145 right along with the
R-3350s.

Bob Moore
VP-21 1959-1962