REFLECTOR: Low Fuel Warning Sensor False Reading: SOLVED?

Gattenby gattenby at tulsaconnect.com
Tue Apr 29 19:25:46 CDT 2014


The "inside" end of some of these sensors are glass, some are plastic.  The have been reports of some of the plastic ones not being able to tolerate fuel.   

Noel




> On Apr 29, 2014, at 8:06 AM, Tom Falls <tomfalls6 at gmail.com> wrote:
> 
> Thanks Brian.  So how does this sensor mount to the sump tank?  Is it 3/8" NPT or 3/8" straight thread? If straight thread, how do you seal it to prevent leaks?
> 
> Thanks,
> 
> Tom
> 
>> On Apr 28, 2014, at 10:35 PM, Brian Michalk <michalk at awpi.com> wrote:
>> 
>> I didn't realize the URL didn't point to the sensor.
>> 
>> http://www.mcmaster.com/#4949k33/=rqo9c8
>> 
>> Mine is the 4949K33.
>> 
>>> On 04/28/2014 06:35 PM, Tom wrote:
>>> What’s the part number for this sensor? This link took me to page with multiple choices of sensor types.
>>> 
>>> Thanks,
>>> Tom
>>> 
>>> 
>>>> On Apr 28, 2014, at 10:55 AM, Brian Michalk <michalk at awpi.com> wrote:
>>>> 
>>>> An update to those of you using an optical fuel level sensor.
>>>> 
>>>> I had installed the Carlo Gavazzi sensor from McMaster Carr ( http://www.mcmaster.com/#liquid-level-sensors/=rqf988 ) because it's a solid state optical sensor that should never wear out.
>>>> 
>>>> I have had problems with it falsely indicating a low fuel situation in the sump.  Finally yesterday while flying I deduced that whenever I flew west towards the sun, the low fuel light would illuminate, and when I flew east away from the sun, the light would extinguish.
>>>> 
>>>> The manual does say the device doesn't work in sunlight, but I never considered bright light to be the culprit.  I am going to fly with the sump covered with material to confirm my suspicions.  If confirmed, I will be painting the sump tank so that sunlight will not penetrate the sump.
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>>> 
>>> 
>>> 
>>> 
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