O-Ring Genuine Porsche part 99970711341

Oil tube seal for crankcase distribution oil pipes.
Sold each.
Fits:
Porsche 911 1970-89
Porsche 964 1989-94
Porsche 993 1994-98
Click 'Zoom in' for large parts diagram.
Diagram Ref No 14.

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9997071124A

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Fuel Tank Level Sender Seal 

Maintain the integrity of your Porsche fuel system with this OE Match Fuel Tank Level Sender Seal for Porsche 964 and Porsche 993 models. This essential sealing gasket sits between the fuel tank and the fuel level sender unit, creating a fuel-tight seal that prevents leaks, fuel vapour escape and contamination from entering the tank.

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97
• Porsche 993 (911) TURBO S 1994-97

Diagram ref no 2

Although small and inexpensive, the fuel tank level sender seal plays a vital role in the safe and reliable operation of the fuel system. Over time, the original seal can harden, shrink or deteriorate due to constant exposure to fuel, heat and age, increasing the risk of fuel leaks and fuel odours inside the vehicle.

Manufactured to OE Match specifications, this replacement seal provides the correct fit and sealing performance for maintenance, fuel sender replacement and restoration projects.

What Does the Fuel Tank Level Sender Seal Do?

The fuel level sender seal creates a secure seal between the fuel tank and the fuel level sender assembly.

Its primary functions include:

• Preventing fuel leaks
• Sealing fuel vapours inside the tank
• Protecting against contamination
• Maintaining fuel system integrity
• Supporting accurate fuel sender operation
• Reducing fuel odours
• Helping maintain vehicle safety

Without a properly functioning seal, fuel and vapour can escape from the sender mounting area.

Why Do Fuel Tank Level Sender Seals Fail?

Fuel system seals operate in a harsh environment and are constantly exposed to fuel and temperature changes.

Common causes of failure include:

• Age-related hardening
• Fuel exposure
• Ethanol-blended fuel degradation
• Heat cycling
• Compression fatigue
• Shrinkage over time
• Incorrect installation
• Disturbance during sender removal

After many years of service, even an original seal that appears intact may no longer provide an effective seal.

Symptoms of a Failing Fuel Sender Seal

Common warning signs include:

• Fuel smell inside or around the vehicle
• Dampness around the sender unit
• Visible fuel seepage
• Fuel stains near the sender mounting area
• Vapour leaks
• Deteriorated or flattened seal
• Leaks after sender replacement

These symptoms should never be ignored, as fuel leaks present both safety and reliability concerns.

When Should the Fuel Tank Level Sender Seal Be Replaced?

Replacement is recommended when:

• Removing the fuel level sender
• Replacing the fuel sender unit
• Servicing the fuel tank
• Fuel odours are present
• Fuel leaks are discovered
• Carrying out preventative maintenance
• Restoring a Porsche 964 or 993
• The original seal shows signs of ageing

Most Porsche specialists recommend replacing the seal whenever the sender unit is removed.

Why Replacement Matters

Replacing an ageing sender seal helps protect the fuel system and vehicle.

Benefits include:

• Prevention of fuel leaks
• Reduced fuel vapour escape
• Improved safety
• Protection against contamination
• Elimination of fuel smells
• Reliable fuel system sealing
• Low-cost preventative maintenance
• Long-term peace of mind

For such an inexpensive component, replacing the seal can prevent far more costly repairs and fuel system issues.

Related reference numbers
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99970711540

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Collapsible CNC Alloy Oil Tube Kit
Sold each – 4 required per car

The OE Match Collapsible CNC Alloy Oil Tube Kit is a high-quality replacement solution for the engine oil return tubes fitted to air-cooled Porsche 911, 964 and 993 models.

Fits:

• 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 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97
• Porsche 993 (911) TURBO S 1994-97

Diagram Ref No 13

Manufactured from precision CNC-machined aluminium alloy, these collapsible oil tubes offer improved durability and easier installation compared with conventional rigid oil return pipes.

