ORIGINAL: Ray Davis Gaspar...doesn't/shouldn't the ECU just continuely re-adjust the pump voltage in order to maintain a stable idle RPM (55K for the 44-Gold)? Certainly if calibrated correctly on start-up....unless, perhaps, there is rapidly and large varying fuel system restrictions, e.g., beyond the ECUs ability to respond that fast. Which I think highly unlikely!
After all, the ECU is 'fast enough'/it quickly varies pump voltage to accommodate desired throttle demand/RPM extremes very nicely when all is well. So, I could understand a 'hunting' idle if there are truly changing fuel system conditions, but why it 'hangs' at a high idle is still a mystery to me.
Not difficult to understand, the scenary here is that the fuel system is changing its conditions (up and down) while the engine is running. Up cause high idle, not a big issue in these small engines. Low cause a flameout, a issue much more serious. So the ecu is programmed to keep the engine alive, so it never leaves it to run below idle. If this cause a "high idle" situation in the engine, this is a very minor issue compered with a flameout. If the ecu is programmed to drastically decrease the pump if the idle is over the calibrated, on next "cycle" of fuel restriction/pump failure/too fast deceleration... the engine will flame out. Not good form my point of view.
Gaspar,
Where can I buy the XEL80 pump?
here :
http://www.xicoy.com/catalog/product...60&language=en
Gaspar