If you run methanol and your trying to preheat things you might consider a primer plus system. I run methanol, I have a pan heater as well as a 2 block heaters. I dont use them any more.I really like the primer plus system as it saves a TON of fuel and I can drive the car around the pits using it. I built my own, but you can purchase them from Rons Fuel injection. Yes I use it under my carb.