Supplied as a individually with replacement seals, four kits are needed per engine and these are ideal for repairing engine oil leaks, replacing ageing oil return pipes or carrying out a comprehensive engine restoration.

What Does the Collapsible Oil Tube Do?

The oil return tubes allow engine oil to drain from the cylinder head and valve gear areas back towards the engine crankcase.

This return flow is an important part of the engine's lubrication system, allowing oil to circulate correctly while preventing it from escaping through the engine casing.

The collapsible design allows the tubes to be compressed during installation and extended into position, making replacement considerably easier than fitting conventional one-piece rigid tubes.

Why Do Oil Return Tubes Fail?

Original oil return tubes and their seals are exposed to repeated heating and cooling cycles, engine vibration and general ageing.

Common causes of failure include:

Hardened or deteriorated rubber O-ring seals Corrosion of original metal oil tubes Cracked or damaged tube sections Distortion caused by previous repairs Incorrect installation or damaged sealing surfaces Long-term exposure to engine heat and oil contamination

In many cases, oil leaks develop because the original seals lose their flexibility and can no longer maintain an effective seal.

When Should They Be Replaced?

Replacement is recommended when the oil return tubes show visible corrosion, physical damage or signs of oil leakage.

Common symptoms include:

Oil dripping from beneath the engine Wet or oily areas around the return tubes Burning oil smells caused by oil reaching hot exhaust components Increasing oil consumption due to external leakage Deteriorated or hardened oil tube seals

The tubes should also be inspected during engine rebuilding, cylinder head servicing or restoration work.

Why Upgrade to CNC Alloy Collapsible Oil Tubes?

The CNC-machined aluminium alloy construction provides a durable replacement for ageing original components.

Unlike rigid oil return tubes, the collapsible design allows the replacement tubes to be fitted without the extensive dismantling normally associated with removing fixed-length tubes.

This makes them particularly useful for repairing oil leaks while the engine remains assembled.

Replacing all four tubes together also provides an opportunity to renew the complete set of seals, reducing the likelihood of further leaks from other ageing tubes.

Installation Notes

Before installation, inspect the oil return tube mounting points and sealing surfaces for damage or contamination.

Lubricate the replacement seals with a suitable lubricant, install the tubes in their compressed position and extend them fully into the correct mounting locations.

Ensure the tubes are correctly seated and secured according to the manufacturer's instructions.

Following installation, run the engine and inspect the repaired areas for oil leaks.

Porsche 911, 964 & 993 Collapsible Oil Return Tubes and Engine Lubrication Parts

The engine oil return tubes are essential components of the air-cooled Porsche flat-six lubrication system, allowing oil to return from the cylinder head assemblies to the crankcase.

Over time, original oil return tubes can develop leaks due to corrosion, damaged seals and repeated engine heat cycles. These problems are particularly common on older Porsche 911, 964 and 993 models.

The OE Match Collapsible CNC Alloy Oil Tube Kit, reference 93010704001, provides a practical replacement solution featuring precision-machined aluminium alloy tubes and new sealing components.

Buy a set of 4 oil Tubes and Save money

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93010704001

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Fuel tank gauge O-Ring. 44 x 4.
Fits:
Porsche 964 1989-94
Porsche 993 1994-98
Click 'Zoom in' for large parts diagram.
Diagram ref no 2

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99970711540

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Oil tube seal for crankcase distribution oil pipes.
Round oil return tube O-ring used at the outer ends of the crankcase oil distribution / return tubes. Each tube uses two seals, and a complete engine typically requires multiple O-rings depending on tube type and configuration (often eight per engine on many 911/964/993 applications).
Sold each.
Fits:
Porsche 911 1970 - 1989
Porsche 964 1989 - 1994
Porsche 993 1994 - 1998
Diagram ref no 14.
This seal provides a leak-tight joint between the oil return tube and the crankcase or associated oil galleries. By sealing the tube ends, it:
• Prevents engine oil leaks at the tube junctions.
• Helps maintain correct oil circulation and system pressure.
• Keeps oil off the heat exchangers, exhaust and underside of the engine, reducing smells, smoke and contamination.
With age, heat and constant oil exposure, original O-rings can harden, flatten, crack or shrink. When they fail:
• Oil begins to weep or drip from the crankcase / tube junctions.
• The underside of the engine, heat exchangers and exhaust can become oil-soaked, causing burning smells and smoke.
• You may see oil spots under the car and gradual oil loss between services.
Replacing tired seals is a low-cost, high-impact fix that significantly reduces leaks and keeps the engine bay cleaner.
When to Replace
Consider replacing these oil tube seals if:
• You see oil leaks or dampness around the oil return tubes or crankcase unions.
• The engine is undergoing an oil return tube replacement (solid or collapsible).
• You’re performing an engine refresh, top-end rebuild, or major oil system service.
• The car shows persistent oil drips on the floor despite other seals being renewed.

