One of the first questions every van builder asks us: should I go diesel or gasoline for my onboard generator? It’s a fair question, and the answer depends on your specific build, budget, and how you plan to use your van. Here’s an honest comparison from our experience as an authorized PowerTech dealer.
Diesel Generators: The Pros
Single fuel system. If you’re driving a Sprinter (which runs on diesel), having a diesel generator means one fuel type for everything. No carrying separate gasoline containers, no worrying about gas going stale, no extra fire risk from a second fuel. Your generator draws from the same tank as your engine — it doesn’t get simpler than that.
Fuel efficiency. Diesel generators produce more energy per gallon of fuel than gasoline equivalents. A PowerTech PT-8KSiC running at 50% load burns roughly 0.4 gallons per hour. Over a full day of intermittent use, that might be 2-3 gallons — barely noticeable in a Sprinter’s 24.5-gallon tank.
Longevity. Diesel engines are built for the long haul. Where a gasoline generator might last 2,000-3,000 hours before needing major work, a quality diesel unit can go 10,000-20,000+ hours. For a van you plan to keep for a decade, that math works out significantly in diesel’s favor.
Torque and load handling. Diesel generators handle variable loads and startup surges better than gasoline units. When your AC compressor kicks on and draws a momentary spike, a diesel generator barely flinches.
Gasoline Generators: The Pros
Lower upfront cost. Gasoline generators are typically 30-40% less expensive than comparable diesel units. The PowerTech PTH-9 gasoline generator offers 9kW of power at a lower price point than the diesel lineup, making it accessible for budget-conscious builders.
Lighter weight. Gas generators weigh less than diesel equivalents, which matters when you’re trying to stay under the Sprinter’s GVWR. Every pound counts in a van build.
Simpler cold-weather starting. Gasoline engines generally start more easily in extreme cold compared to diesel, though modern diesel generators with glow plugs have largely closed this gap.
Our Recommendation
For Sprinter van builds, we generally recommend diesel — the single-fuel advantage alone is worth it, and the long-term durability makes the higher upfront cost a better value over time. For gasoline-powered vehicles like Ford Transits or RAM ProMasters, a gasoline generator makes perfect sense since you’re already carrying gas.
The best choice is the one that matches your vehicle, your budget, and your build goals. Email us with your build specs and we’ll help you figure out exactly which PowerTech model fits your setup.