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lwhitlow
Joined: 15 Jan 2006
Posts: 76
Location: Valparaiso Indiana
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 Posted: Sun Jan 18, 2009 3:48 pm Post subject: Fuel Pressure Sensor Location???? |
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All
I'm working on the engine install on my 601XL Jab 3300 with the Jab FWF kit
I'm using a Dynon ems and I'm at a loss on where to put the fuel pressure sensor ??
Should it go in the line after the engine driven fuel pump?
Or should it be before??
How about the primer port on the Gascolator???
I have no clue here and pictures as always would be helpful
Thanks
Larry
601XL 85%done 71% to go
N69102 (reserved) or N747LW (reserved) can't make up my mind
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DaveG601XL
Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh
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| Posted: Sun Jan 18, 2009 4:21 pm Post subject: Re: Fuel Pressure Sensor Location???? |
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Larry,
The fuel pressure transducer should be placed between the engine fuel pump and the carb. Cap off the primer port on the gaslocator.
Unfortunately I do not have a good picture of my fuel pressure transducer. Attached is the best I have. I mounted my oil recovery bottle on the right side motor mounts by way of sheet aluminum and adel clamps. I mounted the fuel pressure transducer to the back of this mounting sheet using a big adel clamp around the transducer.
Good luck,
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David Gallagher
Cincinnati, OH area |
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don(at)pcperfect.com
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| Posted: Sun Jan 18, 2009 4:47 pm Post subject: Fuel Pressure Sensor Location???? |
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I have a 3300 on the older 601HDS with a Dynon EMS (FlightDek 180) which
should be similar to your setup.
Since ultimately you care about the pressure that the carb is seeing, I
took the fuel hose from the output of the mechanical/engine driven fuel
pump and placed a T connector in it and connected one end to the fuel
pressure sensor (that I got from Dynon) and the other end to the carb
fuel intake port. My fuel pressure sensor is located on the right side
of the firewall (passenger side).
I also placed the fuel pressure sensor at the same level as the carb - I
don't understand this but I was told that if I was concerned about the
pressure #s of the carb, that the fuel pressure sensor should be at the
same level for the best accuracy.
Be aware that the Dynon setup may not be the best for the 3300s. If I
remember correctly, our fuel pressure needs to be between 0.75 to 3 PSI.
The Dynon is setup for a sender that measures 0 to 30PSI and combined
with the fact that Dynon doesn't include a zero'ing function in their
software to handle starting at a true 0 point with the sensor your
numbers may not be all that accurate for the range we need to measure
(with any luck they'll update their software in the next version).
Also, if I understand this correctly the idea is just to have a bit of
positive pressure with the Bing carbs. If you have too much - over 3 PSI
(?), you'll overwhelm the carb and have issues with fuel overflowing,
etc. For what it's worth, I normally see between 1 to 1.75 PSI with just
the engine driven pump running depending on WOT or cruise.
Don
--
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lwhitlow
Joined: 15 Jan 2006
Posts: 76
Location: Valparaiso Indiana
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| Posted: Sun Jan 18, 2009 6:01 pm Post subject: Re: Fuel Pressure Sensor Location???? |
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| DaveG601XL wrote: | Larry,
The fuel pressure transducer should be placed between the engine fuel pump and the carb. Cap off the primer port on the gaslocator.
Unfortunately I do not have a good picture of my fuel pressure transducer. Attached is the best I have. I mounted my oil recovery bottle on the right side motor mounts by way of sheet aluminum and adel clamps. I mounted the fuel pressure transducer to the back of this mounting sheet using a big adel clamp around the transducer.
Good luck, |
Thanks Dave!! I kinda thought it would have to go in the line from the fuel pump to the carb but it never hurts to ask. I'm doing my oil recovery the same way so I'll just put it there.
Larry
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lwhitlow
Joined: 15 Jan 2006
Posts: 76
Location: Valparaiso Indiana
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| Posted: Sun Jan 18, 2009 6:03 pm Post subject: Re: Fuel Pressure Sensor Location???? |
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| don(at)pcperfect.com wrote: | I have a 3300 on the older 601HDS with a Dynon EMS (FlightDek 180) which
should be similar to your setup.
Since ultimately you care about the pressure that the carb is seeing, I
took the fuel hose from the output of the mechanical/engine driven fuel
pump and placed a T connector in it and connected one end to the fuel
pressure sensor (that I got from Dynon) and the other end to the carb
fuel intake port. My fuel pressure sensor is located on the right side
of the firewall (passenger side).
I also placed the fuel pressure sensor at the same level as the carb - I
don't understand this but I was told that if I was concerned about the
pressure #s of the carb, that the fuel pressure sensor should be at the
same level for the best accuracy.
Be aware that the Dynon setup may not be the best for the 3300s. If I
remember correctly, our fuel pressure needs to be between 0.75 to 3 PSI.
The Dynon is setup for a sender that measures 0 to 30PSI and combined
with the fact that Dynon doesn't include a zero'ing function in their
software to handle starting at a true 0 point with the sensor your
numbers may not be all that accurate for the range we need to measure
(with any luck they'll update their software in the next version).
Also, if I understand this correctly the idea is just to have a bit of
positive pressure with the Bing carbs. If you have too much - over 3 PSI
(?), you'll overwhelm the carb and have issues with fuel overflowing,
etc. For what it's worth, I normally see between 1 to 1.75 PSI with just
the engine driven pump running depending on WOT or cruise.
Don
-- |
Thanks Don
I'm gonna post a question over on the Dynon site and see if they can offer any help
Larry
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DaveG601XL
Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh
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| Posted: Sun Jan 18, 2009 7:06 pm Post subject: Re: Fuel Pressure Sensor Location???? |
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Larry,
I agree with Don that there could be something better than a 0-30 PSI transducer here. I asked Dynon about a smaller one last year, but they do not offer one. The 0-30 does seem to work OK, but we are definately on it's low end.
If you could find a 0-10 or 0-15 transducer that works on 5 VDC excitation and is compatible with engine compartment surroundings, it would probably work. I would go fly and not sweat it for now (I did).
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David Gallagher
Cincinnati, OH area |
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jeromedelamare(at)free.fr
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| Posted: Sun Jan 18, 2009 11:55 pm Post subject: Fuel Pressure Sensor Location???? |
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I use a UMA 7 psi sensor between mechanical pump and carb. It's perfect. I
calibrate it with the file attached.
http://www.aircraftspruce.com/catalog/inpages/umasenderA.php
Jérôme
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1EUsensorsCAL.xls |
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don(at)pcperfect.com
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| Posted: Mon Jan 19, 2009 8:31 am Post subject: Fuel Pressure Sensor Location???? |
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Thanks Jérôme!
I went ahead and forwarded this information over to Dynon which is the EMS I'm using. I asked them to add support for it along with a zero'ing function.
If anybody else would like them to add support for the 0 to 7 PSI UMA Sensor please e-mail them at support(at)dynonavionics.com (only if they see a decent number of e-mails will they add the feature, so please e-mail them if this affects you!). On the surface it appears to be a much better fit than the 0 to 30 PSI VDO (?) Sensor they are packaging now for the Jabiru Kits.
Don Honabach
Zenith 601HDS
N601DX
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