rmartingt
Well Known Member
I'm still a long way off from an engine purchase (almost to sealing my first fuel tank), but I've decided to use ethanol-compatible fuel injection, and am trying to gather information now so I make sure to build the tanks correctly.
1a. My understanding is than an EFI system has individual injectors on each intake, and the injector delivers a timed "pulse" of fuel basically coinciding with the intake valve being open. So, when the valve is closed, no fuel is being delivered. Right?
1b. With other injection systems, does the injector deliver a constant stream of fuel to each intake? I assume the fuel is metered at one point, with each injector balanced with restrictors, etc.?
2. When does the decision on which system to use need to be made? By engine purchase? After engine purchase but before FWF install?
3. Is there any downside to fitting the tanks for return lines and capping them if not needed?
4. If my eventual engine/injector combo doesn't need a full-time return line, is there a downside to running a purge to one side, using dual wing root pumps with check valves, and eliminating a selector valve? I'm figuring on probably dropping the mechanical pump anyway...
1a. My understanding is than an EFI system has individual injectors on each intake, and the injector delivers a timed "pulse" of fuel basically coinciding with the intake valve being open. So, when the valve is closed, no fuel is being delivered. Right?
1b. With other injection systems, does the injector deliver a constant stream of fuel to each intake? I assume the fuel is metered at one point, with each injector balanced with restrictors, etc.?
2. When does the decision on which system to use need to be made? By engine purchase? After engine purchase but before FWF install?
3. Is there any downside to fitting the tanks for return lines and capping them if not needed?
4. If my eventual engine/injector combo doesn't need a full-time return line, is there a downside to running a purge to one side, using dual wing root pumps with check valves, and eliminating a selector valve? I'm figuring on probably dropping the mechanical pump anyway...