Low Fuel Pres w/Mech Pump

If it's a 2009 build I bet it's the AC gold colored pump unless someone has already changed it out. If it is toss it and put on the newer Corona pump that is aluminum colored with screws around its outside edge..

A plus of the new pump is that rather than the drip hole on the old ones, it comes with a spigot. This allows one to run a hose to a safe place so, in the event of a diaphragm leak oil/fuel is not sprayed onto the nearby exhaust pipe, but harmlessly overboard.

A side note: The drainage line has to be routed into a ram-air and vacuum-free zone, according to the requirements and release of BRP-Rotax. The drainage line must not be routed into the slipstream. Ram pressure or vacuum impairs the fuel pressure.

https://www.rotax-owner.com/pdf/IM_912_Series_Ed3_R0.pdf

Well...finally made it back to the hanger, checked the fuel pump and it's grey. So sometime ago it was changed out.

Put the cowling back on and took her up with the express purpose of watching the fuel pressure. What was interesting this time was recurrent periods of pressures greater than the max rated of 5.8 PSI. It periodically reached 6.4!! Mind you, the AUX fuel pump is OFF...while taxiing back to the hanger. During the entire time flying it never read a low pressure; either normal or high. I am wondering if I have a faulty pressure pressure sensor. 

The hose coming from the pump runs to the outside of the cowling, co-pilot side next to the gas-colator.