GM 84878518 Fuel Tank
( Brand: Gm ), ( Manufacturer Part Number: 84878518 ), ( Part Type: Fuel Tank ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Parts Included: Only Part Reference 1 On The Diagram Is Included ), ( Replaces Part Number: 84565942 )
Review GM Genuine Fuel Tank
The **GM 84878518 Fuel Tank** is a high-performance, durable, and precision-engineered component designed exclusively for General Motors (GM) vehicles, ensuring optimal fuel efficiency, reliability, and longevity. Crafted from high-grade, corrosion-resistant materials typically a reinforced thermoplastic or high-density polyethylene this fuel tank is engineered to withstand the demands of modern automotive systems while maintaining structural integrity under varying environmental conditions. Its sleek, aerodynamic design minimizes turbulence and reduces fuel sloshing, which helps improve engine performance and fuel economy, particularly during aggressive driving or sharp turns. The tank features a robust, leak-proof construction with precision-molded seams and reinforced welds, ensuring it remains secure even under extreme vibrations or road impacts. Inside, the tank incorporates a sophisticated internal baffling system that prevents fuel surging, reducing the risk of fuel starvation during rapid acceleration or deceleration, thereby enhancing overall drivability. Compatible with a wide range of GM applications, including select models from the Chevrolet, Buick, GMC, and Cadillac lines, this fuel tank is meticulously calibrated to meet or exceed OEM specifications, guaranteeing a seamless fit and reliable operation. Whether installed in a high-mileage vehicle or a newly restored classic, the GM 84878518 Fuel Tank delivers uncompromising durability, ensuring that drivers can rely on consistent fuel delivery without the risk of leaks, cracks, or performance disruptions. Its compatibility with modern fuel injection systems and advanced emissions controls also makes it an ideal upgrade for vehicles requiring enhanced fuel system efficiency or those undergoing performance modifications. Built to last, this tank exemplifies GM s commitment to quality engineering, providing automotive enthusiasts and fleet operators with a dependable solution for maintaining peak vehicle performance and fuel system integrity.
### **Pros and Cons of Buying a GM 84878518 Fuel Tank**
The **GM 84878518** is a fuel tank commonly used in General Motors vehicles, particularly in older models like the Chevrolet Silverado, GMC Sierra, and some SUVs. Below is a detailed analysis of its advantages and disadvantages.
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### **Pros**
1. **Compatibility and Availability**
- This fuel tank is designed specifically for GM vehicles, ensuring a proper fit without modifications. It is widely used in older trucks and SUVs, making it easy to find in the aftermarket.
- Many GM dealerships and auto parts stores carry this part, reducing the risk of ordering a non-standard or counterfeit replacement.
2. **Durability and Build Quality**
- GM fuel tanks from this era (typically late 1990s to early 2000s) were constructed with steel, which is generally more durable than modern aluminum tanks. Steel resists punctures and dents better in high-impact situations.
- The tank is designed to meet federal fuel system standards, including proper venting and sealing, reducing the risk of leaks or fuel vapor buildup.
3. **Cost-Effective Replacement**
- Compared to OEM (Original Equipment Manufacturer) parts from newer GM models, this tank is often more affordable. It can be a budget-friendly option for restoring or repairing older vehicles.
- Pricing varies, but it typically falls within a reasonable range for a used or refurbished part, especially if purchased from a reputable supplier.
4. **Ease of Installation**
- Since it is a standard GM part, installation generally requires minimal modifications. Most mechanics familiar with GM fuel systems can replace it without difficulty.
- The tank includes necessary mounting brackets and connections, simplifying the process compared to aftermarket alternatives that may require additional adapters.
5. **Long-Term Reliability (If Maintained Properly)**
- With regular inspections and preventive maintenance (e.g., checking for rust, ensuring proper grounding, and using fuel stabilizers), this tank can last for many years without major issues.
- Unlike plastic or aluminum tanks, steel is less prone to cracking from temperature fluctuations or road debris.
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### **Cons**
1. **Rust and Corrosion Risks**
- Steel fuel tanks are susceptible to rust, especially in vehicles exposed to harsh weather, salted roads, or poor fuel quality. Over time, rust can weaken the tank, leading to leaks or failures.
- Older tanks may already have rust damage, requiring additional inspection or cleaning before installation. A rusted tank can fail unexpectedly, posing a fire or fuel contamination risk.
2. **Weight**
- Steel tanks are heavier than modern aluminum or plastic alternatives. This can make installation more physically demanding and may require additional labor or equipment (e.g., hoists or ramps).
- The added weight could also impact fuel efficiency slightly, though the difference is usually negligible in most vehicles.
3. **Potential for Counterfeit or Low-Quality Parts**
- Due to the tank s age and popularity, there is a risk of purchasing a counterfeit or refurbished part that hasn t been properly inspected or repaired. Low-quality tanks may have welds that fail or internal corrosion that isn t visible.
- Always verify the source (e.g., reputable dealers, certified refurbishers, or OEM suppliers) to avoid subpar replacements.
4. **Limited Lifespan Compared to Modern Tanks**
- While durable, steel fuel tanks have a finite lifespan, especially in vehicles driven frequently or in harsh conditions. Modern GM vehicles often use aluminum tanks, which are lighter and less prone to rust but may not be as robust in extreme cases.
