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keithmckinley
Joined: 11 Aug 2008
Posts: 434
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 Posted: Tue Jul 28, 2009 8:25 pm Post subject: mounting fuel flow transducer in a CJ |
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Just wondering how you guys with fuel flow instruments in your CJ are mounting the transducer.
There is a very short fuel line between pump and carb and I believe there needs to be 6" inches of straight fuel line in and out of the transducer.
The angles that the fittings enter the fuel pump and carb make it look a little awkward to get those straight runs.
Thanks
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dougsappllc(at)gmail.com
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| Posted: Wed Jul 29, 2009 7:25 am Post subject: mounting fuel flow transducer in a CJ |
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Consider mounting it in the belly just fwd of the sump tank.
FTI, I now am the dealer for a US made fuel flow, with fail safe tranducer, all the read outs including GPS coupling (fuel req to waypt). �Just ordered my first 4 units, will let you know how it works out. �Price is way below JPI, and others.
Doug
On Tue, Jul 28, 2009 at 9:25 PM, keithmckinley <keith.mckinley(at)townisp.com (keith.mckinley(at)townisp.com)> wrote:
| Quote: | --> Yak-List message posted by: "keithmckinley" <keith.mckinley(at)townisp.com (keith.mckinley(at)townisp.com)>
Just wondering how you guys with fuel flow instruments in your CJ are mounting the transducer.
There is a very short �fuel line between pump and carb and I believe there needs to be 6" inches of straight fuel line in and out of the transducer.
The angles that the fittings enter the fuel pump and carb make it look a little awkward to get those straight runs.
Thanks
--------
Keith McKinley
700HS
KFIT
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=255070#255070
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Always Yakin,
Doug Sapp
Phone 509-826-4610
Fax 509-826-3644
[quote][b]
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threein60(at)yahoo.com
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| Posted: Wed Jul 29, 2009 9:22 am Post subject: mounting fuel flow transducer in a CJ |
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Doug,
The transducer needs to be relatively close to the carb. The further it is away, the more friction and turbulence will be introduced. This will mess with the accuracy of the transducer. Also, remember there is a one way check valve way forward of the sump with a bypass line. If you install the transducer aft of this return, your actual fuel flow will be inaccurate.
I would suggest the best place is on the outer firewall, just aft of the carb. But, just thinking out loud.
Larry Pine
--- On Wed, 7/29/09, doug sapp <dougsappllc(at)gmail.com> wrote:
| Quote: |
From: doug sapp <dougsappllc(at)gmail.com>
Subject: Re: mounting fuel flow transducer in a CJ
To: yak-list(at)matronics.com
Date: Wednesday, July 29, 2009, 8:10 AM
Consider mounting it in the belly just fwd of the sump tank.
FTI, I now am the dealer for a US made fuel flow, with fail safe tranducer, all the read outs including GPS coupling (fuel req to waypt). Just ordered my first 4 units, will let you know how it works out. Price is way below JPI, and others.
Doug
On Tue, Jul 28, 2009 at 9:25 PM, keithmckinley <keith.mckinley(at)townisp.com (keith.mckinley(at)townisp.com)> wrote:
| Quote: | --> Yak-List message posted by: "keithmckinley" <keith.mckinley(at)townisp.com (keith.mckinley(at)townisp.com)>
Just wondering how you guys with fuel flow instruments in your CJ are mounting the transducer.
There is a very short fuel line between pump and carb and I believe there needs to be 6" inches of straight fuel line in and out of the transducer.
The angles that the fittings enter the fuel pump and carb make it look a little awkward to get those straight runs.
Thanks
--------
Keith McKinley
700HS
KFIT
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=255070#255070
===========
rget="_blank">http://www.matronics.com/Navigator?Yak-List
===========
http://forums.matronics.com
===========
le, List Admin.
="_blank">http://www.matronics.com/contribution
===========
|
--
Always Yakin,
Doug Sapp
Phone 509-826-4610
Fax 509-826-3644
| Quote: |
et=_blank rel=nofollow>http://www.matronics.com/Navigator?Yak-List
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blank rel=nofollow>http://www.matronics.com/contribution
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[quote][b]
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dougsappllc(at)gmail.com
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| Posted: Wed Jul 29, 2009 11:13 am Post subject: mounting fuel flow transducer in a CJ |
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Larry,Good point and you are correct on all points, unless it was possible to install it just aft of the firewall. �Mine are all just before the carb. �Maybe I�should�get busy and make up a special hose to use for this application. �Will give it a look see this coming weekend.
