Started logging fuel pressure

The way I like to do the flow test is………
(Easiest with a helper)
Disconnect line from carb, and attach a hose that can reach over the fender or grill to a can.
Attach a ball valve at the can end, with a gauge just before the valve.
Prior do doing the actual timed test, with the pump running and the hose off the valve going into a container, adjust the valve to set the pressure at the valve to your preferred minimum(4-5psi).
Shut the pump off, don’t touch the valve.

(I like to use a metal one gallon can for the timed test.)

Time how long it takes to fill the one gallon can while maintaining the desired minimum pressure.

Then calculate how much hp that fuel flow will support at a bsfc of .5
Example: For a 475hp engine the system needs to pump .66 gallons in a minute…….. which if I’ve done the math right is a gallon in 90 seconds.

I have seen several cars fail that test miserably.