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Here is some part number info for the injection metering pumps for the Lister-Petter LPW2 & LPW4 (aka Cummins Onan DN2M & DN4M):
Lister-Petter Part#
OEM
OEM Part#
751-41173
Stanadyne
PF70/31466
751-41174A
Delphi
TPF1Q070T3502
Here's a picture of the guts of the Stanadyne version:
There are at least 2 different manufacturers that make these metering pumps with similar but slightly different designs.
Do both of yours have the same part # stamped on them? I can't quite tell from the pictures.