On-site fleet refuelling is the commercial-operator pattern where the fuel truck comes to the yard or job site. This page absorbs the previously-standalone cards on standby and prime-power generator fueling, volume-contract pricing, DEF storage and shelf life (ISO 22241), and the federal Sulphur in Diesel Fuel Regulations that govern what can be delivered. Section anchors mirror the prior slugs.
Storage:
Contamination risk: Even small contamination from diesel, oil, coolant, tap water, or window-wash chemical destroys SCR catalyst. Dedicated dispensing equipment (no shared funnels/hoses) is mandatory. SCR catalyst replacement: typically $4,000–$10,000+ on heavy-duty trucks.
Consumption ratio: ~2–3% of diesel volume on Class 8 highway tractors; up to ~5% on heavy-duty applications under load. Practical fleet planning: 1 USG DEF per 50 USG diesel.
ISO 22241 — DEF specification (32.5% urea, deionized water). Petro-Canada's marketing notes Air1 is API-certified to ISO 22241.
Off-spec DEF can damage SCR catalysts and trigger engine derate. Storage materials must be DEF-compatible (stainless, certain plastics) — galvanized or copper materials contaminate the fluid.
Federal Sulphur in Diesel Fuel Regulations under the Canadian Environmental Protection Act. ULSD = ≤15 ppm sulfur, mandatory for all on-road diesel since 2006, all off-road/non-road since 2010, locomotive/marine since 2012. All diesel sold in Canada today is ULSD (no LSD remains).
Supply and ongoing fuelling of stand-by and prime-power generators — diesel generators at hospitals, data centres, telecom, agricultural, and commercial sites; propane generators for residential and small commercial. Includes day-tank top-ups, fuel-polishing, and tank inspection.
Generator fuel-oil tanks fall under CSA B139 (specifically B139.1.1 for stationary engines) and O. Reg. 213/01; the B139 Comprehensive Inspection is commonly required for life-safety generators in ICI buildings. Diesel ages — ULSD typically has 6–12 months stable life — making periodic polishing or rotation important.
A negotiated per-litre price tied to a committed annual or seasonal volume, typically expressed as a posted-rack-plus-margin or as a fixed differential to a benchmark (e.g., OPIS Toronto rack). Used by mid-to-large commercial customers.
Commercial supply contracts are covered by general contract law and the Sale of Goods Act (Ontario). HST applies on the price.