EFI Fuel Tanks: Features & Benefits

When embarking on a classic car restoration or upgrade, the fuel system often requires careful consideration. For vehicles transitioning to Electronic Fuel Injection (EFI), the fuel tank is a critical component that needs to meet specific requirements. Unlike older carbureted systems, EFI demands a consistent and pressurised fuel supply. This is where the modern EFI fuel tank comes into play, offering a host of features designed to support this more sophisticated delivery method. Understanding these features is key to ensuring your classic car runs smoothly, efficiently, and reliably on its new EFI setup. This article will delve into the essential characteristics of EFI fuel tanks, explore what to look for when purchasing one, and highlight why upgrading your classic car's fuel tank is a significant step towards optimal performance.

What Makes an EFI Fuel Tank Different?

The primary distinction between a standard carbureted fuel tank and one designed for EFI lies in its internal design and the components it houses. Carbureted systems typically rely on a mechanical fuel pump mounted externally, which draws fuel from the tank and delivers it at low pressure. EFI systems, conversely, require a high-pressure fuel pump, usually located inside the fuel tank (an in-tank pump). This placement offers several advantages, including better fuel cooling, reduced noise, and a more consistent fuel supply. EFI tanks are therefore engineered to accommodate this internal pump and its associated plumbing.

Key Features of EFI Fuel Tanks:

When you're looking for an EFI fuel tank, several features are paramount:

• In-Tank Fuel Pump Mounting Provision: The most crucial feature is a designated space and secure mounting system for an in-tank fuel pump. This often includes a recessed sending unit or a dedicated pump hanger that keeps the pump submerged in fuel, preventing it from running dry and overheating.
• Fuel Level Sender Compatibility: EFI systems require accurate fuel level readings for the engine control unit (ECU) to manage fuel consumption and range estimations. EFI tanks are designed to accommodate modern fuel level senders, which may differ from older, mechanical senders.
• Internal Baffling/Anti-Surge Mechanisms: To ensure a consistent fuel supply to the high-pressure pump, especially during cornering, acceleration, or deceleration, EFI tanks often feature internal baffling or a "surge tank" or "collector box". This design keeps the fuel pump pickup submerged even when the fuel level is low.
• Feed and Return Line Ports: EFI systems typically have a feed line (delivering pressurised fuel to the injectors) and a return line (sending excess fuel back to the tank). EFI tanks will have correctly positioned and appropriately sized ports for these lines.
• Rollover Vent Valve: For safety, EFI tanks are usually equipped with a rollover vent valve that prevents fuel spillage in the event of an accident.
• Material and Durability: While many classic cars originally had steel tanks, modern EFI tanks are often available in materials like stainless steel or aluminium, offering superior corrosion resistance and longevity. Some may even be plastic, which is lightweight and corrosion-proof, though less common for aftermarket classic car applications.

Why Upgrade to an EFI Fuel Tank?

If you're converting a classic car to EFI, a direct swap of your old fuel tank is rarely sufficient. The original tanks were not designed to house a high-pressure pump or manage the return flow of fuel. Attempting to adapt an old tank can lead to several problems:

• Inadequate Fuel Delivery: The lack of internal baffling or a proper pump mounting can cause fuel starvation during spirited driving, leading to misfires and poor performance.
• Overheating the Fuel Pump: Without the cooling effect of being fully submerged and surrounded by fuel, an external or improperly mounted in-tank pump can overheat, reducing its lifespan and potentially causing failure.
• Pressure Fluctuations: The fuel pressure required for EFI is significantly higher than for carburettors. An old tank might not be robust enough to handle these pressures, or its internal design might lead to inconsistent delivery.
• Corrosion and Contamination: Older tanks, especially if made of steel, can suffer from rust and internal debris, which can quickly clog sensitive EFI components like injectors and fuel filters.

An aftermarket EFI fuel tank is specifically engineered to address these issues, providing a reliable and efficient foundation for your EFI system. It ensures that your fuel pump operates optimally, your fuel delivery is consistent, and your system is protected from contamination.

Fuel Pumps & Senders: The Essential Pair

A critical aspect of the EFI fuel tank is its compatibility with the correct fuel pump and sender unit. As mentioned, the pump is typically located within the tank. When selecting an EFI tank, it's vital to ensure it's designed to accept the specific pump you intend to use, or that it comes as a complete kit with a compatible pump and sender.

Companies like Tank's, Inc. specialise in producing high-quality fuel tanks for classic vehicles, including those designed for EFI conversions. They offer tanks specifically designed for popular models such as the 1967-1981 Firebird, 1964-1972 GTO and LeMans, and 1971-1979 Ventura. Crucially, Tank's, Inc. also provides in-tank fuel pumps and senders that are engineered to work seamlessly with their tanks. This integrated approach simplifies the conversion process and guarantees component compatibility. For further information or to discuss your specific needs, Tank's, Inc. can be contacted at 877-596-3842.

Choosing the Right EFI Tank and Components:

When making your selection, consider the following:

• Vehicle Application: Ensure the tank is designed for your specific make, model, and year.
• Pump Type: Verify that the tank can accommodate your chosen fuel pump (e.g., specific brands or flow rates).
• Sender Unit: Confirm that the tank is compatible with a suitable fuel level sender for your EFI system. Some tanks come with a pre-installed sender, while others require you to purchase one separately.
• Material: Decide between steel, stainless steel, or aluminium based on your budget, desired longevity, and corrosion resistance needs.
• Capacity: Ensure the tank capacity is suitable for your engine's fuel requirements.

Table: Standard Carbureted Tank vs. EFI Fuel Tank

Here's a quick comparison highlighting the key differences:

Frequently Asked Questions (FAQs):

Q1: Can I use my original fuel tank with an EFI conversion?
It's generally not recommended. Original tanks are not designed for the high pressures and specific plumbing requirements of EFI systems. You risk poor performance, pump damage, and potential safety issues.

Q2: What PSI does an EFI fuel pump typically run at?
Most EFI systems operate with fuel pressures ranging from 30 to 60 PSI, depending on the specific system and injectors used.

Q3: Do I need a fuel return line with EFI?
Yes, most EFI systems require a fuel return line to recirculate excess fuel back to the tank, helping to maintain consistent fuel pressure and cool the fuel.

Q4: What are the benefits of an in-tank fuel pump?
In-tank pumps offer better fuel cooling, quieter operation, a more consistent fuel supply, and a cleaner installation compared to external pumps.

Q5: Where can I find EFI fuel tanks for my classic car?
Specialty automotive parts suppliers like Tank's, Inc. offer a wide range of EFI-specific fuel tanks for various classic vehicles.

Conclusion

Upgrading to an EFI fuel tank is an essential step when converting a classic vehicle to electronic fuel injection. These tanks are specifically engineered with features like in-tank pump provisions, internal baffling, and appropriate line connections to ensure the reliable and efficient operation of your EFI system. By investing in a quality EFI fuel tank and compatible components, you are laying a solid foundation for improved performance, better fuel economy, and enhanced drivability for your cherished classic car. Always consult with specialists or reputable manufacturers to ensure you select the correct tank and components for your specific project.