You need to note who Owns the vehicles, so that we know how operating costs would be handled. We don't know if fuel is a valid auto expense or not. It could be that you need to track all auto operating costs, or these costs are for personally-owned vehicles, that are Not tracked as auto operating costs.

Fuel used in Equipment would be operating costs, such as Graders and Generators.

And Job Tracking Fuel never makes sense, because the fuel and other consubables are not bought only for a specific job. They are bought when you run low. Even repairing a tire or replacing a belt is part of Maintenance and Operations, not Job Specific. That's why Job Specific is done as Mileage or Operating Hours, given a value, or an allocation of Overhead. Example:

You buy a Fortruck and have an Expected amount of time available for use and a Maintenance and Repair expectation and a Useful Life = you get a rough Per Hour rate that is Job Tracked, not creating any Real Financial data. Actual Costs for maintenance and repair are already part of the P&L, as is the Depreciation allowance from the asset purchase. In these examples, you can allocate a Job Cost without it being a Real Expense.