Petrol Pump Stock Not Matching? How to Find and Explain Stock Variance

Sooner or later every pump owner faces it: the stock in the register and the stock in the tank do not match. Petrol pump stock variance is normal in small quantities, and a warning in large ones. The skill is in telling the two apart and finding the reason quickly.

What is stock variance?

Two figures are compared for each tank:

• Expected stock — what should be there according to your records: opening stock + quantity received − quantity sold.
• Physical stock — what is actually there according to the dip reading and the dip chart.

Stock variance = physical stock − expected stock

If physical stock is lower, you have a shortage. If it is higher, you have a gain. Both deserve an explanation.

The usual causes of stock variance

Measurement causes

• Dip reading errors: a tilted rod, a faded mark, or a reading taken while the nozzle was running.
• Wrong dip chart: using the chart of another tank.
• Timing: the meter and the dip were not read at the same time.

Natural causes

• Temperature and evaporation: fuel volume changes with temperature, and petrol in particular evaporates.

Delivery causes

• Short receipt: the quantity received from the tanker was lower than the invoice quantity, but the invoice quantity was added to stock.

Recording causes

• Testing quantity not recorded or not returned to the tank.
• Meter readings entered wrongly.
• Tank-to-tank transfer or internal use not written down.

Equipment and control causes

• Dispenser delivering more or less than the meter shows.
• Leakage from tank or pipeline.
• Pilferage.

How to investigate, step by step

1. Repeat the dip. Take it carefully, twice, with the nozzle of that tank stopped.
2. Check the chart. Make sure the reading was converted with the chart of that tank.
3. Check the arithmetic. Re-calculate the sale from the opening and closing meter readings.
4. Check the deliveries. Was the received quantity or the invoice quantity added to stock?
5. Check testing, internal use and transfers.
6. Look at the pattern. A variance that appears on one day points to an entry or a delivery. A variance that grows a little every day points to equipment or a regular loss.
7. Compare shifts. If the variance follows one shift or one nozzle, you know where to look next.

Why daily comparison matters

If stock is compared once a month, a variance is thirty days old when you see it. Nobody remembers the deliveries, the readings cannot be repeated, and the only thing left is an argument. If it is compared every day, the dip can be repeated the same morning.

How software helps

Sanchay keeps expected stock and physical stock for every tank. Expected stock comes from opening stock, tanker deliveries and meter-based sales. Physical stock comes from the daily dip reading and the dip chart. Stock variance is shown tank-wise, and testing or internal-use quantity and tank-to-tank transfers are recorded as stock movements.

A stock adjustment can require approval, and the user, old value, new value and reason are recorded — so an adjustment explains a variance instead of hiding it. Read more about tank and stock management and the approval and audit trail.

This guide gives general information. For permissible limits and the procedure to follow at your outlet, refer to your oil company and the applicable rules.