This blog answers common questions about mobile diesel delivery in the Denver metro area. We cover dyed versus clear diesel rules in Colorado, DEF supply, generator refueling, delivery costs, and emergency fuel service for job sites, fleets, and events. It is written by The Fuel Guys, a mobile fueling company based in Denver, drawing on the deliveries we make across the Front Range.
Tank size = daily burn × days between deliveries, plus one day of reserve — then round down toward the nearest threshold. The 60, 660, 1,100 and 1,320-gallon lines, and what each one adds.
It’s a marketing phrase, not a regulated term. What actually decides whether fuel reaches you at 2 a.m.: who answers the phone, whether a loaded truck is staged, and whether a driver still has legal hours.
Passing a load test does not prove your fuel. NFPA 110 requires a monthly 30% run and a separate annual fuel quality test — and the test burns come out of the same tank the code expects to be full.
The engine stops, and it won’t restart the moment fuel arrives — running a tank dry pulls air into the injection system, and the restart is a bleed-and-prime job. Plan on hours, not minutes.
Runtime is usable gallons divided by burn rate at your real load — not one number on a clipboard. Published gal/hr figures from seven gensets, and the math behind a “24-hour tank.”
Shelf life is set by storage temperature, not the calendar: 12 months at 86°F, 6 months at 95°F — and a jug in a hot truck cab is in “test before use” territory by 11 a.m.
Denver police don’t track stolen fuel as its own category — so you can’t manage it from statistics. What Colorado’s theft law, the state tank rules, and your own fuel log actually give you.
Direct-to-equipment fueling versus a tank on site — compared on permits, spill plans, crew time, and what each one really costs a Denver contractor.
A Cat 320 burns 2.4–3.7 gal/hr and idle time drives the spread. Published burn rates for eight Cat models, a rule of thumb for everything else, DEF use, and cost per hour.
Usually yes — most metro fire authorities require a permit above 60 gallons. What OSHA, the fire code, and the EPA each require, and where they disagree.
Most deliveries are the day's market rate per gallon plus a delivery fee. Recent Denver ranges: $3.69–$4.69/gal on-road, $3.09–$4.09/gal dyed, with fees from $0 to around $1,000.