I'm gonna piggy back here too, or tell me to get my own thread
re: full flow vs full pressure. I picked up a used electric pump, and had a chance to play with it this evening, and about 10 feet of clear 5/16 tubing.
observations:
1. It takes a number of seconds to fill the tube at full flow.
2. The pump keeps running when max pressure is reached, and runs at the same speed regardless of the volume it puts out (function of differential pressure).
So let's say it takes 5 seconds to fill the coil of tubing back up to some safe distance from the top, and when the controller senses the level at the bottom, it will always runs the pump for 5 seconds. And keep track of how many 5 second runs it made. Given that there are variations from stroke to stroke, I think it makes sense to ONLY track how many times the pump was turned on for 5 seconds (for example), and not precisely how many times the piston moved.
I don't think it should be full flow though, I can't quite explain why though. Intuitively I think if the immediate pump outlet had a restriction, that would only allow a little more fuel than anticipated maximum demand would require, then it would give more predictable results as it would have to run longer to refill the tube/resivoir, and there would be less variation in the outlet pressure the pump sees.
Quote:
Originally Posted by dcb
I like how far your drip counter idea has come
I think this will work, for my bike , the microcontroller just turns the pump on for a specific amount of time when the resivoir looks low, and keeps count. The pump doesn't run so long that it would overflow the resivoir, might even want a restriction on the pump outlet. I'm ready to go get a cheap fuel pump.
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