Mailing List flyrotary@lancaironline.net Message #49770
From: Mike Wills <rv-4mike@cox.net>
Subject: Re: [FlyRotary] Re: Fuel Pressure sender questions
Date: Mon, 18 Jan 2010 09:37:23 -0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Tough call on mounting location. Do you want it in the cockpit where you are, or under the cowl where all the ignition sources are if it decides to leak? Mine is in the cockpit just downstream of the fuel pumps in the control stick well.
 
As Tracy mentioned, VDO says don’t use them with fuel. So I used a gauge isolator to keep fuel off of the sensor. But could never get the thing to work reliably. I tried repeatedly to get the air out of the isolator, tried different types of fluid, etc... with no luck. Finally gave up on the isolator. Hopefully I'll have the same luck Tracy has had with no problems - its been about 1 1/2 years so far.
 
Mike Wills
RV-4 N144MW

Sent: Sunday, January 17, 2010 6:28 AM
Subject: [FlyRotary] Re: Fuel Pressure sender questions

I have always mounted them under the cowl.

BTW, VDO about 2 years ago started attaching a note to their pressure sensors saying to NOT use them for fuel system use.  I've been using them for fuel system pressure use for about 10 years with no problems but thought I'd pass that along. 

As Lynn pointed out, there are isolators that can separate the fuel from the sensor if you want to be careful.

Tracy

On Sun, Jan 17, 2010 at 9:16 AM, <dlomheim@aol.com> wrote:
Hey RV flyers; I'm curious what you all are doing to mount your fuel pressure sending unit...are you mounting it in the cockpit area just downstream of fuel pumps or on the firewall or engine?  Is there a best place to locate it?  
 
I have seen some AN "Fuel Pressure Gauge Fittings" (with a 1/8 in. NPT hole tapped into them) in both JEEGs (#555-100520) and SUMMIT which seems like it might be a good way to go...
 
Thanks for your input.
 
Doug

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