push rod Genuine Porsche part 90111006300

Fuel injection pump drive gear. On MFI Pump.
Fits:
For vehicles with Mechanical Fuel Injection
Porsche 911 E/S 1969-71
Porsche 911 T-E/E/S Carrera 2.7 1972-73
Porsche 911/98 1974-77
Click 'Zoom in' for large parts diagram.
Diagram ref no 12

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90111002200

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Fuel Injector Lines Set.
Restore the safe and reliable delivery of fuel to your classic Porsche's engine with this OE Match Fuel Injector Lines Set, manufactured as a direct replacement. Produced to OE-style specifications, this complete set of fuel injector lines is designed to deliver fuel from the fuel distribution system to each injector while maintaining the correct pressure and flow required for efficient engine performance.
Fits:

• Porsche 911 1969-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1976 2.7L / 1976-77 3.0 Carrera  

Diagram Ref No: 5, 6, 7, 8, 9 And 10
Fuel injector lines operate under high pressure and are continually exposed to heat, vibration, and fuel. Over time, they can become brittle, corroded, kinked, or develop leaks, compromising both engine performance and safety. This OE Match replacement set restores dependable fuel delivery and the original factory appearance, making it ideal for preventative maintenance and high-quality restoration projects.  
What This Product Does:

• Delivers fuel from the fuel distribution system to each injector.
• Maintains the correct fuel pressure for efficient engine operation.
• Ensures consistent fuel flow to all cylinders.
• Helps promote smooth engine performance and throttle response.
• Supports efficient combustion and fuel economy.
• Restores the original factory routing and appearance.
• Replaces ageing, damaged, or leaking fuel injector lines.

Symptoms Of Wear Or Failure:

• Visible fuel leaks around the injector lines.
• Cracked, corroded, or deteriorated fuel lines.
• Fuel smell within the engine compartment.
• Poor engine performance or hesitation.
• Rough idle or engine misfires.
• Difficulty starting the engine.
• Reduced fuel pressure.
• Kinked or damaged injector lines.
• Dampness or staining around fuel line connections.
• Increased risk of fuel leaks due to ageing components.

Why Replacement Matters:

• Ageing or damaged fuel injector lines can reduce fuel delivery efficiency and, more importantly, create dangerous fuel leaks within the engine compartment. Even minor leaks can affect engine performance while significantly increasing the risk of fire.
• Replacing worn fuel injector lines restores safe, consistent fuel delivery and helps maintain smooth engine operation, reliable starting, and correct fuel pressure. An OE Match replacement set provides the correct fit and factory-style routing, helping preserve both the performance and originality of your classic Porsche while improving long-term reliability.

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91111002SET

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Throttle Linkage for 911 with Mechanical Fuel Injection MFI Porsche 911 1969-1971
Fits:
Porsche 911, E / S 1969-1971)
with mechanical injection system
Click 'Zoom in' for large parts diagram.
Diagram ref no 33

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90111005700

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Drive gear on camshaft, Left.
Fits:
Porsche 911 1969-73
For cars with mechanical fuel injection only
Click 'Zoom in' for large parts diagram.
Diagram ref no 18

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90111002300

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MFI Pump Drive Gear on Camshaft, Left

The OE Match MFI pump drive gear is a replacement component for the left-hand camshaft on Porsche 911 models manufactured between 1969 and 1973 and equipped with mechanical fuel injection (MFI).

This gear forms part of the drive system for the Bosch mechanical fuel injection pump, transferring rotational movement from the left camshaft to the injection pump through the toothed drive belt.

Correct operation of this drive system is essential for maintaining the mechanical relationship between the engine and fuel injection pump, helping ensure accurate fuel delivery and consistent engine performance.

What Does the MFI Pump Drive Gear Do?

The MFI pump drive gear is mounted on the left-hand camshaft and drives the toothed belt connected to the mechanical fuel injection pump.

As the engine rotates, the camshaft turns the drive gear, which operates the injection pump in synchronisation with the engine.

This allows the mechanical injection system to deliver fuel at the correct point in the engine's operating cycle.

Why Does It Fail?

Although designed for long service life, the drive gear can deteriorate through age, wear or damage.

Common causes include:

• Worn or damaged gear teeth
• Corrosion or surface deterioration
• Incorrect toothed belt tension or alignment
• Damage during engine or injection system repairs
• Wear or damage to the gear mounting arrangement
• Long-term mechanical stress

A damaged gear can affect the operation of the injection pump drive system and may eventually cause the toothed belt to slip or lose correct engagement.

When Should It Be Replaced?

Replacement is recommended when the original drive gear shows visible tooth wear, cracking, corrosion or mechanical damage.

