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Fuel rails / regulators
- Porsche 924S 2.5L 1988
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
Adjustable direct-mount fuel pressure regulator by Adapt Motorsport. It attaches to the factory fuel rail and provides a 2.0–5.0 bar adjustment range with an M14 threaded return outlet.
Fits
- Porsche 944 naturally aspirated 1988 with M44.02 or M44.04 engine, replacing 94411019805 when set to 2.5 bar
- Porsche 944 Turbo 1988–92 with M44.52 engine, replacing 94411019805 when set to 2.5 bar
- Porsche 944 naturally aspirated 1988–89, 944 S2 1989–92 and 968 1992–94 with M44.11, M44.12, M44.41 or M44.43/44 engines, replacing 944 110 198 06 when set to 3.8 bar
This regulator is intended only for installations using the threaded lower return connection. It is not suitable for vehicles fitted with the 5/16" hose-barb connection at the bottom of the regulator.
Check fitment for your specific vehicle (model, year, engine) before ordering. Previous repairs may have introduced a different regulator or hose arrangement, so compare the installed connection with this M14 version.
What This Product Does
The regulator controls fuel pressure within the injection system. Its adjustable mechanism allows pressure to be configured for the relevant standard application or for a compatible tuned installation requiring a different setting.
Functions
- Attaches directly to the original fuel rail through an O-ring connection
- Provides adjustable pressure between 2.0 and 5.0 bar
- Connects to the fuel return line through an M14 threaded fitting
- Permits pressure adjustment for compatible Porsche 944 Turbo tuning configurations
- Replaces specified Porsche and Bosch fixed-pressure regulators
Technical Details
- Pressure adjustment range: 2.0–5.0 bar
- Fuel return connection: M14 threaded outlet fitting
- Fuel-rail connection: direct O-ring mounting
- Kit includes the regulator body, adjustable regulator, M14 outlet fitting, cap screws and lock washers
- Tested by Adapt Motorsport with Bosch 044 fuel pumps; the maximum supported flow rate has not been established
- Supplied without a preset pressure setting
Symptoms of Fault
- Fuel leaking from the original regulator
- Engine running problems associated with incorrect or unstable fuel pressure
- Difficulty obtaining the required pressure during tuning or diagnosis
Why Replacement Matters
Many original regulators are now affected by age-related leakage or failure. This adjustable unit renews the pressure-control component while retaining direct fitment to the applicable factory rail. After installation, pressure must be measured and set on the vehicle to the specification required by its engine and fuel system.
OE Reference
- Porsche 944 110 198 05
- Porsche 944 110 198 06
- Bosch 0 280 160 286
- Bosch 0 280 160 287
FAQs
- Is the regulator supplied pre-set?
No. It must be adjusted after installation using an appropriate fuel-pressure gauge and fittings for the factory rail. - Can it be used with a Bosch 044 fuel pump?
Adapt Motorsport has tested it with Bosch 044 pumps, but the upper flow limit has not been determined. - Will it fit a hose-barb return connection?
No. This version uses an M14 threaded outlet and is not suitable for the regulator arrangement with a 5/16" lower barb. - Should the installed regulator be checked before ordering?
Yes. Earlier repairs may have changed the regulator, hoses or connection type from the original vehicle specification.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
AMS9050104
The product you are viewing cross references to these numbers
Porsche Fuel Pressure Regulators - Precision Fuel Delivery Control
Fuel Pressure Regulators control and stabilise fuel pressure within the injection system, ensuring the correct amount of fuel is delivered to the engine under all operating conditions. Accurate fuel pressure is critical for combustion efficiency, throttle response, and engine safety—particularly in tuned or high-performance Porsche engines.
Available from Design911, Porsche fuel regulators include OEM replacements and performance upgrades designed to maintain consistent fuel pressure, support increased fuel demand, and improve reliability in performance-driven applications.
What Do Fuel Regulators Do?
Fuel regulators maintain controlled and consistent fuel pressure across the fuel system.
Core Functions:
- Regulate fuel pressure to injectors.
- Ensure consistent fuel delivery under varying load.
- Protect injectors and fuel pump from pressure spikes.
- Support accurate air-fuel ratios.
- Maintain stable engine performance and efficiency.
Precise fuel pressure is essential for reliable engine operation.
Why Do Fuel Regulators Fail?
Over time, fuel pressure regulators can degrade due to heat,
contamination, and mechanical wear. Common failure causes include:
- Diaphragm fatigue or rupture.
- Internal spring wear affecting pressure control.
- Fuel contamination causing blockage or sticking.
- Heat exposure in engine bay environments.
- Increased fuel demand from tuned engines exceeding stock capacity.
Failing regulators can lead to poor performance, fuel starvation, rich running, or engine damage.
Why Upgrade to a Performance Fuel Regulator?
Performance fuel regulators are engineered to handle higher fuel demands with greater precision.
Upgrade Benefits:
- More accurate and stable fuel pressure control.
- Improved support for tuned or modified engines.
- Enhanced reliability under high load and RPM.
- Compatibility with upgraded injectors and fuel pumps.
- Essential for safe performance tuning and engine builds.
Upgrading ensures the fuel system can meet increased performance demands safely.
Highlights
- Porsche fuel pressure regulator upgrades
- Precision fuel delivery and pressure control
- Designed for tuned and high-performance engines
- Improved reliability under high load
- Ideal for performance builds and rebuilds
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