I put the Airtex pump in a bucket with the filter on and connected a gauge via rubber hose and clamp. put fuel in the bucket and applied power to the pump. It ran up to 100 psi instantly and the built-in bypass kicked open. It gradually leaked off the pressure down to about 60 psi over 20 minutes or so. Though that would run the engine fine, I returned it to the auto parts store in town (I live on a farm) and they took it back, then ordered a Delphi unit that should be here tomorrow. Only a few bucks more... quite a bit more than the internet, but way more easy to get swapped if it gives trouble. I'll measure the Delphi pump before I put it in and post the results just FYI.