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Belts All Types
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Belt size: 10 x 713 mm
The V-belt runs between the crankshaft pulley and the alternator/fan pulley. It’s the primary mechanical link that spins the alternator to charge the battery and, on air-cooled 911s and 914-6 models, turns the engine cooling fan.
Fits:
Porsche 911 1965 - 1973
Porsche 911 Turbo 1976 >>
Porsche 911 SC 1974 - 1979 (Check Size of your Belt)
Porsche 911 SC 1980 - 1983
Porsche 911 3.2L 1984 - 1989
Porsche 914 1970 - 1976
Please note: Always confirm against the belt size currently fitted and pulley setup before ordering.
Why Replacement Matters - With age and mileage, belts:
• Crack, glaze, or harden, reducing grip
• Stretch, making correct tension impossible
• Begin to slip, causing charging issues and, on air-cooled engines, reduced cooling fan speed
A slipping or failing belt can lead to battery discharge, warning lights, overheating, or being stranded. Fitting a fresh belt restores reliable alternator and fan drive, protecting both the engine and electrical system.
When to Replace - Consider replacing the alternator belt if:
• You see cracks, fraying, glazing, or missing chunks in the belt rubber
• The belt squeals on startup or under load
• The belt has stretched and can’t be tensioned correctly
• You’re doing routine service on a classic 911 / 914-6 or preparing for a long trip
• The car is undergoing engine-out work or restoration
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9991921765A
The product you are viewing cross references to these numbers
- 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)
Width: 10 mm, Length: 725 mm

Fits:
Porsche 911 Turbo/SC 1974-79 (Please choose by size)
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919209750
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50

Belt size: 9.5 x 695
Fits:
Porsche 911 SC 1980-83
Porsche 911 1984-89
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9991923135A
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Belt size: 9.5 x 825

Fits:
Porsche 912 1965-69
Porsche 356 1950-65
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919200650
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Belt size: 9.5 x 825

