Fuel Cards / Controls
Fuel Controls in trucking
Plain-English explanation
Fuel controls are the restrictions programmed into a commercial fuel card account that limit how, when, where, and what drivers can purchase. Controls protect the carrier from unauthorized purchases, fraudulent transactions, and over-fueling, while still allowing legitimate operational fueling. Common fuel controls: - Product restrictions: limit the card to diesel only, blocking gasoline, premium diesel, oil, DEF (if tracked separately), and non-fuel merchandise - Gallon limits: cap per-transaction or per-day gallon purchases to the realistic tank capacity of the vehicle - Location controls: restrict fueling to specific networks, regions, or individual stations - Driver PIN requirements: each driver enters a personal identification number, enabling per-driver transaction tracking - Time window controls: limit purchasing to operating hours (e.g., no transactions between midnight and 4:00 a.m.) - Odometer prompts: require odometer entry at each transaction for MPG tracking - Vehicle-level controls: link specific cards to specific trucks to prevent cross-vehicle use Controls need to be calibrated to actual operations. Controls set too tight -- gallon limits below the truck's tank capacity, location restrictions that exclude stops along the truck's routes -- block legitimate purchases and create driver frustration. Controls set too loose provide minimal fraud prevention. When a control blocks a legitimate purchase, dispatch needs to be able to authorize exceptions or temporarily lift a restriction -- most fuel card programs provide a phone or portal method for real-time exception handling.
Fuel card language should be checked against the pump receipt, card controls, discount method, network location, and statement. The advertised discount is not the whole calculation.
Why it matters in trucking
Fuel controls are one of the most underutilized tools in small carrier operations. Owner-operators who set up a fuel card with no controls and later discover a driver or someone who found the card number ran unauthorized purchases learn this the hard way. Basic controls -- diesel only, gallon limit at tank capacity, driver PIN -- cost nothing to set up and prevent most common fuel card fraud.
Fuel choices add up quickly. A route with a cheaper network price can still be the wrong call if it burns time, adds empty miles, or conflicts with card controls.
Example in real use
A small fleet sets up fuel controls for their five trucks: diesel only (no gasoline), 150-gallon per-transaction limit (tank capacity is 125 gallons -- a 20% buffer), driver PIN required, odometer prompt required. Three months later, the fuel card reporting shows one truck with consistently lower MPG than the others. The fleet manager examines the odometer entries -- one driver's entries are implausibly high, suggesting they entered false odometer numbers to mask how often they were fueling. The odometer prompt did not prevent the fraud but made it detectable.
Common mistakes or confusion
- Setting gallon limits exactly at tank capacity with no buffer -- a cold tank can take slightly more than nominal capacity; a 5-10% buffer prevents legitimate fill-ups from being blocked.
- Not assigning individual driver PINs -- without per-driver PINs, a lost card or an unauthorized user can make purchases without any identification trail.
- Applying the same controls to all vehicles when trucks in the fleet have different tanks or operational patterns -- a reefer truck that fuels reefer fuel separately from the tractor needs different controls than a dry van.
Related terms
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Last updated: 2026-05-08