Pressure Regulator & Fuel Pump Fittings

To release factory OEM style fuel pressure fittings, a quick disconnect tool is required. This tool slides over the smaller side of the fuel pressure fitting connection, it then slips between the two fittings. With gentle force, it pushes down on a plastic quick release, which disconnects the link.

There are different types of high pressure fuel line fittings on fuel rails for pressure fittings. Aftermarket custom fuel rails typically have NPT (National Pipe Thread) fittings. Installation involves applying thread sealant on the threads and tightening the fittings to the fuel rails. Factory-type fuel rails have quick connect high pressure fittings. To install, the fitting is simply pushed onto the rail line until an audible "click" is heard is heard from the plastic lock, which completes the connection.

There are two main types of fuel pressure fittings that are installed into mechanical fuel pumps (like Holley or Edelbrock). The first type is a NPT (National Pipe Thread) fitting. This fuel pump fitting size (usually 1/4 ", 3/8 ", or 1/2 " NPT) has tapered threads that causes the fitting to tighten up the more it is threaded into a component. To install this type of fitting into a fuel pump, fuel pump fitting sealant needs applied to the male threads to prevent a fuel pump fitting leak. The fitting is then tightened snug. If the fitting needs clocked to correctly line it up with a fuel line, carefully tighten it further but avoid overtightening which will cause damage to the fitting or pump. The second type of fitting is an inverted flare fitting, which is common on OEM fuel lines. This type of fitting seals without liquid thread sealant as the inside edge of it butts up against a matting surface inside the pump, when tightened properly. Factory hard fuel lines have a sliding tube fitting that tightens the fuel line flare against the inside of the fuel pump. Lower pressure 12V electric inline and in tank fuel pumps can use barb style fittings where one side is either threaded or pressed into the pump and the other uses a rubber hose and hose clamp.

Fuel regulator fittings are installed the same way as fuel pump fittings. Most aftermarket fuel pressure regulators use NPT or AN regulator fittings. Fuel pressure regulator sizes can vary from 1/4 " NPT to 1/2 " NPT and -6 AN to -12 AN with O-ring seals. Installation of AN fuel pressure regulator fittings requires simply tightening the fitting until the O-ring makes a tight seal. NPT fittings require thread sealant to prevent leaks and then are tightened snug.

A JEGS expert is ready to answer your questions and help you find the fuel pump fittings & adapters that you require for your specific application.