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Fuel Accumulator
By OE Match
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Replacement fuel accumulator designed to maintain fuel pressure and system integrity on Porsche 911-series engines fitted with CIS / K-Jetronic mechanical fuel injection (e.g., 911 SC, 930 Turbo). Its function is to store pressurized fuel when the engine is running and maintain that pressure when the engine is turned off - ensuring immediate, stable fuel delivery on next start, and preventing vapor lock issues.
Fits:
Porsche 911 SC 1980 -1983
Porsche 930 Turbo 3.0L 1975 - 1976
Porsche 930 Turbo 3.3L 1978 - 1989
Porsche 964 Turbo 3.3L/3.6L 1989 - 1994
Diagram ref no 6.
• With age and repeated pressure cycles, the internal diaphragm can fail or weaken, leading to loss of fuel pressure and possible fuel leaks.
• A failed accumulator means loss of residual pressure - leading to difficult or prolonged cold/hot starts, fuel-starvation, or hesitation under throttle - especially problematic on mechanical injection or turbo models.
• Ensuring a healthy accumulator helps preserve injector life, prevents vapor locking, and ensures reliable performance and drivability - particularly important for classic cars where fuel-system integrity is fragile.
When to replace (common scenarios)
• If the original accumulator shows visible damage, leaks, or drips around the housing or fittings
• When experiencing hard or slow hot starts, hesitation, or fuel-starvation symptoms.
• If the car has been standing for long periods - to avoid internal fuel degradation or diaphragm failure.
• During a fuel-system overhaul, restoration, or maintenance of older Porsche 911 / 930 CIS injection systems
• As preventive maintenance on high-mileage engines to maintain fuel pressure stability and reliability
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91111019734
The product you are viewing cross references to these numbers
OEMatch Fuel Accumulator — Fit, Function, Confidence
A fuel accumulator helps stabilise fuel pressure between the pump and injectors to support smooth running and reliable starting on Porsche models. It is especially important on K‑Jetronic/CIS and MFI systems where steady residual pressure prevents hesitation, improves cold and warm starts and reduces load on the pump.
Understanding OEMatch Fuel Accumulator
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original fuel accumulator.
OE (Original Equipment) refers to parts matching original specifications for the fuel accumulator and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM fuel accumulator engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
The accumulator itself stores a small volume of fuel under pressure and releases it to maintain a constant flow when the pump output varies. This buffering reduces pressure spikes and drops that can cause hard starting, hesitation or uneven idle. Overhaul, restoration and routine maintenance often include inspection or replacement of the accumulator to restore correct residual pressure and driveability.
Available Types
- Replacement steel-housed accumulators for direct substitution
- Diaphragm and seal rebuild kits
- Pressure-stabiliser assemblies and replacement valves
Benefits Include
- Restores consistent fuel pressure to reduce starting and idling issues
- Improves throttle response by maintaining steady delivery under load
- Reduces wear on the fuel pump and injectors by limiting pressure cycling
Why Fuel Accumulator Wear and Fail
- Internal diaphragm wear or rupture, causing loss of residual pressure
- Corrosion or deterioration of the housing, compromising sealing
- Contaminants or ethanol‑blended fuels damaging seals and materials
The Importance of Replacing with OEMatch Fuel Accumulator
Replacing a worn accumulator restores the fuel system’s ability to hold residual pressure and helps avoid long cranking, rough idle or inconsistent performance on Porsche models. Selecting a replacement designed for the application helps preserve starting behaviour and throttle response, and supports reliable operation across varied temperatures and driving conditions.
Advantages
- Direct-fit units for straightforward installation and secure sealing
- Corrosion-resistant housings and durable diaphragm materials
- Suitable for classic K‑Jetronic/CIS and modern MFI-equipped Porsche engines where compatible
Support & Advice
Fitting can appear straightforward but may require procedures such as correct torque settings and careful routing of hoses. If you lack the correct tools or model-specific knowledge, we recommend professional installation. Recheck fasteners and connections after initial running and observe for any diagnostic codes or fuel odours.
