Fuel Pressure Low

Hi Jeff,

Have spent the last two days checking everything I can think of.

Did not find a " smoking gun". 

Decided to supplement existing orange fire sleeve, on long fuel line from gascolater to mechanical pump, with reflective aluminised adhesive backed air-condition tape and as an added precaution, fitted a lightweight aluminium heat shield to the gascolator.

I have never experienced fuel vaporisation in the air - only on the ground. The ground symptoms, (ATEC Zephyr, 912 ULS,) involved - very hot day (40+C) hard starting,  loss of power & rough running after short (15-20 min) engine shutdown & restart.. The current symptoms are in Cruise, random low pressure/high flow readings, without any change in engine performance. 

I think the problem more likly to be electronic/electrical - to this end have checked every connection for security /good fit. Found EMS module plugs were connected but benefited from additional tightening of security screws ?????

If the problem persists, I will certainly give the AvGas a go.😈

Hi Sean,

In one of your posts in another thread you mentioned that your aircraft's fuel tanks differ from the standard Sonex configuration. Is there any possibility that at a low fuel level (after 2-3 hours) and a nose-low attitude (in cruise or descent), fuel sloshing in the tanks could be momentarily unporting the fuel pickup and letting small amounts of air into the fuel supply?

Good thought Tim,

My three tank system comprises; two (30L) wing tanks with external fill ports and a single in fuselage (40L) tank, that can only be filled from the wing tanks - I call it a "header" tank.

While it is possible to draw fuel from each tank individually to the engine, this is not how I manage my system.

I use my header, as my engine supply tank and transfer fuel as required from the wings.

The header tank has a deep V built in to the base, specifically to reduce the chances of unporting. This with the regular topping up from the wing tanks, would make your suggestion unlikly.😈