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Installation Home

Fuel Pressure Regulator
with Instructional Video

The TBI kit comes with an Aeromotive gas pressure regulator and I provide an assortment of fittings that should work for most people. Additional fittings can be bought at most hardware, auto or home improvement stores. The five (5) fittings in the red body section are all 3/8" NPT while the one fitting in the black body section is 5/32" NPT.

The regulator ships from the factory with a low pressure spring. To prevent pulsing in this application it should be replaced with the stronger high pressure spring.

PLEASE REVIEW the FAQ page and the TBI Installation Check List which will answer many of the questions you may have about installation of the regulator.

There's also a video at the bottom of this page showing the running of fuel lines and installation of the regulator.

Regulator, Gauge, Fittings & Bracket

The regulator can be mounted pretty much anywhere as long as the fuel hose run from the regulator to the injector fittings does not exceed three (3) feet. It can also be mounted horizontally and even upside down as well as vertically.

There are five (5) fittings around the red body section. The ones labeled #1-#4 can be used in any order or combination for: outlet to injectors, inlet from fuel pump or Pressure Gauge. The outlet on the bottom of the red body section CAN ONLY be used for the return line to the gas tank. The small fitting in the black body section is used as an emergency overflow fitting.

Here's another view showing some of the fittings and the pressure gauge installed.

 

The gauge is liquid filled so it must be mounted with the little rubber plug at the top to allow for expansion and contraction of the liquid with temperature. The rubber plug needs to be pierced with a pin making a tiny vent hole. Mounting instructions are on the gauge itself or in the box.

Once you get the regulator installed and all the hoses connected, you should loosen the pressure adjustment fully by turning it CCW.  The fuel pressure regulator adjustment screw should be backed off before pressurizing so the pressure can be brought up to the target amount. Over pressure will instantly destroy the 0-30 psi gauge. Pressure setting differs depending upon the make and model car but if that is unknown 11.psi is a reasonable starting point. Components are tested up to 25psi- do not exceed that limit without contacting Patton Machine or Affordable Fuel Injection.

An excellent video showing the location and installation of various engine bay components.

NOTE: Since posting these videos we've determined that the regulator must be mounted with the little rubber plug at the top to allow for expansion and contraction of the liquid with temperature. The rubber plug needs to be pierced with a pin making a tiny vent hole

Early TR6, TR250, etc. MAP port- On these early engines you may need to add a small port so that the MAP sensor can be isolated from any other intake vacuum source. A small 1/8” NPT pipe thread hose barb can be added to one of the intake runners by drilling and tapping. Contact me if you have questions.

Ignition Module location- The ignition module is mounted on an aluminum heat sink designed to mount behind the ignition coil with the coil bracket mounting bolts. It is best to have the module mounted to the block rather than a body part where the ground connection may not be quite as good.

PCV valves and crankcase vents hoses- should not be plumbed directly into a TBI intake as they will have the same effect as a vacuum leak causing a high idle and false load readings to the MAP sensor.

Goodpart’s oil/vapor separator- If you have one of these separators, like the above PCV valves, they should not be plumbed directly into a TBI intake manifold but rather to the air cleaner or the 5/16” side ports on ZS carbs.  

An under-hood tour of the various components installed in this 1975 TR6

 

NOTE: Since posting these videos we've determined that the regulator must be mounted with the little rubber plug at the top to allow for expansion and contraction of the liquid with temperature. The rubber plug needs to be pierced with a pin making a tiny vent hole

Installation of the regulator (preferred location and new style regulator),
fuel lines and the fuel pump.

 

 

Patton Machine LLC - Custom Components for Classic Cars