Has anyone tried a peristaltic pump? It should work as pump for fuel pressure but it may be able to be used to replace the solenoid if you used a controller similar to the one for the solenoid. Has anyone measured the flow rate the solenoid puts out at different throttle settings? If you knew the flow rates then finding an alternative to the solenoid may be easier because you could set the controller to mimic the flow rates of the solenoid. It may help in finding base settings for something like a peristaltic pump. I know all of you have spent a ton of time working on your present solution so looking for alternatives may not interest you. All of the work you have done is inspiring and I like looking at different ways of doing things. Thanks