Is there's a equation to see what LPH pump I need? I'm looking at running Haltech RE with probably 1000cc injectors. I'm not planning on going crazy with HP or boost. Do I really need to spend several hundred on a pump or just a standard 255 lph good?

Thx

 

Ive had good luck with the waboro pumps.

 

What's your power goal? There are tons of pump options these days. Drop in Walbro 450lph e85 rated pumps are stupid cheap these days, amazon has them for $75 right now.

 

You have a lot of option, you don't need to spend hundreds $$ for one. You can make 350-400 with one pump even. Search around there is plenty info on this.

 

It depends on the composition and temperature of the fuel, but here is the generic equation:
LPH = ((Horsepower * BSFC) / 1.585)

However, there are more factors such as pressure and voltage. See here:
https://www.aeromotiveinc.com/fuel-p...nd-horsepower/

I like the Aeromotive Power Planner because it includes everything, including the size of the plumbing. It isn't optimized for rotary engines, but it should be pretty close, and you can always go one step larger if you are concerned about running out of fuel.
http://aeromotiveinc.com/wp-content/...EFIsystems.pdf