fuel pressure questions.

[Ramsey]

Pump, filter, one way flow check valve, into one fuel rail, crossover to other rail, exit rails to fuel pressure regulater, return excess fuel/pressure to tank.

so red ,im losing prime ,i call it .by putting the check valve were uu described i wont lose prime through the regulator return?im pretty sure the reg will hold xx psi without relieving it .but want to be sure . i know thats y its called a regulator but nothing suprises me.