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Bmw 335I Fuel Injection Nozzle O-Ring Kits

Bmw 335I Fuel injection nozzle o-ring kits

Starting at $26.95, AutoBuffy stocks 1 fuel injection nozzle o-ring kits from Elring for the Bmw 335I. These small rubber seals sit where each fuel injector meets the intake manifold and fuel rail, preventing pressurized fuel vapor from escaping. When they harden, crack, or deform, you get fuel leaks, rough idle, and a real fire hazard.

Signs your Bmw 335I needs new fuel injector o-rings

  • Smell of raw fuel inside the cabin or under the hood at idle or after shutdown
  • Visible wet fuel residue or staining around the base or top of one or more injectors
  • Rough, uneven idle that worsens when the engine is fully warmed up
  • Hard start or extended cranking time, especially after the vehicle has been sitting
  • Check engine light with lean misfire or fuel trim codes (e.g., P0171, P0300-series)
  • Fuel economy drops noticeably with no other obvious cause

Which fuel injection nozzle o-ring kit should you buy for your Bmw 335I?

The right kit depends on whether you're replacing seals at the fuel rail inlet, the lower manifold seal, or both, and whether your engine runs standard gasoline, flex-fuel, or forced induction. Material matters most: the o-ring compound must be compatible with your fuel type and operating temperature, and the kit must include every seal position so you don't have to disassemble the rail twice.

OEM-spec rubber kit
Best for
Daily drivers on standard gasoline wanting a factory-correct fit
What you get
Pre-cut nitrile o-rings matched to OEM dimensions; straightforward drop-in replacement
Viton (FKM) upgraded kit
Best for
High-mileage engines, ethanol blends (E85), or any flex-fuel Bmw 335I
What you get
Superior heat and chemical resistance; lasts significantly longer than standard nitrile in harsh conditions
Full injector seal kit (upper + lower)
Best for
Complete injector service or any time injectors are removed for cleaning or replacement
What you get
Both the fuel-rail-side upper o-ring and the lower manifold cushion/pintle cap in one box; nothing left to leak
Multi-injector value kit
Best for
DIY mechanics servicing all cylinders at once on a Bmw 335I with 6 or 8 injectors
What you get
Bulk count of o-rings for every injector position, often with spare seals and o-ring lubricant included

Fuel injection nozzle o-ring kits brands we stock for your Bmw 335I

Elring
1 option · from $26.95

Replacing fuel injection nozzle o-rings on a Bmw 335I

Moderate⏱ 1–2 hoursFuel line disconnect tool setSocket and ratchet setSmall pick or o-ring removal toolClean lint-free ragsO-ring lubricant or clean engine oil

Begin by relieving fuel system pressure and disconnecting the battery before removing the fuel rail and lifting each injector free of the manifold. Use a pick tool to remove the old o-rings without scoring the injector body, then lightly lubricate the new o-rings before pressing them into their grooves. Reinstall the rail, restore fuel pressure, and check for leaks before starting the engine.

Frequently asked questions

How much does it cost to replace fuel injection nozzle o-ring kits on a Bmw 335I?
The parts alone start at $26.95 for the Bmw 335I. A shop will typically add one to two hours of labor, so total out-of-pocket cost depends heavily on how many injectors need service and local labor rates. Doing it yourself keeps the cost close to the parts price alone.
Can I drive my Bmw 335I with a leaking injector o-ring?
You should not. A leaking injector o-ring allows raw fuel to pool near hot engine components, which is a genuine fire risk. Beyond safety, unmetered fuel entering the manifold will skew your air-fuel mixture, damage the catalytic converter over time, and worsen fuel economy with every mile driven.
How long do fuel injector o-rings last on a Bmw 335I?
Standard nitrile o-rings typically last somewhere between 60,000 and 100,000 miles under normal conditions, but heat cycling, ethanol content in pump fuel, and extended oil-change intervals all accelerate hardening and cracking. It is good practice to replace them any time injectors are removed for any reason.
Do I need to replace all injector o-rings at once on my Bmw 335I?
Yes. If one o-ring has failed, the rest are the same age and have experienced the same heat cycles and fuel exposure. Replacing only the one that is visibly leaking means you will likely be back under the hood within months. A full kit costs little more and eliminates repeat labor.
What is the difference between the upper and lower injector o-rings on a Bmw 335I?
The upper o-ring seals the injector to the fuel rail under fuel pressure; a failure here causes an external fuel leak. The lower o-ring seals the injector tip to the intake manifold; a failure here causes a vacuum leak and unmetered air, leading to lean misfires and rough idle rather than a visible fuel leak.
Do I need any special tools to replace injector o-rings on a Bmw 335I?
In most cases, no specialty tools are required. You will need basic hand tools to remove the fuel rail, a fuel line disconnect clip tool if the rail uses quick-connect fittings, and a small pick or o-ring removal tool to extract the old seals without scratching the injector body. Always use the provided o-ring lubricant or clean engine oil during installation.

Shop fuel injection nozzle o-ring kits by year for the Bmw 335I

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More parts for your Bmw 335I

Control Arm Repair KitBattery Vent TubeControl ArmEngine Oil Cooler Cover SealEngine Timing SprocketInterior Panel RetainerWheel Bearing Retaining RingFuel Injector

Fuel injection nozzle o-ring kits for other Bmw models

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