- If the original tank has been in service for 20 years, it may be nearing the end of its useful life, requiring proactive replacement.
5. **Environmental and Safety Concerns**
- Steel tanks, if damaged or improperly disposed of, can contribute to environmental pollution (e.g., rusted tanks left in landfills). Proper recycling or disposal is necessary.
- Fuel leaks from a failing tank pose a fire hazard and can contaminate soil or water. Regular inspections are critical to prevent accidents.
6. **Compatibility with Modern Fuel Systems**
- Some newer vehicles or modified fuel systems (e.g., direct injection, turbocharged engines) may not fully benefit from an older steel tank. While the tank itself will work, compatibility with modern fuel additives or emissions systems should be confirmed.
- In rare cases, the tank s design may not align perfectly with updated GM fuel system requirements, though this is uncommon for this specific part.
7. **Limited Warranty or Guarantee**
- Unlike new OEM parts, used or refurbished tanks often come with minimal or no warranty. If the tank fails shortly after installation, the buyer may bear the cost of replacement.
- Purchasing from a dealer or supplier with a warranty can mitigate this risk but may increase the upfront cost.
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### **Conclusion**
The **GM 84878518 fuel tank** is a practical and widely available replacement for older GM vehicles, offering durability and compatibility. Its steel construction provides robustness against punctures and dents, making it a reliable choice for trucks and SUVs that see heavy use. The part s affordability and ease of installation further enhance its appeal for DIYers and mechanics alike.
However, the primary drawbacks rust susceptibility, weight, and the risk of counterfeit parts must be carefully considered. Rust can compromise the tank s integrity over time, and improper sourcing may lead to premature failure. For vehicles in good condition with minimal rust exposure, this tank is an excellent option. For older or high-mileage vehicles, additional inspections (e.g., ultrasonic testing for rust) or opting for a newer aluminum tank may be advisable.
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### **Recommendation**
1. **Verify the Condition of the Tank**
- If replacing an existing tank, inspect it for rust, dents, or leaks before purchasing a new one. A professional mechanic can assess whether the tank is salvageable or needs immediate replacement.
- If buying a used/refurbished tank, request documentation or a visual inspection from the seller to confirm its integrity.
2. **Source from a Reputable Supplier**
- Purchase from authorized GM dealers, certified auto parts retailers (e.g., RockAuto, AutoZone with OEM parts), or trusted refurbishers. Avoid unknown sellers who may provide counterfeit or damaged parts.
- Consider buying a **new OEM or high-quality aftermarket part** if budget allows, as it eliminates rust concerns and includes warranties.
3. **Prioritize Maintenance**
- Use fuel stabilizers (e.g., Sta-Bil) to prevent fuel degradation, which can corrode the tank over time.
- Regularly check for fuel leaks, rust, and proper grounding of the tank to extend its lifespan.
- If the vehicle is driven in salty or corrosive environments, consider adding a rust inhibitor to the fuel system.
4. **Weigh the Long-Term Costs**
- While the upfront cost of the GM 84878518 is low, factor in potential future repairs if the tank develops rust or leaks. In some cases, upgrading to a newer aluminum tank (if compatible) may prove more cost-effective over time.
- For high-mileage or older vehicles, weigh whether the tank s remaining lifespan justifies the replacement cost versus other options (e.g., keeping the original tank if it s still functional).
5. **Consider Professional Installation**
- If unsure about installation, hire a certified mechanic to ensure proper sealing, grounding, and connection of the tank. Improper installation can lead to leaks or electrical issues.
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**Final Verdict:**The **GM 84878518 fuel tank** is a **strong choice for older GM vehicles** where compatibility and durability are priorities, provided the tank is sourced carefully and maintained properly. For vehicles with significant rust or in high-risk environments, a newer or higher-quality tank may be the safer long-term investment. Always balance cost, reliability, and safety when making the decision.
Details:
Found a Better Price. Just Didn't Like it. Changed My Mind.
part #: 84878518 price
- $181.50
specifications fueltanksysteme:
- brand: Gm
- mpn: 84878518
- part type: Fuel Tank
- genuine oem: Yes
- manufacturer warranty: 1 Year
- fitment type: Direct Replacement
- parts included: Only Part Reference 1 On The Diagram Is Included
- replaces part number: 84565942
returns fueltanksysteme:
- time: 30 Days
- policy: Returns Accepted
- paid by: Seller
seller fueltanksysteme:
- city: Garland, Texas
- # reviews: 29500
- rating: 99.0%
shipping fueltanksysteme:
- transit: 4-10 Days
- class: Standard
- type: Fixed
- service: FedEx Ground / FedEx Home Delivery
- carrier: FedEx
- cost: $0.00
payments fueltanksysteme:
- credit card: Diners-club
- other
- wallet: Apple-pay
offer fueltanksysteme:
- started: March 16, 2026
- availability: In Stock
- options: Ship-to-home
- sold: 0
- quantity: 2
general fueltanksysteme:
- Car Truck Parts Accessories > Air Fuel Delivery > Fuel Tanks Filler Necks
- condition: New
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