I've been looking for a small adjustable fuel pressure regulator to complement my pump. The pump had its own regulator but it had to be removed along with some other built in features.Those were meant to send fuel to the burner at a predetermined pressure. They call it " clean cut in/out" Unfortunately it meant that I could not vary the pump outlet pressure and that I would need to open a bleeder port to start the pump if it has been disconnected from its fuel supply...Inconvenient. So I was left with a quite capable pump that could probably exceed a safe working pressure for my use hence a need for an external adjustable pressure regulator.
An idea came to me that I want to share I made a regulator out of a direct acting solenoid valve body. In such a valve, fluid is fed on the inlet side of the valve body and helps to close the valve on its own pressure.But if the fluid is fed from the outlet side of the valve it will be pushing against the seal. So I removed the coil and drilled the top of the core and tap it to accept a fine pitch set screw That screw now pushes on a spring against the armature and seal.A cap plug is fitted on top of the core to seal leaks. Fuel is fed via a "tee" fitting and excess fuel is returning to the tank.