So i ran into some Problems with Refined Fuel.

I need 8 Petroleum Blocks to get 4 Canisters & 8 Buckets of Diesel.
To move on i need 1 Canisters of Diesel to get 1 bucket of Refined Fuel & 50% chance of plastic.

After that processabove i have 1 Canister of Refined Fuel and 1 Canister of Diesel & 6 Buckets of Diesel inside the first Destille.

I know normally you can reuse the Canisters, but in this way the Canister gets eaten up.
So unless you don't have some other sources of plastic, you are stuck in the process convertig 8 Buckets of Diesel into Refined Fuel.

Solution maybe the use of the Buildcraft Refinery to convert Diesel into Refined Fuel.
That way you save the Canisters and you use the pipes to handle the Fluids.

EDIT: Another Solution might be to have an own refinery to refine Diesel and save the Canister.
Another to have its independant source of Plastic else than from the Destille.

Another issue is, what is the benefit, from refining the Diesel?
The Consumption of the Diesel Train is the same with both Fluids...