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Mine has been working fine with the smaller aux pump running as the primary. I just needed the right fittings.

The proper fittings to use an auxiliary fuel pump as the main fuel pump are as follows. 1/8" NPT x 1/4" JIC I ordered several fittings, tested them out last night and they fit the pump and hose connections. Now I can use the 3 aux pumps I have for either application.

There are also mechanical fuel pumps available for the LPW series engines. Any thoughts on those?

It might work. I bought a Spectra radiator some years ago and it is still running strong, so I am familiar with the brand and quality. The price is right, too. I'm half tempted to just swap out these AN fittings with hose barbs to make it easier to work on. AN fittings are expensive and not easy...

This is what I received. https://www.amazon.com/FACET-SOLID-5-6-5PSI-CARBURETED-ENGINES/dp/B013SGG7GI

Facet 41116 NSN 2910-01-378-6025 According to the fleabay ad. I will check the number on the unit when I get home tonight.

So, I have bought 3 fuel pumps and despite the listing's part numbers or pictures, all 3 of them are auxiliary fuel pumps; not primary pumps. I need the primary pump replaced. The big difference is the input and output fitting sizes. I don't know exactly what they are but the original pump seems...