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AEM Adjustable Fuel Pressure Regulators
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The AEM Universal Adjustable Fuel Pressure Regulator includes many of the features found in our application-specific regulator and can be remotely mounted on ANY application that utilizes a return hose. This unit is capable of supporting enough fuel flow for engines in excess of 1000 horsepower.

Key Features:
  • CNC-machined from 6061-T6 billet aluminum
  • Patented interchangeable discharge ports match regulator output to output of any fuel pump
  • Adjustable from 20 psi to maximum fuel pump capacity
  • Remote mounting bracket and comprehensive installation instructions included
  • Manufactured and assembled in the USA
  • Patent # 6,298,828

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  • Q:  Where should I pick up fuel for my wet nitrous system?
    A:  Assuming there is adequate fuel delivery (see “When do I need to upgrade my fuel system?”) the easiest and best place to pick up the fuel is from the fuel rail. If an AEM Fuel Rail is used, there is a 1/8th NPT port on the top of the rail for a nitrous pick up or fuel pressure pick up.
    Q:  What pressure do AEM’s Adjustable Fuel Pressure Regulators come set to?
    A:  The AEM fuel pressure regulators supplied for Honda cars are pre-set to 40 PSI. The universal regulators are NOT preset. The fuel pressure used depends on the needs of the vehicle. To a limit, the pressure can be increased to compensate for inadequate fuel delivery. The point where this is detrimental is when the fuel pressure exceeds the opening pressure of the fuel injectors and fuel delivery diminishes. This is most common when forced induction engines use too small of an injector. For information on how to properly set up your fuel delivery system, please refer to the “When do I need to upgrade my fuel system?” FAQ.
    Q:  What pressure is the Adjustable Fuel Pressure Regulator capable of withstanding?
    A:  Under normal use the diaphragms in our Adjustable Fuel Pressure Regulators can withstand 120 PSI. The test standard for the diaphragms is to withstand 120 PSI of pressure for minimum of 1 minute of continuous pressure.
    Q:  I have a “dry” nitrous system. Can this hurt my fuel pressure regulator?
    A:  Some nitrous oxide systems apply direct nitrous bottle pressure to the top of the regulator diaphragm and may cause it to delaminate. The diaphragm is NOT capable of withstanding repeated nitrous pressure in this instance and is not intended for this use.
    Q:  What type of fuels are AEM fuel delivery components compatible with?
    A:  Our fuel delivery components can be used with gasoline, methanol or ethanol
    Q:  Why don't you make fuel delivery components for my car?
    A:  In some cases there is simply not enough demand to warrant the R&D and manufacturing cost to develop fuel delivery components for a specific application. In other cases (mostly newer vehicles) the vehicle manufacturer integrates the fuel pressure regulator and fuel filter into the fuel tank, making it cost prohibitive for us design components for that configuration. In the case of the latter, if you elect to create a return-style fuel system our fuel filter and universal adjustable fuel pressure regulator can be used for a custom application.
    Q:  When should I change the AEM Fuel Pressure Regulator orifice?
    A:  AEM’s Adjustable Fuel Pressure Regulators feature patented interchangeable discharge ports. This allows the user to tailor the regulator return volume to match their fuel pump. A common problem that occurs when using a fixed port common on most “universal” regulators is that fuel pressure cannot be effectively controlled when the fuel pump volume is different than stock. In the case of too small of a discharge port, there is a large pressure spike associated with rapid deceleration because the orifice of the port cannot flow enough fuel when the diaphragm is fully deflected to the open position. This causes a momentary rich condition, which may lead to a rough idle quality until the pressure stabilizes. Conversely, if the discharge port orifice is too large the adjustment is difficult because the response of the fuel flow out of the orifice is too rapid, which makes the adjustment screw too sensitive. AEM Adjustable Fuel Pressure Regulators include three sizes of discharge port orifice, .100”, .150” and .200”. You can change the port by removing the diaphragm and unscrewing the installed port, and replacing it with a port with the desired size orifice. The size range provided with the kit is enough to cover any pump from a stock Honda pump to the largest pump available.
    Q:  Are AEM High Volume Fuel Pressure Regulators emissions legal?
    A:  No. Due to the adjustability of the regulator, AEM Adjustable Fuel Pressure Regulators cannot be granted an E.O. for 50- state legality and are intended for use on off road vehicles only.
    Q:  What are the thread sizes of the AEM Fuel Rail and Fuel Pressure Regulator ports?
    A:  The port thread sizes are 9/16x18, or standard –6 AN fittings. We also include a 1/8th NPT port in the front of our universal regulator (part number 25-302) and on the top of our fuel rails for a fuel pressure gauge or gauge pickup.
    Q:  Can I use Teflon tape on the fuel deliver component fittings?
    A:  Using Teflon tape is not recommended as it can cause clogs which can damage your fuel system or engine and void the warranty on your AEM High Volume Fuel Delivery component. We include crush washers with our fittings to eliminate the use of sealing tapes or liquid thread locker.

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