The background. 5 gallon cell with sump. -12 to 275 Weldon pump and -10 up to a aeromotive dead head regulator. -8 to 2 old Carter carbs with .125 seats. Pump has a -8 bypass to the tank with a -6 vent. Pump set at 20 psi. Regulator set at 5 psi. During a run, the pressure drops to 4 psi but doesn’t recover on the return road. On the return road if I stab the gas or stab the brake the pressure will vary a half a pound. It isn’t till I get back to my pit that it makes it back to 5 psi and stabilizes.