Gents,
Regarding a Continental TSIO550E, climb power 34.5" RPM2500, Full rich 33 gph.
During a recent flight I experienced higher than normal fuel pressure.  The fuel flow was unchanged 33 gph as were the egt and cht temps.  Normally my fuel pressure is 36 psi but it climbed to 40 psi and the Chelton audible warning to "check engine" came on.  It is set to come on at 39.

Typically I would be suspicious of high pressure if fuel flow had dropped as this could indicate a restriction.  But everything else remained normal.  Low pressure could indicate several things such as broken line, failing pump, restriction, etc.

So what are the concerns with high fuel pressure?  What are the trouble shooting steps?  I suspect a possible wiring or sending unit issue?

Thanks
Bryan Burr
N132BB