Kavlico, Fuel Pressure Sensor, PN 103755-000

[skippydiesel]

Dynon Technical Advisor has suggested complete removal of electrical connection plug seal, to facilitate access to ambient air  pressure.

 

I will give it a go but doubt its efficacy, as already have made "slits" in seal for this purpose AND think the little "pin" hole in the sensor casing is likly to be doing the job.😈

[IBob]

Well, Skippy, you're not short of advice and suggestions.
Time now to actually troubleshoot the problem?

[skippydiesel]

3 hours ago, IBob said:

Well, Skippy, you're not short of advice and suggestions.
Time now to actually troubleshoot the problem?

Yes!

Unfortunatly cloud cover complet, base probably 2000ft, airfield 900ft  - can make noises on the ground but that is not where the problem lies.😈

[skippydiesel]

Just back from 1.2 hrs - bit lumpy a 3,000ft , below . Veeeery nice at 5500 ft above cloud.

 

Went for the simple/cheap fix first - removed electrical plug from sensor, enlarged existing slot in rubber seal, rodded (meaning vigorously poked a bit of safety wire) the existing 1.5 mm hole in casing (previously drilled by me)

 

Fuel pressure remained as expected, through climb/descent, various other manoeuvres including several stalls. Happy (for the moment)😈

[Moneybox]

KISS, just fit another pump that has been working but has run out of life. It'll take you a whole 10 minutes to prove or disprove the simplest fix. I have one but it would take a week to get to you. 

 

Sorry, didn't see that you had it fixed 😅

Edited Wednesday at 02:27 AM by Moneybox

[skippydiesel]

Not so happy now !

 

Low fuel pressure went off on decent (500 ft/min) from 3500 down to 3000 ft. Forced myself not to put boost pump on - flew for another 30 minutes or so with low pressure alarm going of intermittently. Pressure indication slow fluctuations from 1 psi up to 4 psi - No change in engine performance. Boost pump on before landing - pressure indication normalised - 4.5  psi.

 

On landing removed seal from sensor plug. Wet weather forecast so won't be able to fly for a few days.

 

 

[IBob]

Skippy, so after it began to play up, you flew level again at normal power, and it still played up?
I ask because on my aircraft, the airflow around the cowl changes (as you would expect) with different aircraft attitudes. The result in my cases is that in a hard climb the naca scoop on the top no longer scoops.
A long shot, I know, but I thought I would tip it into the mix....

Edited Wednesday at 07:44 AM by IBob

[facthunter]

Why do you fly around when the pressure is lower than required?  . IF you are doing testing it at height above a suitable landing place.  Nev