I'll just add to be careful using Marvel Mystery Oil. It doesn't mix with alcohol. If your pump and lines are full of it, when you go to start the car, you may by trying to force a bunch through the nozzles all at one time. If you do get a bunch in the cylinders, then you're just gonna hydraulic the engine and hurt something. Never heard of using gas, either. With a 15:1 engine, I personally wouldn't want anything that detonates easily in the system-even if it is used just for flushing things out. That's my opinion, anyway...