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I have the SD pump that came with my eFuel kit. So quiet I can't hear it running even outside my truck with the truck off, and have not seen fuel budge off of 64psi except when I had a clogged filter. Currently running stage 1 (160/0) Rosewoods, stock turbo, and Swamps tunes on a Hydra. I pulled a trailer with a pretty big load from Texas to ND through Nebraska and Oklahoma, so no elevation to speak of, but I wasn't going easy on the old girl either and I never saw a dip in fuel pressure.
Okay so your truck is set up like mine. I have a fuel lab regulator, do you remember what the threads are on your regulator? Or what guage do you have? Thanks!
Note: NPT needs sealant for a leak free connection. It is recommended to use liquid sealant to prevent oversizing the male side and cracking what you're screwing into... I found out the hard way that too much tape will cause issues.