The gear should also be inspected during:

Mechanical fuel injection pump servicing MFI drive belt replacement Camshaft removal or replacement Engine rebuilding or restoration Investigation of injection pump drive problems

Incorrect injection pump timing, irregular engine operation or damage to the MFI drive belt may indicate a problem within the drive system and should prompt further inspection.

Confirm compatibility using the original part number and engine specification before ordering.

Installation Notes

Correct installation and alignment are essential for reliable mechanical fuel injection operation.

Inspect the toothed drive belt, associated injection pump gear, mounting hardware and related components for wear or damage.

Following installation, check the drive belt tension and mechanical fuel injection pump timing according to the Porsche workshop procedure.

Porsche 911 Mechanical Fuel Injection Pump Drive Gears & MFI Components

The mechanical fuel injection system fitted to selected early Porsche 911 models relies on accurate mechanical synchronisation between the engine and Bosch injection pump.

The left-hand camshaft drive gear is an essential component of this arrangement, transmitting rotational movement through the toothed belt to operate the fuel injection pump.

Over time, wear, corrosion or damage to the drive gear can compromise the reliability of the MFI drive system.

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90111002300

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Fuel Injection Pump Drive Gear, On MFI Pump.

The OE Match Fuel Injection Pump Drive Gear is a replacement toothed drive gear fitted directly to the mechanical fuel injection pump used on selected classic Porsche 911 models.

Fits:
For vehicles with Mechanical Fuel Injection

• Porsche 911 E/S 1969-71
• Porsche 911 T-E/E/S Carrera 2.7 1972-73
• Porsche 911/98 1974-77

Diagram Ref No 12

This gear forms a critical part of the Porsche mechanical fuel injection, or MFI, drive system.

It works together with the toothed injection-pump drive belt and the corresponding drive gear mounted on the left-hand camshaft. As the engine rotates, the camshaft-mounted gear drives the toothed belt, which in turn rotates this gear on the MFI pump.

This mechanical connection keeps the injection pump synchronised with engine speed and position so that fuel can be metered and delivered at the correct point in the engine cycle.

Wear, damaged teeth, incorrect fitment or looseness in the drive gear can interfere with this synchronisation and may contribute to poor engine running, incorrect injection timing, belt wear or complete loss of injection-pump drive.

Replacing a worn or damaged gear helps restore reliable MFI pump drive and preserves the precise mechanical relationship between the engine and injection pump.

What This Product Does:
The MFI Pump Drive Gear transfers rotational drive from the engine to the mechanical fuel injection pump.

Its main functions are to:

• Drive the mechanical fuel injection pump.
• Engage with the toothed MFI drive belt.
• Maintain correct injection-pump timing.
• Keep the pump synchronised with engine rotation.
• Support accurate mechanical fuel metering.
• Maintain stable engine performance.
• Provide a correctly profiled drive surface for the MFI belt.
• Replace a worn, damaged or incorrectly fitted original gear.

Symptoms Of Wear Or Failure:
Possible signs include:

• Visible tooth wear.
• Chipped teeth.
• Rounded tooth profiles.
• Cracked or damaged gear.
• Excessive gear movement.
• Gear running out of true.
• MFI belt tracking incorrectly.
• Accelerated belt wear.
• Belt dust around the drive area.
• Repeated injection-pump timing problems.
• Difficult starting.
• Rough running.
• Misfiring.
• Poor throttle response.
• Reduced engine performance.
• MFI pump no longer being driven correctly.

Because many of these running symptoms can also be caused by MFI pump calibration, ignition or fuel-system faults, the complete system should be diagnosed before replacement.

Why Replacement Matters:
Replacing a worn or damaged Fuel Injection Pump Drive Gear helps restore:

• Reliable MFI pump drive.
• Correct belt engagement.
• Stable mechanical injection timing.
• Consistent fuel delivery.
• Smooth engine operation.
• Correct throttle response.
• Reliable belt tracking.
• Long-term MFI system dependability.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90111002200

The product you are viewing cross references to these numbers

Mechanical fuel injection pump pipe hose - oil line.
Fits:
Porsche 911 E/S 1969-77
Only for cars with Mechanical Fuel Injection
Diagram ref no 57

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90111004103

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Mechanical fuel injection pump pipe hose - oil line.
Fits:
Porsche 911 E/S 1969-77
Only for cars with Mechanical Fuel Injection
Diagram ref no 57

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90111004103

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Mechanical fuel injection pump pipe hose - oil line.
in Yellow passivated.
Fits:
Porsche 911 E/S 1969-77
Only for cars with Mechanical Fuel Injection
Diagram ref no 57

Related reference numbers
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90111004103

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