REFLECTOR: Dynon fuel pressure

[Scott Derrick]

The problem is the Dynon has three fuel pressure sensors options

1.) VDO 0-30 PSI
2.) VDO 0-80 PSI
3.) GRT 0-30 PSI

Just hooking up any sensors won't cut it. I know the two VDO's are 
resistance sensors, which the dynon probably monitors the current change 
as the resistance changes in the sensor.  Not sure what the GRT sensor 
outputs but the dynon is going to expect a range of 0-30 psi?

A solid state resistance sensor with a 0-80 PSI input with a 1-180 ohm 
output would do, I think.

Scott


-------- Original Message --------
Subject: Re: REFLECTOR: Dynon fuel pressure
From: John Tvedte <johnt at comp-sol.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Date: 04/04/2012 12:32 PM

> Well - GRT offerd a Measurement Specialties MSP300-100-P-4-A-1  -
>
> http://www.meas-spec.com/downloads/MSP300.pdf
>
> Pretty sure this is good to 100psi - looks like part # nomenclature has changed.
>
> Available from Digikey. For example: MSP3101P4A1-ND
>
> John
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Andrew Judge
> Sent: Wednesday, April 04, 2012 12:03 PM
> To: 'reflector at tvbf.org'
> Subject: Re: REFLECTOR: Dynon fuel pressure
>
> 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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