Low fuel pressure warning

[Paulo]

My EMS sometimes shows a LOW FUEL PRESSURE warning ?

Anybody has had a similar problem?  What causes it?

 

[PhantomPholly]

My EMS sometimes shows a LOW FUEL PRESSURE warning ?
What causes it?

Low fuel pressure?

Ok seriously I've had difficulty getting reliable fuel pressure readings.  We suspect that we just chose a poor location but it should be fine where it is - it just reads very low all the time.  Since my engine runs fine, it has been a low priority to fix.

Sensor is attached on the injection spider, exactly as if it were a Comanche twin (IO-320).

Other Dynon sensors have issues if the ground is not perfect - I haven't done any troubleshooting yet but you might try running a separate ground line from the block to the sensor and see if you get a different reading.

 

[skysailor]

Sensor is attached on the injection spider, exactly as if it were a Comanche twin (IO-320).


Phantom,

There is a problem with using the port on the flow divider. It normally has a small G stamped there. A friend installed a D120 in a Pitts and used the same port. He had the same problems you are having. Consultation with the engine manufacturer revealed that port is not a simple opening to the interior of the spider. Apparently it has a very small orifice and is actually plumbed behind some porting internally. It is designed to use a factory fuel flow gauge which has the internal setup to resolve the issue. He teed into the fuel line at the output of the fuel pump and had no further problems.

 

[PhantomPholly]

Sensor is attached on the injection spider, exactly as if it were a Comanche twin (IO-320).


Phantom,

There is a problem with using the port on the flow divider. It normally has a small G stamped there. A friend installed a D120 in a Pitts and used the same port. He had the same problems you are having. Consultation with the engine manufacturer revealed that port is not a simple opening to the interior of the spider. Apparently it has a very small orifice and is actually plumbed behind some porting internally. It is designed to use a factory fuel flow gauge which has the internal setup to resolve the issue. He teed into the fuel line at the output of the fuel pump and had no further problems.

Interesting - well, that fix is on the "nice to have" list for the moment. Busy moving out of my hanger and into another.

How's your project coming?

 

[skysailor]

Glacially, as in progress is being made but it seems undetectable.