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I used a digital volt meter to determine which hole of the plug was positive or negative. Yes, I did use a bullet connector and simply inserted it into the original plug.

I took a look at it today. It looks like my pump is 1/4” npt (Male). I used an adaptor on each end, that goes to compression fitting. I cut the original copper fuel line and inserted the whole pump and adaptor assembly into the section I cut out. It’s still working perfectly.

Someone recently asked for a few pics of my pump installed. Here are a couple pics.

I just cut a section out of my original line and installed the pump with NPT/compression fittings.

A short pre-made brake line will thread right in to that fitting.

Update, I found that my FDC was malfunctioning and it was restricting my fuel rate too much. I bypassed my fdc and my truck now runs 100% at full load and full RPMs. The airtex pump seems to be performing fine now. I still have concerns about the lower flow rate as the fuel flow does...

I googled the company, then I called and spoke with an design engineer. I ordered my pump through my local Carquest parts store.

fwiw, Airtex manufactures almost all of the brand named pumps you will buy.(Except Facet) The in-tank pump flows about 3 times the volume that the engine needs at full load. As I said, this particular truck ran like poo without a functioning in-tank pump(a sign of something else weak). But...

I have one I put on a truck a few months ago. It does not seem to be enough. This truck did not run well without the intank pump(to begin with). I used an Airtex E8135. It does supply more fuel and pressure than the engine requires(can burn) but, it is still way under the flow rate of a stock...