High Fuel Pressure Reading

[0TreeLemur]

I have a J model with a JPI EDM900 installed.  Lately after startup the fuel pressure has been indicating over 30 psi.  With or without boost pump on.   During runup it sometimes indicates  above 30.   After takeoff, it indicates 27-28 psi.

It seems unlikely that an engine driven fuel pump is going to go over max. rated pressure at any engine speed < redline.   Suspect a transducer problem.   Anybody dealt with this?  I'm not worried about it- I just don't like it.  Anyone got a working spare they'll part with?  The part is made by Kavlico, with 0-30 range outputting 50mV at 30psi.

EDIT: Added screencap of JPI data.   The red line is MAP, light blue line is FP.   You can see after I took off, it went back down into the normal range.  Had a time mid-flight there were FP was pretty noisy.

 

[RoundTwo]

I’ll usually look for a bad ground when flaky readings present themselves. Can you “T” the line for a test with an analog gauge?

[Rick Junkin]

Check the barrel connector on the transducer pigtail. It’s likely dirty/corroded. Cleaning it up may provide a short term fix. It worked on my Bravo.

There’s a service instruction from the transducer manufacturer that essentially says to replace the barrel connector with individual knife connectors on each wire. I have it filed, once I get to my computer I’ll send you a copy.

[Rick Junkin]

@0TreeLemur Found it

BENZ AIRBORNE-KULITE TRANSDUCER.pdf

[EricJ]

I don't think I've ever seen somebody suggest replacing a pinned connector with handshake terminals before.

[N201MKTurbo]

56 minutes ago, EricJ said:

I don't think I've ever seen somebody suggest replacing a pinned connector with handshake terminals before.

I did it on the pressure transducer for a Saratoga landing gear. The connector was intermittent and unobtainable. Worked great afterward. They weren’t AMP CPC connectors.

[0TreeLemur]

Thanks @Rick Junkin.   I too suspect a connection issue.   Looking back through the EDM data collected during the past year, this problem has been intermittent, but increasing if frequency and severity of late.   The transducers included with my JPI use MetriPak connectors, which are "supposed" to be weather resistant.   I'll go ahead and remove the cowl and give them a look see.