I tried the hall effect device and magnet's flux was swamped by the flux from the coil, what I have right now is a photo cell on one side of the shaft and a LED on the other that has a piece of shrink tubing on it to restrict the light to a small beam that the shaft breaks when it is driven upward, the resistance of the photo cell changes from KΩs to 100s of KΩs, I'll use that as the trigger for a 555 one shot timer and the 555 out will drive an N FET
add on - The fuel pump has a sealed cap over the end with a vent tube, the points would create some dust, but the chamber should stay clean with out the points.