REFLECTOR: Dynon fuel pressure

Scott Derrick scott at tnstaafl.net
Wed Apr 4 12:59:54 CDT 2012


Wish I would have known this before ordering a replacement VDO sensor a 
couple days ago!!

Thats probably why I have a high fuel pressure reading almost all the time.

GRT makes a fuel sender that the dynon talks to but it only goes to 30psi.

Scott


-------- Original Message --------
Subject: Re: REFLECTOR: Dynon fuel pressure
From: Andrew Judge <ajudge at grovenetworks.com>
To: 'reflector at tvbf.org' <reflector at tvbf.org>
Date: 04/04/2012 11:03 AM

> Add me to that list. High pressure FS always dies and fluctuates. Also add thee EGT probes. They die too.
>
> What's a good replacement for the fuel sensor for an injection engine?
>
> Andy
>
> ----- Original Message -----
> From: Douglas Holub [mailto:douglas.holub at gmail.com]
> Sent: Wednesday, April 04, 2012 12:59 PM
> To: Velocity Aircraft Owners and Builders list<reflector at tvbf.org>
> Subject: Re: REFLECTOR: Dynon fuel pressure
>
> Same with mine. The oil pressure is working fine but I need to replace the
> fuel pressure sensor.
> ----- Original Message -----
> From: "John Dibble"<aminetech at bluefrog.com>
> To: "Velocity Aircraft Owners and Builders list"<reflector at tvbf.org>
> Sent: Wednesday, April 04, 2012 12:20 PM
> Subject: Re: REFLECTOR: Dynon fuel pressure
>
>
>> Thanks.  I replaced mine as well.  It's nice to know what the problem is.
>> My VDO oil pressure sensor has worked perfectly.  I wonder what the
>> difference is.  Different mechanism?  Different pressure range?  Gas
>> affects the sensor and oil doesn't?
>>
>> John
>>
>> On 4/4/2012 10:48 AM, Laurence Coen wrote:
>>> John,
>>>
>>> I have a VDO fuel pressure gage that acts the same way.  I'm on my second
>>> sender and opened the old one to see what was inside.  It's a pressure
>>> operated rheostat and apparently the wiper arm starts making poor contact
>>> with the wire wound resistance over time causing a false high reading.
>>> It's a piece of junk in my opinion.
>>>
>>> Larry Coen
>>> N136LC
>>>
>>> --------------------------------------------------
>>> From: "John Dibble"<aminetech at bluefrog.com>
>>> Sent: Tuesday, April 03, 2012 9:36 AM
>>> To: "Velocity Aircraft Owners and Builders list"<reflector at tvbf.org>
>>> Subject: Re: REFLECTOR: Dynon fuel pressure
>>>
>>>> I'm planning to relocate my oil VDO sensor to the engine where it's
>>>> supposed to be and was also concerned about vibration.  What are you
>>>> using for your connection?
>>>>
>>>> My 2 terminal VDO fuel pressure sensor also exhibits strange readings.
>>>> When I start the engine it always reads correct at 7 psig (carburetor).
>>>> Then after 30 minutes or so, it often runs 11-15 and sometimes up to 25
>>>> psig.  The readings are not very stable, so I don't believe them.  I
>>>> think the wires may be bad.
>>>>
>>>> John
>>>>
>>>> On 4/2/2012 9:52 PM, Brian Michalk wrote:
>>>>> Yes, VDO makes I thought all of their sensors in ungrounded and
>>>>> grounded versions.  I have a few of them on the plane for oil pressure
>>>>> and fuel pressure, which for me is 45PSI.
>>>>>
>>>>> None of mine are hard mounted to the engine.  I've heard that the
>>>>> vibration can cause them to fail at the neck.  The orifice is a few
>>>>> thousandths in diameter, really small, so if it does break off it won't
>>>>> flow very much.
>>>>
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>>
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