UAV engine EFI installation manual-DLE120-V1.4
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Chapter 5 Initial test after the
installation
Before you do the initial test of the EFI kit, make sure the installation is done as the
previous section.
Key-on and KEY-ON ONLY!
You should hear fuel pump noise running for a few seconds, if this is not happening, you
must have some wiring problem. Re-check all your wires! If every wire is sure correctly
connected, then the ECU may have a problem.
If you hear the fuel pump running and then stop, this indicates the ECU is working. Now
you can fill the fuel tank with the regular gasoline.
Repeat the above step 3 times, to make sure the fuel supply lines are filled up with fuel.
No air pocket! No bubbles!
Sometime, you have to manually purge out all the air bubbles in the fuel supply system,
because it is possible that if the fuel pump itself has a lot bubbles in there, it could not
pump fuel at all, it is only spinning like idle without load. In this case the noise of fuel
pump is little higher pitch than with fuel pumping. In this case you will not be able to start
no matter what, because no fuel pumping. If you have any doubt that the fuel supply
system has some air pocket or air bubbles, you can un-plug the high pressure fuel line,
pointing it into a bottle, and key-on, you should see fuel sprout out if fuel pump is working
and no air bubbles.
In many cases, you can visually see the fuel flow out of the fuel pressure regulator and
return back to the tank if the fuel supply system is working normally. This is another
indication you can check.
After you make sure the fuel supply system is working normally, try to rotate the propeller
to start the engine.
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