What is the purpose of a Fuel Pressure Regulator?
The Fuel Pressure Regulator is a must have item for any EFI system, without it, the fuel rail will not be able to build up enough pressure to support the injectors with the sufficient amount of fuel, the fuel will instead flow straight through and not reach the injectors.
On the other hand, blocking the pass-through to the fuel tank off completely, the fuel pump will try to force too much fuel into the injectors which will cause them to fail.
To accommodate for a successful fuel and air mixture, a proper fuel pressure is required in all situations, both at low revs and high revs, regardless of the power output. This is where the fuel pressure regulator is doing its job, to adapt the fuel supply to the fuel demand.
What is a Fuel Pressure Regulator and how does it work?
A fuel pressure regulator is used to maintain steady fuel supply, even during dramatic changes in fuel demand. The fuel injector has two sides, one side of the injector is under pressure from the the fuel rail and the other side is air boosted by a turbo or a compressor. Ideal ratio is a 1:1 ratio. The fuel pressure regulator regulates the fuel pressure against the air pressure/boost, this leads to that the fuel injector can maintain the perfect ratio between fuel and boost.
The fuel pressure regulator consist of a diaphragm that controls the bypass valve “ball seat” and as the picture below illustrates it can open and close in order to adjust itself for a steady fuel delivery.
When pressure (boost) is applied to the top of the regulator, the diaphragm, which is attached to the bypass valve, a spring forces the diaphragm down and reduces the amount of excess fuel, this makes the fuel pumps work harder while the fuel pressure increases linearly towards the increasing boost pressure from the intake manifold.
Calculate Your Correct Flow Rate Here:
DW Regulators Provide the Quality, Precision, and Reliability that Your High-Performance Fuel System Requires to Deliver Stable AFR and Optimum Performance.
Adjustable fuel pressure regulators are simple mechanical devices that have not changed much over the decades and are often taken for granted. However, if you have ever experienced a failed diaphragm, fluctuating fuel pressure, or hot/cold start issues that inferior regulators can cause, you will appreciate the DWR1000 and DWR2000 adjustable fuel pressure regulators. Development of the DW regulators started with a comprehensive evaluation of the popular regulators already on the market. DW regulators were benchmarked against 5 of the leading regulators on the market and designed to outperform all across multiple categories.
Designed with Ethanol in Mind
DW regulators were designed to be 100% compatible with ethanol-based fuels. The corrosive nature of modern ethanol containing fuels will create significant issues for regulators that are not designed specifically for use in this environment. DW regulators utilize stainless hardware, nitrile-fiber diaphragms, anodized housings, and are of-course 100% brass free in their construction.
Precision Pressure Adjustment
DW regulators incorporate several design features that allow precision pressure adjustment ranging from 30-100 PSI. The ball-bearing adjustment mechanism combined with a 2 psi-per-turn pressure ratio makes dialing in your desired target pressure an easy task. In addition, the massive 45mm diaphragm maintains that set pressure with unrivaled accurately.
DWR1000 and DWR2000 Meet all Your Fueling Needs
DW offers their adjustable fuel pressure regulator in 2 different sizes. The DWR1000 is designed for 300-1000hp and features -6 ORB inlets and outlets. The DWR2000 is designed for 750-2000hp and features -10 ORB inlets and -8 ORB outlet. Both regulators feature a multi-positional mounting bracket, integrated 1/8” NPT gauge port, and semi-compact 60mm footprint for maximum installation flexibility. A 0-100psi pressure gauge is also available.
Tech Sheet (Dual -6AN inlet/-6AN outlet):
Tech Sheet (Dual -10AN inlet/-8AN outlet):