AUTO OCCASION Fuel Injector Seal Kit for GM 1.4L/1.5L Engines — Part 55577403, O‑rings & Lower Seals (2016–2020 Buick/Chevy/GMC)

AUTO OCCASION fuel injector seal kit (part 55577403) replaces worn injector seals for compatible 2016–2020 GM 1.4L/1.5L engines to restore a tight fuel system fit.

This seal kit contains the gaskets and O-rings needed when servicing fuel injectors on a range of GM small-displacement engines. It’s manufactured to match the shape and dimensions of common original equipment seals so you can swap them during injector maintenance, rebuilds, or when troubleshooting leaks, poor idle, or fuel odor. Before buying, verify your vehicle’s model year and engine size to confirm fitment.

Which vehicles and engines does this seal kit fit?

This kit is designed specifically for GM 1.4L and 1.5L turbocharged and naturally aspirated inline-four engines from mid-2010s models. Confirming the engine displacement and part number on your vehicle will avoid misorders.

• 2016–2019 Buick Encore with 1.4L L4 engines
• 2016–2019 Chevrolet Cruze 1.4L L4
• 2018–2020 Chevrolet Equinox 1.5L L4
• 2016–2020 Chevrolet Malibu 1.5L L4
• 2018–2020 GMC Terrain 1.5L L4

What parts are included and how do they match the originals?

The kit supplies injector O-rings and upper/lower seals sized to fit the specified GM injector housings. Each piece is shaped to the common OE profile so technicians can visually compare the supplied parts to the ones removed from the engine before installation.

• Includes lower injector seals and upper O-rings as required for service
• Designed to replicate original dimensions and sealing surfaces
• Visual match recommended — compare pictures and specs to your existing seals

How will installing these seals affect performance and maintenance?

Replacing old, hardened, or leaking injector seals improves fuel system integrity and helps eliminate external leaks and fuel smell. While seals won’t change injector spray pattern, a proper seal prevents vacuum/fuel leaks that can cause rough idle or diagnostic trouble codes.

• Stops external fuel seepage around injectors
• Reduces risk of air entering the intake at injector ports
• Supports consistent engine idle and emissions behavior when seals are the root issue

How do I confirm compatibility before ordering?

Check your vehicle’s model year, engine displacement (1.4L or 1.5L L4), and the part number you’re replacing; our kit carries part number 55577403. When in doubt, remove one injector seal to compare shape and size, or consult a trusted technician.

• Verify part number 55577403 if replacing an existing kit
• Match engine size: 1.4L L4 or 1.5L L4 for listed models
• Compare kit photos and dimensions against your original seals

Who is this for: This AUTO OCCASION injector seal kit is suited for DIY mechanics, professional technicians, and anyone performing fuel injector service on compatible Buick, Chevrolet, or GMC vehicles. It’s useful during injector replacement, intake-plenum removal, or whenever seals show signs of hardening or leakage. Always follow safety procedures when working on fuel systems and replace seals as part of a thorough injector service to ensure a reliable fit and safe operation.