Comparing Engine Technologies: Diesel vs. Electric Vacuum Trucks in 2025

As technology evolves and sustainability becomes a driving force in fleet operations, businesses face a critical choice when upgrading or expanding their vacuum truck fleets: diesel or electric? In 2025, both technologies have distinct advantages and trade-offs that impact performance, cost, and environmental sustainability. Whether you operate a large commercial outfit or a small septic service, understanding these differences can help you make the most informed decision for your business.

At KeeVac Industries, we specialize in upfitting vacuum trucks using a wide range of new and used chassis from licensed dealers, including Ford, Chevrolet, Ram, International®, Peterbilt, Freightliner, Mack, Isuzu, and Kenworth. Our vacuum trucks are built to meet your exact specifications, whether you’re looking for a full septic pump truck or one of our popular aluminum slide-in pumper units. Let’s explore the differences between diesel and electric vacuum trucks in depth.

Overview of Diesel and Electric Engine Technologies

Diesel Engines

Diesel vacuum trucks have long been the backbone of industrial waste collection and septic services. Known for their torque, durability, and wide serviceability, diesel engines are a reliable choice for high-demand applications.

Key Benefits of Diesel Engines:

• Strong performance, especially in heavy-duty and off-road conditions
• Widespread fueling infrastructure
• Long history of industry use and technician familiarity
• High torque output for towing and suction tasks

Electric Engines

Electric vacuum trucks represent the next generation of fleet technology. With zero tailpipe emissions and much quieter operation, they are becoming more appealing as environmental regulations tighten and cities push toward electrification.

Key Benefits of Electric Engines:

• Zero tailpipe emissions
• Reduced noise pollution
• Lower operational costs (no fuel, less maintenance)
• Eligibility for state and federal incentives

Electric vehicles (EVs) in the heavy-duty sector are rapidly gaining traction thanks to advances in battery technology and a growing charging infrastructure.

Environmental and Economic Impacts

Impact on Fleet Sustainability

Switching to electric vacuum trucks can dramatically improve your company’s environmental profile.

Electric:

• No greenhouse gas emissions from the tailpipe
• Potential for 100% renewable operation if charged using green energy
• Lower particulate pollution, which is especially important in urban environments

Diesel:

• Advances in emissions control have reduced impact, but still produce NOx and CO2
• More frequent maintenance requirements mean more resource consumption
• Fuel consumption contributes significantly to overall carbon footprint

Electric trucks may be a strategic advantage for companies aiming for sustainability certifications or working in environmentally sensitive areas.

Cost Comparison Over Time

Initial Investment:

• Diesel trucks are still cheaper upfront than electric trucks
• Electric trucks can be more expensive due to battery technology and newer components

Operational Costs:

• Electric vacuum trucks typically cost less to operate: no fuel and fewer mechanical failures
• Diesel engines require regular oil changes, filter replacements, and fuel costs

Maintenance:

• Electric drivetrains have fewer moving parts and require less frequent service
• Diesel engines may last longer in extreme-duty settings but come with higher upkeep

Incentives:

• Electric trucks may qualify for local, state, or federal grants and tax breaks
• Diesel options are typically not eligible for these financial perks

Over a 10- to 15-year lifespan, the total cost of ownership can be lower for electric trucks, especially for operations with consistent routes and access to charging infrastructure.

Future Trends in Vacuum Truck Power Sources

Performance Metrics and Efficiency

In 2025, performance is no longer a one-sided conversation. While diesel engines still dominate in raw power and field-proven ruggedness, electric vacuum trucks are catching up quickly.

Diesel Trucks:

• Better for remote operations where charging stations are unavailable
• Superior towing capacity for extreme loads
• Better suited for continuous 24/7 operation

Electric Trucks:

• Quick torque delivery, great for stop-and-go urban routes
• High energy efficiency: fewer losses in the drivetrain
• Ideal for predictable, short to mid-range daily routes

Battery life and range are improving year over year, making electric trucks viable for an increasing range of applications.

Infrastructure and Charging Considerations

One of the most significant challenges facing electric vacuum trucks is the need for charging infrastructure.

• Charging Times: Fast-charging stations can replenish 80% battery in under 2 hours for most commercial-grade EVs.
• Depot Charging: Many fleet operators install overnight charging stations at their garages.
• Public Infrastructure: Growth in EV infrastructure across the U.S. continues to support electric fleet growth.

Conversely, diesel trucks benefit from a robust and nationwide refueling network that supports long-haul or remote work.

Regulatory and Market Momentum

Federal and state regulations are pushing hard toward lower-emission fleets.

• California’s Advanced Clean Trucks rule requires manufacturers to transition toward zero-emission trucks.
• Other states are adopting similar rules, which will increase demand and availability for electric vacuum trucks.
• Corporate Environmental, Social, and Governance (ESG) goals are incentivizing companies to go electric.

Companies that adopt electric vehicles early are more likely to stay ahead of compliance demands and gain reputational benefits.

Making the Right Choice for Your Operation

So, should you stick with a diesel workhorse or invest in a cutting-edge electric vacuum truck?

Here are a few questions to guide your decision:

• Do you operate in urban environments where noise and emissions are a concern?
• Are your routes predictable and within 100–150 miles daily?
• Do you have access to charging infrastructure?
• Is your company focused on sustainability and ESG reporting?
• Is up-front cost or long-term savings more important to your operation?

Diesel vacuum trucks are tried and true—perfect for rugged terrain, long hauls, and remote job sites.

Electric vacuum trucks are the future of sustainable fleet management. They are ideal for city-based services, regulatory compliance, and lower operational costs.

Why Choose KeeVac Industries?

At KeeVac Industries, we don’t believe in a one-size-fits-all solution. Our mission is to provide you with vacuum truck builds that reflect your specific operational needs, budget, and values.

• We work with new and used chassis from trusted brands like Ford, Ram, International®, Kenworth, and more.
• We offer custom builds, including slide-in aluminum pumper units that fit almost any full-size pickup bed.
• Our Denver-based team delivers unmatched customer service, technical support, and durable construction.
• Whether you want to upgrade your current diesel fleet or explore the possibilities of electric vacuum trucks, we can guide you every step of the way.

Partner with Us Today

Ready to take the next step in modernizing your vacuum truck fleet? Whether you’re curious about electric vacuum trucks or want to continue leveraging diesel power, KeeVac Industries has the expertise, inventory, and passion to get you on the road with confidence.

Contact us today to explore our wide range of septic pump trucks, vacuum tanks, and slide-in pumper units. Let us help you build the truck that works as hard as you do—diesel or electric, we’re here to power your progress!