This highly innovative pressure regulator (converter) from Malpassi is the ultimate plug-and-play solution when converting a previously electronic fuel-injected (EFI) vehicle or modern engine swap to run on traditional, low-pressure carburetors. It is internally engineered specifically to accept massively high injection fuel pressures—up to 6.0 bar—and regulate it down to a rock-solid, manually adjustable carburetor pressure ranging securely between 0.1 and 0.5 bar.

To safely handle this massive pressure drop without overheating the pump, the unit operates as a bypass (return-style) regulator. This means the internal diaphragm and spring assembly constantly bleed off the excess fuel volume and high pressure, returning it safely to the fuel tank. Furthermore, the regulator features a convenient, vintage-style glass bowl and a built-in, replaceable paper filter element to protect your delicate carburetor jets and needle valves from debris.

Technical specifications:

• Connections: 8 mm hose barbs across the board (Inlet, Outlet, and Return)
• Pressure Range: Reduces approx. 6.0 bar down to an adjustable 0.1 - 0.5 bar (manual adjustment required upon installation)
• Filtration: Built-in replaceable fuel filter housed within a screw-off glass bowl
• Internal setup: Utilizes 1x heavy-duty regulating diaphragm

Crucial installation note: You must plumb an unrestrictive, dedicated fuel return line from the regulator's bypass port back to the fuel tank. If the return line is plugged, not connected, or becomes kinked, the regulator will completely fail to reduce the pressure. The resulting deadhead pressure will immediately flood your carburetors and will rapidly destroy your high-pressure electric fuel injection pump. Please also note that this specific unit does not feature a dedicated threaded port to mount a fuel pressure gauge directly into the body casting.