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9997071124A

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O-ring cylinder base 102 x 2. 
Fitted into the cylinder base sealing groove, the O-ring compresses between the cylinder and crankcase to form an oil-tight barrier that withstands temperature changes and engine vibration.
Sold each, 6 required per car.
Fits:
Porsche 964 Carrera 2 / Carrera 4 / RS / turbo  1989 - 1994
Porsche 993  Carrera 2 / Carrera 4 / Carrera S / Carrera 4S / turbo 1994 - 1997

Diagram ref no 2
This OE Match O-ring is manufactured to OE-equivalent dimensions and material properties to provide a reliable seal at the cylinder-to-case interface. Correct sealing here is essential to prevent oil seepage during heat cycles and maintain a clean, properly sealed engine during rebuild or maintenance work. Ideal for engine overhauls, reseals, or any time cylinders are removed, this direct-fit O-ring restores the original sealing function without modification.
Old O-rings can harden, flatten, or crack with age and heat, increasing the likelihood of oil seepage at the cylinder base. Replacing them during engine work helps ensure a proper reseal, reducing leaks and protecting surrounding components from oil contamination.
When to replace:
•  During engine rebuilds or top-end work (cylinders removed)
•  Any time cylinder bases are resealed
•  Visible oil seepage at cylinder-to-case area
•  High-mileage preventative reseal

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99970715240

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Oil Thermostat O-Ring on Engine Case - 39.2 x 3mm
OE Match oil thermostat O-ring on engine case, 39.2 x 3mm, for Porsche 911, 914-6, 964, and 993 models. This replacement sealing O-ring helps prevent oil leaks at the engine-mounted thermostat area and supports correct engine oil system sealing.
Fits:
Porsche 911 - 1970 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1997
Porsche 914-6 - 1970 to 1976

Diagram ref no 34
The O-ring seals the joint between the oil thermostat and engine case. A correctly fitted seal helps prevent oil seepage, maintain oil system integrity, and keep the engine area clean and leak-free.
Functions
• Replaces the oil thermostat O-ring
•  Seals the thermostat connection on the engine case
•  Helps prevent engine oil leaks
•  Supports correct oil system sealing
•  Suitable for oil thermostat, engine case, or oil leak repair
•  Replaces hardened, flattened, cracked, swollen, or damaged O-rings
•  OE Match replacement for Porsche engine oil system service.
Why Replace This Part?
Oil thermostat O-rings can harden, flatten, crack, swell, or lose sealing ability due to heat, age, oil exposure, and pressure cycles. A worn or damaged O-ring may allow oil seepage around the thermostat area, causing oil residue, low oil level concerns, engine bay contamination, or failed inspection. Replacement is recommended whenever the thermostat is removed or oil leakage is present.
When to Replace This Part
•  Oil is leaking around the engine-mounted thermostat area
•  The oil thermostat has been removed or serviced
•  The O-ring is hard, flattened, cracked, swollen, or damaged
•  Engine case sealing work is being carried out
•  Oil seepage or oil residue is visible around the thermostat connection
•  Preventative replacement is required during engine service
Where it fits on the car
This O-ring fits at the oil thermostat connection on the engine case. It forms part of the engine oil sealing system on Porsche 911, 914, 964, and 993 models.

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99970731440

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