I recently installed the Autometer 6963 Fuel Pressure Digital guage 0-100 psi. The EBL has a pre-defined profile for "AutoMtr 100 psi" and I tried that but the reading on my gauge vs what the EBL reports is not the same. I am splitting the output from the sender to both the EBL and the gauge. The gauge is reporting the exact value my mechanical gauge shows so I know that one is right.

Does anyone have the voltage range figured out on this sender so that I can configure a user device? I tried messing around with the voltage range a bit but it would take a long time to figure out where the accurate range is especially since my max PSI is only has high as 22.

Is it possible that the response time of the EBL in reading and translating the signal is much faster and therefor see's allot of fluctuation or is the 0-5v range too wide?

 

IIRC, it is .5 V at 0 psi and 4.5 V at 100 psi.

Best bet is to measure the voltage from the sensor and do the math for psi. Then compare that to the WUD & gauge readings. In the WUD can create a user device to correct for any ground offset.

RBob.

 

I've defined a user device for the 0.5 - 4.5v range. 0.5v is the zero PSI for sure, as for 100, I guess I'll never know since I don't have a way to test that high. The problem is that on the EBL I am seeing an oscillation around the actual reading. In other words the autometer gauge stays in sync with my mechanical gauge in the range of 14-20 psi smoothly but the EBL shows it bouncing around anywhere from 9 - 18 PSI while the gauge shows the steady 15 psi reading. As I reach 20, the ebl shows anywhere from 16-28 psi.

I tried using the filter on 100% and the EBL reported much closer to the gauge but of course its way too slow and takes too long to catch up to the correct reading for that moment in time.

Is this a case where I'd benefit from running a ground from the EBL to the ground location I used for the sensor/gauge?

 

The oscillation you are seeing is caused by fluctuations of the positive displacement fuel pump. Need to use a snubber to dampen it.

This is a plug in the line to the pressure transducer that has a very small hole in it. Such as 0.030". Mechanical gauges typically have these screwed into the gauge port fitting.

Between the snubber and the WUD filter you shoul dbe able to get the response and the smoothness.

RBob.