Unless those drivers lay out money from their own pockets, they're effectively stranded. That really sucks.
It's a huge mess all around. If Arrow doesn't pay their fuel bill, the company that supplies their fleet services is out that money, not just Arrow. Those OOIDA members are not Arrow employees... they're individuals that own their own vehicles and have an agreement to drive for Arrow. If they don't get paid, they're liable for their own fuel costs.