I haven't had nearly as good of results as others with
fuel flow testing.
Since redoing my
fuel system to have only gravity feed, I'm lucky to get 13.5
gph with 10 gallons in the tank. Surprisingly, at a 19 deg angle the
fuel flow doesn't change much, the
fuel level has the most effect. I stopped at 19deg because I was getting nervous that the plane would fall and it was getting hard to push up the ramps.
At a 19 deg incline and 2 gallons in the tank I only get 10.8
GPH. This certainly isn't 1.5 times the
fuel flow a Jabiru 3300 can use. I was hoping for around 15
GPH. Ironically, from pictures I've seen, the Jabiru's intake appears to be higher than the AeroVee, making it even harder for the Jabiru to get the
fuel it needs.
I'm using AN-6 lines and fittings. From my tank the
fuel goes through a red cube sensor, then an inline
fuel filter, then a short run to the AeroInjector. The only thing I can think to do to get more
fuel flow is remove the red cube sensor. I've checked the
fuel filter for debris, and it was clean.
On a side note, I've looked at other builders sites, and believe that some of the testing done is invalid. Some builders will let their
fuel line hang down lower than the inlet of the carb, or add a short length of
fuel line to reach a bucket. Based on my testing, letting the
fuel line hang down even an inch can increase
fuel flow by 1
GPH with a half empty tank. It has a siphoning effect.
For example, I added a 5 inch
fuel line to the end of my
fuel system so the
fuel would more easily go into the gas can, and the siphoning effect increased my
fuel flow from 13.5gph to 17.7gph. So, any builder that simply disconnects the
fuel line from the carb, and lets it hang down from the gascolator would likely get fantastic
fuel flow due to the siphoning effect.
At the moment I don't have any idea how to make my
fuel system simpler other than removing the red cube sensor.
Anyone else run into this issue with the red cube? BTW, there is a T-fitting before the in-line
fuel filter that has a short run of
fuel line to remove water and other debris from the system. I did a flow test from that point and the curtis valve flowed 18.6GPH. That's not a fair comparison to the carb fitting though because the curtis valve is approx 7 inches lower than the rest of the system.
If you have a Jabiru 3300, red cube sensor, gravity fed system, and are able to get 15+
GPH with minimal
fuel in tank, and measuring the flow rate accurately, please respond with info on how this is done! :-)