I'm not certain which one you mean, but I believe 18-7326 (the one described as "low pressure") is actually a 7 psi pump, not 2.5. "low pressure" is relative.I have a 1997 chris craft boat that has a carburator, and it has a carter electric fuel pump like the one in the link below, It is very quiet, low pressure, and I thought about putting one in my TR6 to replace the noisy electic one I have now, its a little pricy but its for a boat so go figure. it should be explosion proof too!
https://www.iboats.com/OMC-Sterndri...3616303--session_id.416330952--view_id.269077