Is the hose clear? Sounds almost like you have a check valve in the line.
Did you make up the hose by putting on ends? If you made the hose or had it
made to length, there is a possibility that a "donut" has been cut out of
the hose side wall making a flapper valve. Happens when someone doesn't use
a mandrel.
--

--
Cy Galley - Chair,
AirVenture Emergency Aircraft Repair
A Service Project of Chapter 75
EAA Safety Programs Editor - TC
EAA Sport Pilot

wrote in message
...

"Kyle Boatright" wrote in message
...

"Kyle Boatright" wrote in message
...

"Jim Carriere" wrote in message
.. .
Kyle Boatright wrote:

I was out flying this evening (Beautiful evening in North Georgia. We
don't get better flying weather than today...) and noticed that my oil
pressure was "stuck" at 100 PSI. I reduced throttle and RPM, no
change, I increased throttle and RPM, again no change. I tapped the
face of the gauge. No change.

Eventually, I shut down the radios and transponder and turned off the
master switch. The OP gauge fell to zero. Back on with the master and
it's 100 PSI again. By the time I returned to my home field, the
pressure gauge seemed to be acting normal again, so I presume it is
going to be an intermittant problem - the absolute worst kind to
diagnose.

Anyway, the gauge and sender are both Rochester brand. Probably 6
years old (4.5 years flying)with 350 or so tach hours on 'em.

How do I diagnose the problem when it recurrs?

This is a gauge with a remote sender mounted on the engine, right? I
ask that because what you are describing sounds like a wetline gauge
with some air in the line and cold oil.


This is an electronic gauge with a sender mounted on the engine
accessory case.

Correction, this gauge is mounted on the firewall, and has a 12" or so
hose connecting it back to the oil pressure pick-up port on the engine.

KB

Man, I can't get things straight this morning. The sender is on the
firewall, fed by the 12" hose.

Sheesh. No wonder I rarely post in the AM.

KB