This is a terrific all around regulator. Suitable for one dual inlet carb or two single inlet carbs. Suitable for up to 650 hp. For higher hp, use two regulators.

Same use as 2-port but also has a return line. For converting an EFI vehicle to a carburetor but using the EFI fuel pump and return line. Also, this type of regulator should be used in conjunction with a high volume electric pump to avoid overworking the pump and heating up the fuel. At idle or low engine speeds, a high volume pump is attempting to pump way more fuel than the engine can use. With a bypass regulator, all this excess fuel is returned to the tank.

Suitable for two dual inlet carbs on engines up to 1,200 hp. Note that HP rating relates to number of carb inlets. O-ring fittings included with regulator. Wrench flats on outlet ports make it easy to install fittings.

Suitable for two dual inlet carbs on engines up to ,200 hp. Note that HP rating relates to number of carb inlets. This is one of the best buys in regulators.

Same use as 4-port but also has a return line. For converting an EFI vehicle to a carburetor but using the EFI fuel pump and return line. Also, this type of regulator should be used in conjunction with any high volume electric pump to avoid overworking the pump and heating up the fuel. At idle or low engine speeds, a high volume pump is attempting to pump way more fuel than the engine can use. With a bypass regulator, all this excess fuel is returned to the tank. A 5-port bypass regulator would commonly be used where dual inlet dual four barrel carbs are used and the four carb inlets can be plumbed directly from the regulator.

This is the ultimate in a compact, affordable fuel pressure regulator. Features billet aluminum construction, stainless mounting bracket, and stainless hardware. Compare to a Holley® 12-803 or similar regulator. Suitable for engines up to 450 hp. Use two units for higher hp applications with dual carburetors.

(1) 3/8-NPT Inlet Port (2) 3/8-NPT Outlet Ports .220 (7/16") Restriction

10665 Brushed Black Anodized and Aluminum Finish

Note this regulator is designed to use o-ring style fittings on the inlet and outlet ports. It is supplied with (3) o-rings for use on port fittings. Note that the port threads are the same as -06AN fittings. For example, you can use a Professional Products -06AN Flare Union fitting in these ports. #15216 (blue), #16216 (black) or #17216 (polished). If you need a 90° style fitting we offer one in black only (#71285) that comes with a jam nut and o-ring. This design allows you to thread the fitting into the position you want and lock it down with the jam nut.

(3) 9/16-18 o-ring style ports - .220 Restriction

This is the ultimate in a compact, affordable fuel pressure regulator. Features billet aluminum construction, stainless mounting bracket, and stainless hardware. Compare to a Holley® 12-804 or similar regulator. Suitable for engines up to 450 hp. Use two units for higher hp applications with dual carburetors.

For return style systems where more than one feed is desired to the fuel rails. Any unused port can be blocked with a pipe plug except the return port or two ports can be used as inlets and two as outlets. Designed for use on conventional EFI systems requiring more than one feed line to fuel rails with one return line to the fuel tank. Wrench flats on outlet ports make it easy to install fittings. Adjustable from 25 psi to 75 psi.

These Regulators bolt in place of the stock units and provide fuel pressure adjustability in a range of approximately 25 to 75 PSI. Extemely easy to install.

These Regulators bolt in place of the stock units and provide fuel pressure adjustability in a range of approximately 25 to 75 PSI. Extemely easy to install.

Designed for use on regular EFI?systems requiring one feed line to the fuel rails and one return line to the fuel tank. Wrench flats on the 10686 model make it easy to install pipe fittings. Adjustable from 25 to 75 psi. Bottom port is the bypass back to the fuel tank. Two ports on sides can be either inlet or outlet. Fuel pressure will rise on a 1:1 ratio when referencing boost.

Note: The 10685 regulator is designed to use o-ring style fittings on the inlet and outlet ports. It is supplied with (3) o-rings for use on port fittings. Note that the port threads are the same as -06AN fittings. For example, you can use a Professional Products -06AN Flare Union fitting in these ports. #15216 (blue), #16216 (black) or #17216 (polished). If you need a 90° style fitting we offer one in black only (#71285) that comes with a jam nut and o-ring. This design allows you to thread the fitting into the position you want and lock it down with the jam nut.

Note: The 10686 model replaces the previously offered 10670 and 10671. The 10686 not only looks different with a new exterior finish, the functionality of the regulator has been improved.

Regulator rebuild kits include new diaphragm, springs, seals and o-rings.

10690
For regulators 10650, 10651, 10654, 10655, 10656, & 10657

10691
For regulators 10652, 10653, 10658, 10659, 10670, 10671, 10672, 10673, 10678, 10679, 10680, & 10681

10692
For regulators 10660, 10661, 10662, & 10663