The following tests are performed annually by Weights & Measures inspectors on gas stations in the City of Madison. The tests protect consumers and vendors by ensuring accuracy and reliability of equipment.
1. Verify that consumers can see posted gas prices from the road. Prices for all grades/types of fuel must be posted.
2. Verify pricing and labeling. Prices on street signs and pumps must match. Money calculation on pumps will be check. All device displays must be working and readable. Burnt out segments must be fixed. Other device components must work including printers and keypads.
Octane and Ethanol labeling must be accurate.
3. Verify accuracy of the pumps. Five gallons of fuel will be tested (with a state metrology-lab-certified measure) to ensure the device is delivering within a set tolerance. Pumps that are under-delivering beyond a set tolerance must be recalibrated to zero. Tolerances are determined using Handbook 44.
4. Check for leaks in the dispensers, hoses and nozzles.
6. Verify valve operation. The nozzle's anti-drain valve and auto-shutoff valve must work properly.
During meter jump the customer activates the dispenser but before any fuel is dispensed, an amount pops up on the display. Dispensers are a wet hose system and if there is a fuel leak the dispenser must refill the hose before the customer can pump fuel. The customer should not have to pay for the fuel that is metered to fill the hose since they did not get the fuel.
After dispensing fuel the nozzle clicks off, but the dispenser continues to add cents onto the gas purchase even though gas is not flowing.