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Most businesses know exactly what they paid for diesel. Far fewer can say where every litre went once it hit the site.
If you can't track diesel usage at the tank, that gap costs more than it looks, because diesel doesn't leave a tank slowly.
The maths nobody does at the pump
Take a small transfer pump running at 40 litres a minute. At $2.10 a litre, that pump moves $84 of fuel every minute it's running. A slightly faster pump or a higher price and you're at $100 a minute.
That isn't a worst case. That's a normal pump on a normal site.
Now count your tanks. A mid-size civil business might run 20. A bigger one might run 40. That's 20 or 40 pumps, each able to move money at that rate, spread across sites you can't watch in person.
That isn't really a fuel problem. It's a cash flow problem dressed up as one. And you can't manage it unless you can track diesel usage at the point it leaves the tank.
Fuel theft is real, and it's expensive
Fuel theft is the part that gets the headlines. Earthmovers & Civil Contractor magazine reports that construction businesses lose around $95 million a year to fuel-related theft, citing Australian Federal Police figures.
That's syphoning from machine tanks, night-time drains at depots, and fuelled-up plant left on remote sites. If you've got unlocked tanks and a site with 24-hour access and plenty of contractors coming and going, you're a target whether you've noticed or not.
Theft usually isn't the real problem
Here's what surprises most plant managers. When fuel numbers don't add up, theft is rarely the whole story.
More often, nobody has a clean record of what happened.
A supplier invoice proves diesel was delivered. It proves nothing about which machine it went into, who pumped it, which job it belongs to, or whether the litres match the work done. That gap between "fuel bought" and "fuel accounted for" is where the real cost hides.
It shows up as:
- Jobs costed on guesses instead of actual litres
- Fuel tax credits rounded down because nobody can prove the real figure
- Hours lost each month matching paper logs against invoices
- Arguments with subcontractors over free-issued fuel, with no record either side trusts
- Tanks running dry mid-job because nobody saw the drawdown coming
None of that needs a thief. It just needs nobody watching.
Why it costs more the longer it runs
Run the numbers on a civil operation using 20,000 litres of diesel a month. At $2.10 a litre, that's $42,000 a month, or $504,000 a year.
If just 3% of that can't be accounted for, that's more than $15,000 a year leaving the business with no job code, no explanation and no way to claim it back. Scale that across 40 tanks and it stops being a rounding error.
Plug your own litres and price into those sums. The result is usually bigger than people expect.
How to track diesel usage without paperwork
The fix doesn't start with chasing down who took what. It starts with diesel fuel tracking that happens by itself.
With Fuellox, the operator scans a QR code on the machine, pumps and gets back to work. The system records the operator, the asset, the litres, the time, the GPS location and the project. That's everything a paper logbook is meant to capture, without the handwriting, the lost pages or the four-hour month-end scramble.
The record exists the moment the nozzle goes back on the hook. You find out something is wrong today, not three weeks later. And because every litre is tagged to a job, job costing is based on real numbers.
It works on portable pods, static tanks, trailers, ute-mounted tanks and service trucks. Fuellox runs on Bluetooth through the operator's phone, so it keeps working on sites with no signal.
The question worth asking on your own site
Could you explain where yesterday's diesel went, machine by machine, right now, without digging through paperwork?
If the honest answer is no, that isn't a reflection on your team. It's a blind spot in the system they've been given. And every day it stays open, the pump keeps moving money.
See what your sites are losing
Get the free Diesel Visibility Guide, or see how the Fuellox fuel management system works end to end. If you want to see it on your own tanks, book a free demo and we'll walk you through it in about 10 minutes. There's more on fuel management for civil construction, the four causes of fuel loss on construction sites, and fuel job costing.
Frequently asked questions
How do I track diesel usage on a construction site?
Record every fill at the tank, not afterwards. A fuel management system like Fuellox logs the operator, machine, litres, time, location and job each time fuel is pumped. That gives you diesel usage by machine and by project, and a record you can trust, without anyone filling in a paper logbook.
How much diesel does a transfer pump move per minute?
Small transfer pumps commonly run at around 40 to 60 litres a minute. At $2.10 a litre, a 40 litre a minute pump moves about $84 of diesel every minute it runs. Across 20 or 40 tanks, that's a lot of money moving with no record of where it went.
Is fuel theft the main cause of missing diesel?
Not usually. Theft is a real cost, but most unexplained diesel comes from poor records: fills that aren't logged, fuel charged to the wrong job, subbie fills nobody wrote down, and small leaks. Recording every fill at the tank shows you which of these is happening on your sites.
