I have the new style Airflow Performance fuel pump in my RV9A with an IO320, and the GRT Engine Information System and the GRT IFIS. The aircraft has just over 60 hours on it and a new issues has popped up. On climb out, full throttle, full mixture, boost pump on, on the last two flights, the "Fuel Flow Too High" warning lit up on the EFIS. I think the high limit on the fuel flow is set at 20 GPH and the fuel flow was indicating about 21 GPH. When I shut the fuel boost pump off, the fuel flow returned to normal. In cruise, or at any power setting for that matter, whenever I turn on the fuel boost pump, I get a rise of 5 to 6 GPH on the fuel flow readout.
To make matters more confusing, I also just noticed that I'm getting a Zero readout on my fuel pressure reading from the EIS through the EFIS. I don't think the two issues are related but I'm always suspicious when two things appear to happen at the same time.
I know that I'm getting fuel pressure as the fuel injected engine is running normally, both with the boost pump off or on.
I checked all of the fittings today thoroughly for a leak and there are no leaks.
Right now, I'm leaning towards two separate problems that just happened at the same time. The first is the fuel pressure sensor is faulty. The second is that there is something wrong with the boost pump in that it is sending too much fuel through when turned on.
Any ideas would be appreciated.
Thanks,
Curt
To make matters more confusing, I also just noticed that I'm getting a Zero readout on my fuel pressure reading from the EIS through the EFIS. I don't think the two issues are related but I'm always suspicious when two things appear to happen at the same time.
I know that I'm getting fuel pressure as the fuel injected engine is running normally, both with the boost pump off or on.
I checked all of the fittings today thoroughly for a leak and there are no leaks.
Right now, I'm leaning towards two separate problems that just happened at the same time. The first is the fuel pressure sensor is faulty. The second is that there is something wrong with the boost pump in that it is sending too much fuel through when turned on.
Any ideas would be appreciated.
Thanks,
Curt