Daida
Well Known Member
Dear community!
Situation:
When my engine is running (1000 rpm) and i switch on my auxiliary fuel pump, rpm decreases, engine running very rough, dark exhaust gas, fuel flow increase.
Conclusion:
Mixture gets way over rich!
Solutions:
...................
The whole story:
I recently did the first engine run. Went perfectly except the thing mentioned above.
Engine is a ECi Titan IOX-360 with dual P-Mag. It starts perfectly, runs smooth as silk through all RPM range. Fuelflow and pressure are all good.
I have an Airmotiveengeneering (AE) fuel injection system that came with the engine.
Fuelflow tests were all good.
Aux pump on, engine not running, mixyure rich, fuelflow at the FUELPUMP and VAPOR SEPARATOR ASSEMBLY was 170 Ltr/hr or 37,4 gal/hr.
Aux pump on, engine not running, mixture rich, throttle wide open, fuel pump at the spider (AE fuel manifold valve assembly) was 84 Ltr/hr or 18,5 gal/hr.
After the first engine run and the issue with the rough idle i repeated the tests with the same results.
I added another test.
Aux pump on, engine not running, mixture cut off, .....BUT......
fuelflow at the spider was 12 Ltr/ hr or 2,6 gal/hr !!
That seemed strange to me!
Of course, aux pump off, no flow at all.
During the engine runs the engine quit immediately when mixture was pulled to cut off (aux pump not running).
I figure that the aux fuel pump makes so much pressure to force fuel through no matter what!
Question:
Anyone encountered the same thing?
Anyone have advice for me how to deal with it?
Situation:
When my engine is running (1000 rpm) and i switch on my auxiliary fuel pump, rpm decreases, engine running very rough, dark exhaust gas, fuel flow increase.
Conclusion:
Mixture gets way over rich!
Solutions:
...................
The whole story:
I recently did the first engine run. Went perfectly except the thing mentioned above.
Engine is a ECi Titan IOX-360 with dual P-Mag. It starts perfectly, runs smooth as silk through all RPM range. Fuelflow and pressure are all good.
I have an Airmotiveengeneering (AE) fuel injection system that came with the engine.
Fuelflow tests were all good.
Aux pump on, engine not running, mixyure rich, fuelflow at the FUELPUMP and VAPOR SEPARATOR ASSEMBLY was 170 Ltr/hr or 37,4 gal/hr.
Aux pump on, engine not running, mixture rich, throttle wide open, fuel pump at the spider (AE fuel manifold valve assembly) was 84 Ltr/hr or 18,5 gal/hr.
After the first engine run and the issue with the rough idle i repeated the tests with the same results.
I added another test.
Aux pump on, engine not running, mixture cut off, .....BUT......
fuelflow at the spider was 12 Ltr/ hr or 2,6 gal/hr !!
That seemed strange to me!
Of course, aux pump off, no flow at all.
During the engine runs the engine quit immediately when mixture was pulled to cut off (aux pump not running).
I figure that the aux fuel pump makes so much pressure to force fuel through no matter what!
Question:
Anyone encountered the same thing?
Anyone have advice for me how to deal with it?