Cadillac DeVille 1975-1980 Fuel Injector Replacement Guide
Keep your classic DeVille's optional fuel injection system running strong with the right new parts.
- First, confirm your DeVille has the optional Electronic Fuel Injection (EFI), as most were carbureted.
- It is strongly recommended to replace all eight injectors as a set for balanced performance.
- Stick to reputable aftermarket brands like ACDelco or Standard Ignition; avoid unbranded, cheap online parts.
- The 1975-1979 models use a different type of injector than the 1980 models.
Is Your DeVille Fuel Injected?
Before buying parts, you must confirm your car has fuel injection. Most DeVilles from 1975-1980 came with a carburetor. Fuel injection was a rare and expensive option. Check your engine bay. If you have a large, round air cleaner housing sitting on top of a metal bowl with various linkages, you likely have a carburetor. If you have a fuel rail (a metal pipe) with individual lines or wires going to each cylinder, you have fuel injection. The 1975-1979 models used a multi-port injection system, while 1980 saw the introduction of a throttle-body injection system, which looks different. This guide focuses on the 1975-1979 multi-port style.
Common Symptoms of a Bad Fuel Injector
These early EFI systems can be sensitive. A failing injector can cause noticeable problems.
- Rough Engine Idle: The engine may shake or run unevenly when stopped.
- Engine Misfires: You might feel a stutter or hesitation during acceleration.
- Poor Starting: The car may be hard to start, especially when the engine is hot.
- Reduced Fuel Economy: A leaking or clogged injector can waste gas.
- Stalling: The engine may unexpectedly shut off.
- Gasoline Smell: A strong fuel smell under the hood could be a leaking injector O-ring.
Pro Tip: Replace as a Full Set
It is highly recommended to replace all eight fuel injectors at the same time. Since they have all aged together, if one fails, others are likely to follow. Replacing them as a set ensures each cylinder gets the same amount of fuel, leading to a smooth, balanced engine.
Choosing the Right Aftermarket Injector
For a classic vehicle, part selection is key. The original Bendix-style injectors are long out of production. New aftermarket parts are made with modern materials and technology, which can offer better reliability.
ACDelco: As General Motors' own parts brand, ACDelco is the closest you can get to original equipment quality. They are often the preferred choice for critical parts on GM vehicles to ensure compatibility. While sometimes more expensive, they are a trusted, reliable option.
Standard Ignition (SMP): Standard is a well-respected aftermarket brand that has been around for decades. They produce high-quality electronic components that meet or exceed original specifications. For many professional mechanics, SMP is a go-to brand when an original part is unavailable.
A Warning on "Too-Good-To-Be-True" Pricing
Be cautious of extremely cheap, unbranded fuel injectors found on some online marketplaces. These are often low-quality copies that can fail quickly, perform poorly, or even leak fuel, creating a fire hazard. Stick with reputable brands like ACDelco or Standard Ignition from a trusted seller.
Estimated Replacement Costs
| Part Type | Estimated Cost (Set of 8) |
|---|---|
| New Aftermarket (ACDelco, Standard) | $680 - $750 |
| Remanufactured OEM | $200 - $400 |
| Shop Labor | $200 - $450 |
Cost estimates are for parts and labor and can vary by location and vehicle condition.
Frequently Asked Questions (FAQ)
Do I need special tools to replace a fuel injector?
Basic hand tools like a socket set and pliers are needed. A fuel line disconnect tool may be helpful. Most importantly, have a fire extinguisher nearby and work in a well-ventilated area. Relieving fuel pressure before you start is a critical safety step.
Can I clean my old injectors instead of replacing them?
You can try fuel injector cleaning additives, but they rarely fix a failed injector. Professional off-car cleaning and flow testing is an option and can be effective. However, for a 45+ year old electronic part, replacement with a new unit often provides more peace of mind and reliability.
What are the most common mistakes when ordering?
The biggest mistake is ordering fuel injectors for a carbureted car. You must verify you have the optional EFI system. Also, be aware that 1980 models used a different throttle-body injection system, which uses different injectors than the 1975-1979 multi-port system.
Are there any recalls on this part?
There are no active or recent safety recalls for the fuel injectors on the 1975-1980 Cadillac DeVille. Any original service campaigns or recalls from the 1970s would have long since expired.
Technical Specifications
This is a top-feed, multi-port fuel injector for use with the Bendix-based Electronic Fuel Injection system. It features a rectangular electrical connector. Always verify the connector shape on your vehicle before ordering.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.