lml@lancaironline.net Mailing List Archive

HI THERE

the fuel probe in the Lancair 4 is installed from the tip.

there are no serviceable parts in the probe; it is about ten feet long and is shipped
by truck in a 12 foot box and shipping costs about the same as the probe

i have been dealing with an intermittent for about six months and located the wiring issue an the
head of the probe. could move the wires around and get good indications... for part of one trip
tried tie wraps, tried loose, tried tight, tried epoxy. i got good at removing the wing tip

NO GOOD,
we removed the probe and nothing we could do. ordered the twelve foot box shipped from California

that's more than i wanted to know about fuel probes.

a sad side note is that the very early Lancair 4 airplanes had the probe installed from the wing root and to fix them it is necessary to remove the wing. that was a bad idea from the get-go

peter

From: lml@lancaironline.net
To: lml@lancaironline.net
Subject: lml Digest #4734
Date: Thu, 4 Sep 2014 06:00:03 -0400

        Lancair Mailing List Digest #4734
 
 1) Right Fuel Tank Probe
    by Alan Crawford <alan@tstar.net>
 2) Re: Engine Oil Temps; May need fuel system setup
    by George Wehrung <gw5@me.com>
 
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--Forwarded Message Attachment--
Date: Wed, 3 Sep 2014 11:52:16 -0400
From: alan@tstar.net
Subject: Right Fuel Tank Probe

Need help ... Right fuel tank gauge is intermittent ... Where does the wiring come from the fuel tank probe to the Garmin 900 display? ... Looking for a loose connection!

House is being remodeled and can't find my books or notes in storage?

Blue Skies

Alan

Flown to you by Race 21 via EFB

Life is NOT a Journey to the grave with the Intention of arriving safely In a Pretty and Well Preserved Body, BUT rather to skid in broadside,Thoroughly used up, Totally Worn Out, and Proclaiming ..... “WOW, WHAT A RIDE!!!”

--Forwarded Message Attachment--
Date: Wed, 3 Sep 2014 11:52:38 -0400
From: gw5@me.com
Subject: Re: [LML] Re: Engine Oil Temps; May need fuel system setup

Thanks Bob. I always appreciate the help

George

Sent from my iPad

On Sep 2, 2014, at 16:13, bob mackey <n103md@yahoo.com> wrote:

> Does anyone have any recommendations?

A few....
1) specify the type of engine and aircraft
2) check the obvious things first:
Is there enough oil?
Is the oil freely moving through the oil cooler?
Is cool air blowing through the oil cooler?
Was it working fine before? Or was the oil always too hot?

If it is a recent problem, what changed? (Change it back)
If it is a chronic problem with this aircraft, what is the air pressure drop across the cooler? What is the air temperature increase after passing through the oil cooler? Is the right oil cooler installed?

It is not at all clear to me that the warm oil is an indication of a fuel problem.
If all 4 or 6 cylinders are running smoothly ROP and LOP, then the problem is heat removal, not fuel supply. If the CHTs are OK, then the problem is specifically about the oil system, and not airflow over the cylinders.
Changing the fuel system when the oil cooler is clogged would just compound the problems.