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I think that 3/8" is the hose barb diameter, not the pipe thread size. The threads are probably 1/4" or 1/8" NPT like most of these type pumps I've seen. Also the Airtex E8135 is a straight through pump that will most likely result in the need to trim or remove the perforated shield above it...
Today happened to be my schedule load test day so I performed a fuel pressure and volume test on the Airtex E1074 installed on my unit.
Fuel test
08/13/2017
Dead head pressure was 6 PSI
Volume was ¼ gal in 60 seconds = 32 ounces per min = 15 GPH
Finally located the test procedure in the TM. Seems they called it a transfer pump in that manual instead of primary fuel pump. It doesn't give a pressure specification but says it should have a minimum flow of 25 ounces in 1 minute. that equates to 11.7 GPH.
My genset doesn't have any problems...
The parts manual shows both fittings are pipe to tube and the Spectra pump indicates the fittings are 3/8 so I bet it's got 3/8 NPT threads for hose barbs. The stock fittings may screw right into it. I found the pump listed at Autozone as well as online so if you have an Autozone local you could...