Pastry Truck Sakharka

In the city of machines, there is its own pastry shop. Its owner, Sakhark, is an unusual small-sized truck. But this doesn't stop him from making the best gasoline cakes and wrench donuts in the city!
Once, Sakhark received an order - to make a cake for the entire port! A gift for an important guest, champion dump truck Strongman. The little truck turned to the big machines for help, but received responses:
- I can't help - I have a delivery!
- I have fuel up!
- I have a body of sand. And someone just said:
- Bye!
How will a little truck manage a big good deed?