Doug
On Wed, Jul 29, 2009 at 9:25 AM, Larry Pine <threein60(at)yahoo.com (threein60(at)yahoo.com)> wrote:
| Quote: | Doug,
The transducer needs to be relatively close to the carb. The further it is away, the more friction and turbulence will be introduced.� This will mess with the accuracy of the transducer.� Also, remember there is a one way check valve way forward of the sump with a bypass line. If you install the transducer aft of this return, your actual fuel flow will be inaccurate.
�
I would suggest the best place is on the outer firewall, just aft of the carb.� But, just thinking out loud.
Larry Pine
--- On Wed, 7/29/09, doug sapp <dougsappllc(at)gmail.com (dougsappllc(at)gmail.com)> wrote:
| Quote: |
From: doug sapp <dougsappllc(at)gmail.com (dougsappllc(at)gmail.com)>
Subject: Re: Yak-List: mounting fuel flow transducer in a CJ
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Date: Wednesday, July 29, 2009, 8:10 AM
Consider mounting it in the belly just fwd of the sump tank.
FTI, I now am the dealer for a US made fuel flow, with fail safe tranducer, all the read outs including GPS coupling (fuel req to waypt). �Just ordered my first 4 units, will let you know how it works out. �Price is way below JPI, and others.
Doug
On Tue, Jul 28, 2009 at 9:25 PM, keithmckinley <keith.mckinley(at)townisp.com> wrote:
--
Always Yakin,
Doug Sapp
Phone 509-826-4610
Fax 509-826-3644
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--
Always Yakin,
Doug Sapp
Phone 509-826-4610
Fax 509-826-3644
[quote][b]
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keithmckinley
Joined: 11 Aug 2008
Posts: 434
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| Posted: Wed Jul 29, 2009 12:18 pm Post subject: Re: mounting fuel flow transducer in a CJ |
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and that's the problem...The transducer NEEDS to be located between the fuel pump and carb to be accurate...AND it needs at least 6" of straight pipe in and out of the unit
Keith
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keithmckinley
Joined: 11 Aug 2008
Posts: 434
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| Posted: Wed Jul 29, 2009 12:18 pm Post subject: Re: mounting fuel flow transducer in a CJ |
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and that's the problem...The transducer NEEDS to be located between the fuel pump and carb to be accurate...AND it needs at least 6" of straight pipe in and out of the unit
Keith
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threein60(at)yahoo.com
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| Posted: Wed Jul 29, 2009 1:13 pm Post subject: mounting fuel flow transducer in a CJ |
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Here is a bad picture of mine.. But you get the idea. I have just shy of 6 inches. I have a EI fuel computer with the Gold transducer. The newer transducers are not as touchy as the old ones. You just want to limit the number of bends and turns. I have a 90 degree going in and 45 degree on the exit of the transducer.
Larry Pine
--- On Wed, 7/29/09, keithmckinley <keith.mckinley(at)townisp.com> wrote:
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keithmckinley
Joined: 11 Aug 2008
Posts: 434
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| Posted: Wed Jul 29, 2009 2:17 pm Post subject: Re: mounting fuel flow transducer in a CJ |
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you're right...it's tough to see. Thanks for sending the picture.
You've got a really clean, nice looking CJ!
~K
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rogerbyak(at)yahoo.com
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| Posted: Wed Jul 29, 2009 6:26 pm Post subject: mounting fuel flow transducer in a CJ |
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Keith;
I intalled the standard transducer that is used on a JPI install on my CJ6a. You are accurate when you suggest that the length of the line does not allow for sufficient line length as detailed in the install guidelines. I found similiar conflicts in the install of the same transducer on a Cessna 182 application (altho that one did not "violate" the rules as severly as did the CJ6a install)
In both cases, I have used the aircraft for extended periods of time and find that the fuel used data is VERY close to the actual amount of fuel used.....generally within 2-3%. I have concluded that the requirements for the install did not apply to my specific aircraft.
How your luck will parallel mine. rb
--- On Tue, 7/28/09, keithmckinley <keith.mckinley(at)townisp.com> wrote:
| Quote: |
From: keithmckinley <keith.mckinley(at)townisp.com>
Subject: mounting fuel flow transducer in a CJ
To: yak-list(at)matronics.com
Date: Tuesday, July 28, 2009, 9:25 PM
--> Yak-List message posted by: "keithmckinley" <keith.mckinley(at)townisp.com (keith.mckinley(at)townisp.com)>
Just wondering how you guys with fuel flow instruments in your CJ are mounting the transducer.
There is a very short fuel line between pump and carb and I believe there needs to be 6" inches of straight fuel line in and out of the transducer.
The angles that the fittings enter the fuel pump and carb make it look a little awkward to get those straight runs.
Thanks
--------
Keith McKinley
700HS
KFIT
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=255070#25507Navigator?Yak-List" target=_blank>http://www.matronics.com/Navigator?Yak-; - MATRONICS WEB FORUMS -
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