Parked-truck fuel watch

How fleets watch for diesel theft when trucks are parked

Flow monitors fuel level on parked trucks and alerts dispatch when the tank drops without a matching fuel card fill. It is part of diesel fuel optimization for trucking fleets, not a separate camera product. You still run the discounts you already negotiated. You also get eyes on the tank when the truck is sitting still.

Built for dispatch and ops. Book a demo at https://valverideflow.com/contact

Updated September 2026 · 4-minute read

What it does

Four steps, all on data Flow already has for fuel planning. The output is a review queue for dispatch.

Reads the tank the ELD already reports

Fuel level comes off the same ELD or telematics feed Flow already uses to plan fuel stops
Nothing new is installed on the truck and no one has to log a reading

Notices a drop while the truck is not moving

A tank that falls while the truck stays put did not drive that fuel away
Position is the parked signal, so a truck that left and came back is treated as moved, not parked

Checks the drop against a card fill

A drop that lines up with a fuel card fill has an ordinary explanation and stays out of the queue
A drop with no matching fill is the one dispatch gets asked to look at

Hands dispatch a place to look

The finding shows the truck, the window it happened in, and the size of the drop
It sits next to Anomaly Watch, the review queue for fuel card transactions, so one screen covers both

What it is not

Saying this plainly matters more here than on most pages, because a tool that treats drivers as suspects is how these programs die.

Not a camera, a cap lock, or a yard security system

Flow reads a number the ELD already sends. It does not watch the lot, and it does not replace physical security where you need it

Not an accusation

A drop can be a sensor artifact, a long idle, or a fill recorded somewhere else. The queue is a short list of things worth understanding, and most of them resolve in a minute

Not a separate product

It is part of diesel fuel optimization for trucking fleets. The discounts you negotiated, the plan on every dispatch, and the replanning as the truck moves stay the product

Not coverage Flow cannot see

A truck whose ELD does not report fuel level is not watched, and Flow says so rather than guessing. Coverage follows the fuel feed

Who it is for

Any fleet whose trucks spend nights away from the yard and whose ELD reports fuel level.

Fleets whose trucks sit overnight

Ten-hour breaks at truck stops, weekend layovers mid-load, trailers parked at a shipper until Monday. The tank is a target whenever the truck is still

Fleets already on an ELD that reports fuel level

If your telematics sends a fuel level with the position, the watch runs on data you already have. There is nothing to install

Owners who want an answer, not an investigation

The question is usually who is draining my trucks overnight. The useful output is a short list to check, not a suspicion about every driver

Questions, answered

Parked-truck fuel theft, explained.

How do fleets detect diesel theft from parked trucks?

By watching the tank while the truck is not moving. Flow monitors fuel level on parked trucks and alerts dispatch when the tank drops without a matching fuel card fill. It is part of diesel fuel optimization for trucking fleets, not a separate camera product. You still run the discounts you already negotiated. You also get eyes on the tank when the truck is sitting still.

Can fuel optimization software watch tank levels when a truck is parked?

Yes, when it reads fuel level from the ELD. ValveRide Flow already pulls fuel level with each position to build and replan fuel plans, so the same feed shows a tank that drops while the truck stays put. When that drop has no matching fuel card fill, Flow surfaces it for dispatch to review. It is part of fuel optimization rather than a separate tool, and it only covers trucks whose telematics report fuel level.

What is the difference between fuel card anomaly detection and parked-tank alerts?

Fuel card anomaly detection looks at transactions: overfills, impossible distances between fills, double swipes, after-hours purchases, and fills with no load assigned. It finds misuse of the card. A parked-tank alert looks at the tank itself when no transaction exists: fuel level fell, the truck did not move, and no card fill explains it. It finds fuel leaving the truck. Flow runs both as review queues, side by side, and neither one is an accusation.

Can Flow watch for fuel theft when a truck is parked?

Yes. Flow reads fuel level from the ELD. When a tank drops while the truck is parked and there is no matching fuel card fill, we surface it for review. That sits next to Anomaly Watch on fuel card transactions (overfills, double swipes, after-hours, and related patterns). Both are review queues, not automatic accusations.

Next step: book a demo.

Bring your ELD and your fuel card setup. We will show you the parked-truck watch next to the fuel plan work Flow already does, on your own trucks.

Book a demo →See how Flow works