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Rubber mount for rear fuel pump. Porsche 911 1974-89 ❭ 99970338401
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
This OE Match rubber mount is a replacement vibration isolator used to secure the rear fuel pump on Porsche 911 models from 1974 to 1989. It is designed to match the original-style fitment and helps hold the fuel pump securely while reducing vibration transfer to the body.
Sold each
Fits:
Porsche 911 1974 - 1979 (2 pcs per car)
Porsche 911 Turbo 1975 - 1989 (3 pcs per car)
Diagram ref no 6
The rubber mount supports the fuel pump in its mounting position and helps absorb vibration generated by pump operation and vehicle movement. It keeps the pump correctly located, reduces noise, and helps protect the fuel pump and mounting bracket from excess stress.
Functions
• Secures the rear fuel pump to its mounting bracket
• Helps isolate fuel pump vibration from the body
• Reduces fuel pump noise and resonance
• Supports correct pump alignment and fitment
• Helps protect fuel lines and pump fittings from movement stress
• Replaces perished, cracked, loose, or missing original rubber mounts
• OE Match replacement for fuel system repair or restoration.
Why Replace This Part?
Rubber fuel pump mounts can harden, crack, split, collapse, or detach with age, fuel exposure, heat, and road vibration. A worn mount may allow the fuel pump to move, vibrate, or create extra noise, and can place stress on fuel lines and electrical connections. Replacing the mount helps restore secure fuel pump installation and quieter, more reliable operation.
When to Replace This Part
• The fuel pump mount is cracked, perished, split, or missing
• The fuel pump feels loose or moves on its bracket
• There is increased fuel pump noise or vibration
• The rear fuel pump or fuel lines are being replaced
• The mounting hardware has been removed during fuel system service
• Fuel pump alignment or bracket security needs to be restored
• The vehicle is undergoing classic Porsche fuel system restoration.
Where it fits on the car
This rubber mount fits at the rear fuel pump mounting point, securing the fuel pump to its bracket or body mounting area. It forms part of the fuel pump support assembly on Porsche 911 models using a rear-mounted fuel pump arrangement.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970338401
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
OE Match Fuel Pump is an OEM equivalent in-tank electric fuel pump designed to deliver consistent fuel pressure and flow to the engine under all operating conditions. Manufactured to match Porsche factory specifications, this fuel pump ensures reliable engine performance, smooth acceleration, and correct fuel delivery.
Fits:
Porsche 996 C2 3.4L up to >>2001
Porsche Boxster 986 up to >>2001
This OE Match replacement is engineered to mirror the original Porsche unit in fitment, electrical connections, fuel output, and operating noise levels. It installs directly into the fuel tank without modification and is suitable for both routine replacement and fault repair caused by fuel pump failure, pressure loss, or starting issues. Offering OEM-level performance at a more cost-effective price point, this fuel pump is an ideal alternative to genuine Porsche parts while maintaining factory-correct functionality and reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99662010200
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche Carrera GT 2003-06
The fuel pump relay is a precision replacement relay for the fuel-pump control circuit in the Porsche 986 Boxster and 996 911 (including Turbo and early Carrera GT) models. This relay controls the activation of the in-tank fuel pump, providing the necessary current to ensure correct fuel delivery under demand - making it vital for engine start-up, steady fuel pressure and safe operation.
Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 996 C2 / C4 / C4S 1998 - 2005
Porsche 996 Turbo 2001 - 2005
Porsche 996 GT3
Porsche Carrera GT 2004 - 2006
* Please check and match the part number of your relay in your car before ordering.
• Position: Mounted in the front luggage compartment fuse/relay panel or subsystems - controls power feed to the fuel pump relay circuit.
• Function: When the ignition is turned on or engine is running, the signal from ECU or shift lever energises this relay, sending current to the fuel pump so fuel pressure builds before engine cranking - crucial for proper fuel system operation.
• Applications: Ideal when the original relay has failed, is intermittent, shows corrosion on contacts, causes fuel-pump drop-outs, engine stumbling, or fails the self-check.
The fuel pump relay is a critical yet often overlooked part of the fuel delivery system.
A failing relay may manifest as:
• Engine cranks but won’t start (fuel pump never powers)
• Fuel pump prime is silent when ignition is turned on
• Engine stalls at random after start due to loss of pump voltage
• Intermittent “no-fuel pressure” faults or ECU logged errors
Replacing the relay with a correct unit ensures the fuel pump receives the proper current, realises full system pressure, and avoids mis-diagnosis of fuel pump or ECU faults.
When to replace:
• Original relay is over 10 years old, exposed to heat or aftermarket modifications
• You’ve installed a new fuel pump but issue persists (relay may be the culprit)
• You’re diagnosing no-start or stall symptoms that point to fuel pressure drop-out
• You’re restoring or prepping your vehicle and want to replace all wear-prone electrical relays
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99661510100
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
for RHD or LHD cars

Fits:
Porsche 986 Boxster - 2002 to 2004
Porsche 987.1 Boxster - 2005 to 2008
Porsche 987.1C Cayman MKI - 2006 to 2008
Porsche 996 C2 3.6ltr - 2002 to 2005
Porsche 997.1 C2 3.6Lltr MKI - 2005 to 2008
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99662013200
The product you are viewing cross references to these numbers
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