REFLECTOR: Dynon fuel pressure

[Douglas Holub]

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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