ORIGINAL: WildBillKelso
Been flying less then a year. Got an alpha 40 as my next plane and put a brand new thunger tiger pro 46 in it. I broke it in at a varied half throttle through 2 tanks. I can get the engine to idle good and have actually gotten a few flights on it. Then it started. Last time I flew (3 flights) I could get it in the air and the engine seemed to die at about the same time in flight. only about 3 or 4 minutes each time. I think it is to lean. I did a ground run on it to were it is really making power and then went out 2 more clicks. Hope that fixes that. Now it will run but then it starts to cut out and die a few seconds after i get to full power and I can see air bubbles going through the fuel line right before it happens. Tank is full by the way. Seems to run fine at mid throttle and idle, and seems to transition pretty good through the whole throttle range. Do I need to change out the fuel line or should I be looking at a problem with the tank? Or for that matter some where else. Dealing with these engines makes me want to go electric now or just quit. Any help would be appreciated.
I had a similar problem on an OS 46 FX.
The problem was with the fuel lines. I would make sure that they are clean with out any obstructions. If you are using a filter, make sure that there is not a hairball in the filter that is starving the engine for fuel. (That was what my problem was.).
Try removing the needle then blow into the back pressure line (the one attached to the muffler) you should get a good spray of fuel with little effort. If you have trouble getting fuel out, or it take a hard blow to get it out , you may have a blockage in the lines.
Good luck