REFLECTOR: Dynon fuel pressure

[Scott Derrick]

if you have an open circuit you will get a very high reading, a loose 
connection indicate may cause a higher reading if the EMS is smoothing 
things out.

All my pressure sensors are not connected directly to the engine but use 
a short hose and are mounted on the firewall or engine mount. A direct 
mounting will shorten their life.

Scott

-------- Original Message --------
Subject: Re: REFLECTOR: Dynon fuel pressure
From: John Dibble <aminetech at bluefrog.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Date: 04/03/2012 08:36 AM

> 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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