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Fleetwatch FMS · Fuel Lane Hardware
Fleetwatch Shows Zero or Low Fuel from a Mechanical Dispenser
On a mechanical dispenser, fuel flow turns the Totalizer, and the Totalizer gear drives the mechanical pulser. The pulser generates the pulses Fleetwatch counts. If any part of that chain slips, breaks, or stops turning, Fleetwatch records zero fuel, too little fuel, or missing fuel, even though the dispenser still pumps.
How the Count Reaches Fleetwatch
| Fuel flows through the meter |
→ | Totalizer gear turns |
→ | Mechanical pulser sends pulses |
→ | Fleetwatch counts them |
Overview: the mechanical pulse meter (circled) mounts on the register. The small numbers above “Gallons” are the Totalizer.
Step 1: Watch the Totalizer While Dispensing
Dispense fuel and compare the small Totalizer numbers with the large resettable display under “Gallons.” They should turn smoothly and go up by the same amount.
| What you see | Likely cause and next step |
|---|---|
| Totalizer doesn’t move, moves in jumps and starts, or doesn’t match the resettable display | Totalizer gear Inspect the Totalizer gear for damage (Step 2). A broken gear that stops turning is a common failure, and no pulses are generated. |
| Totalizer works normally and matches the display, but Fleetwatch gets no counts | Mechanical pulser Inspect the mechanical pulser and replace it if needed (Step 4). |
| Fleetwatch gets counts, but they’re low or inconsistent compared with the display | Worn gears or lash Look for worn teeth and check the gear lash at the main counter (Steps 2 and 3). |
⚠ Before opening the dispenser
Turn off power to the dispenser and pump, and follow your site’s fuel-handling safety procedures. Inspection and repair of the register, gears, and pulser should be done by a qualified fuel equipment technician.
Step 2: Inspect the Gears
With the register cover off, look at the gears and mechanisms. If you’re seeing zero fuel, low counting, or missing fuel, look for:
• Broken gears
• Missing teeth
• Worn-out teeth
• Any other mechanical issue, such as a loose, misaligned, or slipping gear
Inside the register: counter wheels, gears, and mechanisms.
Close-up of the gears. Check every tooth.
Step 3: Check the Gear Lash at the Main Counter
Inspect the lash in the gear at the main counter. Make sure it isn’t too loose, and adjust as needed.
What is backlash (lash)?
The slight clearance, or gap, between the teeth of two interlocking gears. A small amount is needed for smooth operation, to prevent binding, and to allow for thermal expansion.
|
Too much lash
Delays in motion, inconsistent performance, excessive wear, and even gear failure. On a register, slipping gears can mean lost or uneven pulses.
|
Too little lash
Binding, increased friction, overheating, and premature wear.
|
| Causes of excessive lash | How to fix or adjust it |
|---|---|
| Wear and tear: gear teeth wear down over time, increasing the gap. | Inspect for wear: check for worn or damaged teeth. |
| Misalignment: improper installation or shifting changes how the gears mesh. | Adjust spacing: some systems allow lash adjustment by repositioning the gears. |
| Loose bearings or shafts: worn mounting parts let gears move out of position. | Replace worn components: if worn gears, bearings, or shafts cause the lash, replacement is the best option. |
| Manufacturing tolerances: some lash is built into the gear design. | Use preload mechanisms: some systems use springs or adjustable mounts to reduce unwanted lash. |
Step 4: Check the Mechanical Pulser
If the Totalizer turns smoothly and the gallons dispensed match the resettable display, but Fleetwatch still receives no counts, the problem is most likely the mechanical pulser.
• Check that the pulser’s drive coupling engages the Totalizer gear and turns with it.
• Check the pulser’s wiring and connections.
• If it still sends no pulses, replace the pulser.
Mechanical pulser and its drive gear.
✔ After any repair, dispense a test amount and confirm the quantity recorded in Fleetwatch matches the dispenser’s resettable display.
Questions about fuel counts in Fleetwatch? Contact Fleetwatch Support.