Fits:
Porsche 912 1965-69
Porsche 356 1950-65
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919200650
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
The Genuine Porsche 99919203040 injection pump belt is an OE toothed drive belt for the mechanical fuel injection pump on selected Porsche 911 1969–1977 models. It helps maintain correct injection pump timing, stable fuel delivery and original MFI engine performance. Ideal for routine service, fuel injection system restoration or replacing an aged, worn or unknown-history belt.
Fits:
Porsche 911 1969 - 1977
Diagram ref no 21
This belt is used on Porsche 911 models equipped with a mechanical fuel injection system, where it drives the injection pump from the engine drive system.
What This Part Does / Functions
• Drives the mechanical fuel injection pump
• Helps maintain correct injection pump timing
• Supports consistent fuel delivery to the engine
• Helps ensure smooth engine running and throttle response
• Transfers rotational drive accurately through the toothed belt profile
• Helps prevent injection timing issues caused by belt wear or slip
• Provides OE Porsche fitment for the original MFI pump drive system
• Replaces an aged, cracked, stretched or worn injection pump belt.
Why Replace This Part?
The injection pump belt is a critical service item on mechanical fuel injection engines. Over time, the belt can age, crack, stretch, wear or lose tooth definition. If the belt slips, wears excessively or fails, the injection pump may lose correct timing, which can cause poor running, misfiring, difficult starting or incorrect fuel delivery. Replacing it with a Genuine Porsche OE injection pump belt helps maintain accurate MFI pump operation and supports the original performance and drivability of the classic Porsche 911 engine.
When to Replace This Part
• During scheduled mechanical fuel injection system service
• If the belt is cracked, worn, frayed or visibly aged
• If injection pump timing is being reset or adjusted
• During engine rebuild, MFI pump service or fuel system restoration
• If the belt has been contaminated by oil, fuel or debris
• If the belt age or service history is unknown
• When recommissioning a stored classic Porsche 911
• When restoring the engine with correct OE Porsche service parts.
Where It Fits on the Car
This belt fits on the engine mechanical fuel injection system, driving the mechanical injection pump. It is installed in the MFI pump drive area and works with the injection pump pulley system to maintain correct pump timing.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919203040
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
The Gates injection pump belt is an OEM-quality toothed drive belt designed for Porsche 911 models equipped with the Mechanical Fuel Injection (MFI) system. Manufactured as a direct replacement for Porsche part number 99919203040, this precision-engineered belt synchronises the mechanical fuel injection pump with the engine, ensuring accurate fuel delivery and optimum engine performance.
Fits:
Porsche 911 1969 - 1977
Diagram ref no 21
A genuine Gates toothed injection pump drive belt, manufactured as a direct replacement for Porsche part number 99919203040 for MFI systems. Drives the mechanical fuel injection pump in precise synchronisation with the engine, ensuring accurate fuel metering, smooth engine operation, and consistent performance across the rev range.
Key Features & Benefits
• Genuine Gates OEM-quality drive belt
• Direct replacement for Porsche 99919203040
• Precision toothed belt for MFI systems
• High-strength reinforced construction
• Excellent resistance to heat, wear, and stretching
• Maintains accurate fuel injection pump timing
• Ideal for engine rebuilds, restoration projects, and routine maintenance
Why Replacing the Injection Pump Belt
Matters The mechanical fuel injection belt is essential for maintaining precise fuel delivery. As it ages, the belt can stretch, crack, or deteriorate, affecting injection timing and engine performance. Replacing it at the recommended interval helps preserve reliable operation and protects the mechanical fuel injection system.
When to Replace the Injection Pump Belt
• During engine rebuild or cylinder head overhaul
• During mechanical fuel injection (MFI) pump servicing
• If the belt shows cracks, fraying, or worn teeth
• If oil contamination is present
• If the service history is unknown
• As part of preventative maintenance on classic MFI-equipped Porsche engines
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919203040
The product you are viewing cross references to these numbers
- 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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919203040
The product you are viewing cross references to these numbers
-
air cooling 911 1978-83 105-00
-
air cooling 911 1970-73 105-00
-
injection system cylinder head and injection pump 911 E/S UPTO 1971 and 911 911 T-E/E/S, CARRERA 2.7 1972 ONWARDS 107-20
-
air cooling 911 1987-89 105-00
-
accessories 911 1978-83 001-00
-
air cooling 911 1984-86 105-00
-
Tool, jack, stickers 911 1984-86 001-00
-
tool, jack 911 1987-89 001-00
-
Air Cooling 911 1974-77 105-00
-
Mechanical injection right for Model 911/83 1974-77 107-25
-
air cooling 911 1965-69 105-00
-
injection system cylinder head and injection pump for 911 E/S 1969 onwards 107-20
-
engine electrics 912 1965-69 901-05
-
air cooling 911 TURBO 1975-77 105-00
Belts – all types for alternator, fan, power steering and more
At Design911, we supply a wide range of engine and accessory drive belts for Porsche models, covering alternator, cooling fan, power steering and other auxiliary systems, plus related tensioners and pulleys. Whether you are carrying out routine maintenance or refreshing a higher‑mileage engine bay, you can choose from Genuine-style and carefully selected aftermarket options to suit how you use your Porsche.
Why do Porsche belts matter?
Belts are critical to how reliably your Porsche runs from day to day. They transfer drive from the crankshaft to key ancillaries such as the alternator, power steering pump and cooling fan, and in some applications form part of the engine’s timing system. Over time, heat, mileage, contamination and simple ageing can cause cracking, glazing, stretch or noise, while bearings in tensioners and idlers can wear. Replacing tired belts and related components with correctly specified parts helps keep your Porsche dependable, avoids inconvenience from belt slip or failure and supports the long‑term health of driven accessories.
- Keep your Porsche running smoothly by maintaining drive to essential ancillaries
- Help protect engine and charging systems where correct belt drive is required
- Reduce niggles such as squealing, chirping, belt dust or visible cracking
- Support long‑term enjoyment, pride of ownership and potential resale value with evidence of proper maintenance
Common options & kits
Individual replacement parts
Specific belts, tensioners, idlers or pulleys to address a particular drive run without changing everything at once. This is ideal when you are solving a localised issue or following a service schedule item on a particular belt.
- Ideal for targeted maintenance or repairs on a single belt circuit
- Lets you replace only what is required at a given service
- Helps keep initial outlay under control while still using quality components
Matched sets or pairs
Belts and related parts supplied together so both sides of a system, or closely linked items, are renewed at the same time. This is a sensible approach where access is involved or where you want consistent age and condition across the drive.
- Consistent behaviour and wear characteristics across the drive system
- Helps avoid mixing very old and brand‑new parts on the same run
- Well suited to scheduled maintenance or preparation ahead of long trips
Complete kits
Grouped parts designed to refresh a whole belt system in one go, for example an auxiliary drive kit including belt, tensioner and idlers. These are particularly useful during engine rebuilds or when you want peace of mind that all related items have been changed together.
- Everything specified for a given belt run in a single matched package
- Saves time compared with sourcing each component individually
- Ideal when overhauling or restoring your Porsche’s engine bay
Brands available in this category
For this category we stock a wide choice of trusted brands for Porsche models. You can also browse and filter by brand on this page to focus on your preferred manufacturers.
Dayco
Dayco is a leader in the Original Equipment market and supplies many Porsche belt applications as OE or OE‑equivalent parts. Their belts are engineered to closely follow original dimensions and construction, making them a strong choice for routine servicing, higher‑mileage refreshes and rebuild projects where you want Porsche‑specific fitment backed by a global belt specialist.
Gates
Gates develops automotive and heavy‑duty drive system components with a focus on robust construction and consistent running. For Porsche models this typically includes auxiliary drive belts, tensioners and idlers, offering dependable options when you are maintaining or refreshing driven systems used in everyday and demanding conditions.
Kits / package solutions
Design911 also offers curated kit solutions that bundle compatible parts for particular Porsche applications. These can simplify ordering, reduce the chance of missing small but important items, and help ensure the components you fit are intended to work together on your specific model and engine code.
Meyle
Meyle is known for practical replacement parts, often with “HD” variants aimed at durability. While widely associated with suspension and steering, Meyle components are chosen by many Porsche workshops as a value‑conscious alternative where a robust everyday solution is required.
OE Match
OE Match focuses on parts designed to mirror original equipment specification at a sensible cost. For belt‑related components this makes OE Match a useful option when you want OEM‑equivalent fit and function while keeping ongoing running costs under control on regularly used Porsche models.
When should you review or replace your Porsche belts?
Checking belts and related components regularly helps you spot wear, damage or age‑related deterioration before it affects refinement or leads to more extensive repairs. On a Porsche, this is especially relevant as many belts are exposed to heat, fluid contamination and long service intervals.
- Existing belts show cracking, frayed edges, glazing (shiny surfaces) or visible splitting
- You notice squealing, chirping, belt dust or signs of slip, particularly on start‑up or under load
- Charging, cooling or power steering performance feels inconsistent due to possible belt issues
- You are already replacing items such as water pump, alternator or tensioner and want fresh belts at the same time
- The belts are oil or coolant contaminated, or have been in service for an extended interval
If any of these apply, it is a good time to review the belts on your Porsche and replace anything that is past its best so your car stays dependable and enjoyable to drive.
Explore belts with Design911
Browse belts of all types for Porsche at Design911 — from individual auxiliary belts and tensioners to complete drive kits — and find options to suit routine maintenance, preventative refreshes and full engine projects across a wide range of Porsche models.
