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Fuel rails / regulators
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
Adjustable direct-mount fuel pressure regulator by Adapt Motorsport. It fits the factory fuel rail and provides a 2.0–5.0 bar adjustment range for application-specific pressure settings.
Fits
- Porsche 944 naturally aspirated 1982–85 with M44.02 or M44.04 engines, replacing 94411019801 when adjusted to 2.5 bar
- Porsche 944 naturally aspirated 1985/2–88 with M44.05–10 engines, replacing 94411019803 when adjusted to 2.5 bar
- Porsche 944 Turbo 1986–89 with M44.51, or M44.52 up to engine number 47K 02563, replacing 94411019803 when adjusted to 2.5 bar
- Porsche 924S 1986–88, replacing 94411019803 when adjusted to 2.5 bar
- Porsche 944 naturally aspirated 1988 with M44.40 engine, replacing 94411019804 when adjusted to 3.8 bar
- Porsche 944S with M44.11 up to engine number 46K 02979, or M44.12 up to engine number 46K 61255, 1987–88, replacing 94411019804 when adjusted to 3.8 bar
- Porsche 944 S2 applications, subject to verification of the regulator and hose arrangement already installed
Not directly
suitable for the 944 Turbo M44.52 from engine number 47K 02564 onwards when
fitted with the threaded lower connection used by regulators 944 110 198 05,
944 110 198 06, Bosch 0 280 160 286 or Bosch 0 280 160 287. Installation
requires conversion of the threaded return line to a plain hose and suitable
hose clip.
Check fitment for your specific vehicle (model, year, engine) before ordering. Regulators and hoses may have been changed during earlier repairs, so compare the connection type with the component currently fitted.
What This Product Does
The regulator controls fuel pressure within the injection system. Its adjustable design allows the required operating pressure to be set for the applicable factory system or a compatible tuned installation.
Functions
- Mounts directly to the factory fuel rail using an O-ring connection
- Provides adjustable fuel pressure from 2.0 to 5.0 bar
- Connects to the return hose through an 8 mm barb outlet
- Allows increased fuel pressure where required by a compatible 944 Turbo tuning chip
- Supports straightforward replacement of specified Bosch and Porsche regulators
Technical Details
- Adjustment range: 2.0–5.0 bar
- Fuel return connection: 8 mm hose barb
- Fuel-rail connection: direct O-ring fitting
- Supplied with regulator body, adjustable regulator, 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
- The regulator is not supplied pre-set and must be adjusted on the vehicle using a suitable fuel-pressure gauge and fuel-rail adaptor
Symptoms of Fault
- Fuel leakage around the original regulator
- Running problems caused by regulator failure
- Difficulty obtaining the required fuel pressure during engine tuning
Why Replacement Matters
Many original regulators fitted to these models are now several decades old and may leak or cease to regulate correctly. Replacement restores an adjustable pressure-control point while retaining a direct connection to the applicable factory fuel rail. Final pressure must be measured and set after installation to match the vehicle and engine specification.
OE Reference
- Porsche 944 110 198 01
- Porsche 944 110 198 03
- Porsche 944 110 198 04
- Bosch 0 280 160 214
- Bosch 0 280 160 227
- Bosch 0 280 160 263
FAQs
- Is the regulator supplied at the correct pressure?
No. It must be measured and adjusted on the vehicle after installation. - What equipment is needed for setup?
A suitable fuel-pressure gauge and fittings for connection to the factory fuel rail are required. - Can it be used with a Bosch 044 fuel pump?
Adapt Motorsport has tested the regulator with Bosch 044 pumps, although the upper fuel-flow limit has not been determined. - Will it replace every 944 Turbo regulator?
No. Later M44.52 installations with a threaded lower regulator port require modification of the return-line connection.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
AMS9050101
The product you are viewing cross references to these numbers
- 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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Engine / Gearbox Mounts
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Oil Flow / Sump
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IRIDIUM RACING Spark Plugs
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ECU Reader / Fault Finder
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Fuel Additives
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Wössner Forged Piston Kit
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Wössner Steel Connecting Rods
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CP Carrillo Connecting Rods
