While I do not own a trucking company, I checked the federal DOT regulations that apply to over the road trucking and found no such law either. There is a law of contract that states if you spend money for your employer they must reimburse you for those expenses upon proof of proper receipts, but there is no specific law in a code, which is why you have read the FMC Act and could not find it. Whenever an employee spends money for the employer, they are entitled to reimbursement. Even the DOT regulations do not say what you claim and I have been through those as well.
You have said you have read the regs and couldn't find it, the reason being is that an actual law does not exist. You are entitled to reimbursement, but is not under a specific law, it is under the contract and general rules of obligations.
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