912 ULS, 100HP, Will Not Start
in General Tech Discussion
10 years ago
Have a RV-12 with a Rotax 912ULS. In February 2014 it ran like a charm. Then, in preparation for the DAR inspection and Airworthiness Certificate, I took out the fuel tank and opened up the aircraft for inspection. But, I needed the Aircraft Registration first. Took over ten months to get the correct registration (ELSA) out of the Ok City FAA Registration Branch. The Airworthiness Certificate took only seven days. Then I put the aircraft back together.
Engine, which has less than an hour on it, will try to start and run ten to twenty seconds, then die. RPM gets up to about 1200. Acts like it is starving for fuel. The electric pump is good, the fuel shutoff valve is good. I cleaned the screen (didn’t find much) of the gascolator. Fuel flow out of the gascolator is good
Pulled four spark plugs. They appear good and are dry.
The Bing carburetors’ bowls have fuel in them. I did not empty the carburetor of fuel (100LL) during the year the engine was sitting waiting for FAA paperwork. Did find some debris in the float bowls – kind of white pieces of sand. Putting the white sand pieces between my fingers and rubbing, the sand turned to a white paste. Cleaned out the bowls. The floats in both carburetors ‘float’. The main jet easily moves up and down. The idle jet appears clean (I have not removed it). Sprayed carb cleaner on the main and idler jets and then blew canned air on them.
Tried to start the engine again today and got the same result. With the throttle full back to idle and the choke full on, the engine will start, but then dies after a ten to twenty second run. With the choke off, the engine will not start.
Any suggestions on what I should try next?
Engine, which has less than an hour on it, will try to start and run ten to twenty seconds, then die. RPM gets up to about 1200. Acts like it is starving for fuel. The electric pump is good, the fuel shutoff valve is good. I cleaned the screen (didn’t find much) of the gascolator. Fuel flow out of the gascolator is good
Pulled four spark plugs. They appear good and are dry.
The Bing carburetors’ bowls have fuel in them. I did not empty the carburetor of fuel (100LL) during the year the engine was sitting waiting for FAA paperwork. Did find some debris in the float bowls – kind of white pieces of sand. Putting the white sand pieces between my fingers and rubbing, the sand turned to a white paste. Cleaned out the bowls. The floats in both carburetors ‘float’. The main jet easily moves up and down. The idle jet appears clean (I have not removed it). Sprayed carb cleaner on the main and idler jets and then blew canned air on them.
Tried to start the engine again today and got the same result. With the throttle full back to idle and the choke full on, the engine will start, but then dies after a ten to twenty second run. With the choke off, the engine will not start.
Any suggestions on what I should try next?
