2FlyAgain Posted October 16, 2016 Report Share Posted October 16, 2016 I some times get a high fuel pressure warning on start up. In a recent case , it seemed that it was likely an electrical grounding issue. After retightening the ground bolts, the fuel pressure was better. But, then during run-up one of the ignition circuits dropped about 200 RPM and did not sound good. Normal drop is 110-130 on each side. As I taxied back to the hanger, the engine did not run well at idle RPM. A week later I started the engine again to reproduce the problem. The engine started normally. Again, there was a high fuel pressure indication ranging between 7-10 psi that seemed more stable. During run-up at both 3000 and 4000 RPM both ignition circuits gave similar drops of 120-150 RPM. The fuel pressure settled down to less than 6 PSI. Returning engine all the way to idle and it struggled to run. Note: I have had two mechanics with ROTAX experience try to set the idle down from 2100-2200 RPM with no luck in either case. Now suddenly the engine was idling at 1700 RPM or even less and struggling. I needed to crack the throttle during taxi back to the hangar. The fuel has been Shell 91 octane with no alcohol according to the pump. The carbs were rebuilt during the last five-year rubber change in 2012. After reviewing some threads on this forum, I can think of several possible issues (carb bowl debris, clogged fuel filter, ignition modules, etc.). My question for the forum members is in what order do I suggest that a local mechanic start the trouble shooting process? Thanks in advance… Link to comment Share on other sites More sharing options...
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