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Injection pump belt. Porsche 911 1969-77 ❭ 99919203040
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
This OE Match injection pump belt is a replacement drive belt for the mechanical fuel injection system on Porsche 911 models from 1969 to 1977. It is designed to match the original-style fitment and function. This replacement belt helps drive the mechanical fuel injection pump, supporting correct fuel delivery and reliable engine running.
Fits:
Porsche 911 1969 - 1977
Diagram ref no 21
The injection pump belt transfers rotational drive to the fuel injection pump. This allows the pump to operate in sync with the engine and deliver fuel correctly. A good belt is essential for accurate fuel delivery, smooth running, and dependable engine performance on models using mechanical fuel injection.
Functions
• Replaces the injection pump drive belt
• Drives the mechanical fuel injection pump
• Supports correct fuel delivery and engine running
• Helps maintain injection pump timing and operation
• Replaces cracked, worn, stretched, frayed, or missing belts
• Suitable for fuel injection system service and preventative maintenance
• OE Match replacement for classic Porsche 911 engine service.
Why Replace This Part?
Injection pump belts wear over time due to heat, age, tension changes, pulley contact, vibration, and engine bay conditions. A worn belt can crack, stretch, fray, slip, or fail completely. If the belt fails, the injection pump may stop operating correctly, causing poor running, loss of fuel delivery, difficult starting, or engine stoppage. Replacing the belt helps maintain reliable mechanical fuel injection performance.
When to Replace This Part
• The injection pump belt is cracked, glazed, frayed, loose, or worn
• Fuel injection pump service or adjustment is being carried out
• Engine running is poor due to suspected injection pump drive issues
• The belt tension is incorrect or unstable
• The injection pump, pulleys, or related components are being serviced
• Preventative belt replacement is being carried out during scheduled maintenance
• The vehicle is undergoing Porsche 911 fuel injection or engine restoration.
Where it fits on the car
This belt fits within the mechanical fuel injection pump drive system on Porsche 911 models from 1969 to 1977. It runs around the relevant injection pump drive pulleys according to the factory engine layout.
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99919203040
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- Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
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- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
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- Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
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- Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
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with bolt and protective cap.

Fits:
Porsche 991.1 Carrera 3.4L / 3.8L 2011-16 (A104)
Porsche 991.2 Carrera 3.0L 2017-19
Porsche 991 Turbo 3.8L 2014-20
Porsche 981 Boxster 2012-16
Porsche 981 Boxster Spyder 2016
Porsche 981 Cayman 2014-16
Porsche 981 Cayman GT4 2016
Porsche 718 (982) Boxster 2017-21
Porsche 718 (982) Cayman 2017-21
Porsche 95B.1 Macan 3.0L / 3.6L 2013-18
Material: Plastic
Outer Diameter: 70 mm
Pulley Surface Width: 26 mm
Click 'Zoom in' for large parts diagram.
Diagram ref no 8
Related reference numbers
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0PB145257
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- Porsche 957 Cayenne 3.0L Diesel 2007-10
- Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
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- Porsche 970.2 Panamera Diesel V6 3.0L (250Hp) 2014-16
- Porsche 95B.1 Macan S Diesel 3.0L V6 (258Bhp) 2014-18

Outer Diameter: 65mm
Width: 26mm
Inner Diameter: 17mm
Fits:
Porsche 957 Cayenne 3.0L DIESEL 2009-12
Porsche 958 Cayenne 3.0L DIESEL
Porsche 970 Panamera 3.0L DIESEL 2012-16
Porsche 95B Macan 3.0L TDI 2014-18
Click 'Zoom in' for large parts diagram.
Diagram ref no 12
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95510211921
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- Porsche 95B.1 Macan S Diesel 3.0L V6 (258Bhp) 2014-18
This tensioner helps maintain the correct tension and routing of the accessory (serpentine) drive belt, which powers multiple engine-driven components such as the alternator, air conditioning compressor, and other auxiliary systems. By applying consistent force to the belt, the tensioner reduces slack, prevents belt slip, and supports smooth belt operation under varying engine loads and temperatures.
Fits:
Porsche 958 Cayenne 3.0L DIESEL 2011 - 2018
Porsche 970 Panamera 3.0L DIESEL 2012 - 2016
Porsche 95B.1 Macan 3.0L TDI 2014 - 2018
Diagram ref no 1
Application:
Accessory drive belt tensioner assembly - installed in the front engine accessory drive system to control belt tension and alignment.
Function:
• Applies and regulates tension to the accessory drive belt
• Maintains proper belt alignment over pulleys
• Reduces belt chatter and premature wear
• Helps ensure reliable operation of belt-driven accessories
A worn or weak belt tensioner can lead to belt slip, increased noise (squeal or chirp), uneven belt wear, and reduced accessory performance. Replacing a failing tensioner restores proper tension control and helps prolong the life of the belt and pulleys - improving reliability and reducing the risk of accessory drive failures.
Replace the tensioner if you notice:
• Squealing or chirping from the belt area
• Visible belt wear or fraying
• Belt slipping under load
• Rough or noisy pulley bearing movement
• During routine accessory belt or tensioner service intervals
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
958903133
The product you are viewing cross references to these numbers
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