The Murphy Builders Site

Posted: **Fri Feb 17, 2012 4:21 pm**

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To: murphy-rebel@dcsol.com
From: piquette@golden.net
Subject: fuel sender unit

We are building a taildragger version of the SR2500 and would like to know
where to install our fuel sender unit. We are installing a automobile float
type sender unit and need to know the best location to install in main rib
(center, forward, rear, ??). How is fuel measured accurately on the ground
with taildragger? How is fuel manually checked? Any suggestions would be
appreciated.

Peter & Monica SR003

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Posted: **Fri Feb 17, 2012 4:21 pm**

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To: <murphy-rebel@dcsol.com> (Murphy Rebel)
From: Bob Patterson <bob.patterson@canrem.com>
Subject: Re: fuel sender unit
Message-Id: <E0yfsKv-0006qU-00@mail1.toronto.istar.net>
Date: Sat, 30 May 1998 16:34:42 -0400

Manually checking fuel levels is done by putting a dipstick vertically
into the tank (a paint stir stick is great). The stick must be calibrated -
pour 5 gallons (or 25 litres, or whatever) into the tank, put in the stick,
make a mark. The mark can be some permanent marker, but cutting a notch into
the side of the stick is best - can't wash off !

Folks who are using capacitance-type guages usually run the sensor rod
from the outside top front of the tank to the inside bottom back of the
tank.
This type of guage ALSO needs to be calibrated ...

If you are using a Cessna-type float guage, perhaps the best place would
be toward the rear, 1/2 way up the tank, just in front of the fuel outlet.
This assumes that the float travel is such that the float will indicate
empty just before it touches the bottom of the tank, and full just before
it touches the top. Obviously, this type of guage will not be completely
accurate, as it will show full for some time, even though some fuel has
been burned, possibly causing problems with running short sooner than
expected,
and may show empty when there is still some fuel left (NOT a bad thing !!)

There IS some leeway to calibrate this type of guage before sealing the
tank, by bending the float arm (or changing its length), and the lettering
on the guage can also be changed.

All things considered, a sight guage (clear fuel-line with a striped
card behind it, for contrast) is easier to install, more accurate, and
easier to maintain.... (IMHO anyway !) :-)

With all types of guages, you might want to raise the tail to a
level-flight position, and re-calibrate, and mark accordingly - one
side for ground, the other for level flight. This INCLUDES the dipstick -
if you go to amphibs or straight floats, the aircraft will be in the
level attitude when you are dipping !

Good luck !!! .....bobp

-----------------------------orig.------------------------------------------
--
At 01:30 PM 5/30/98 -0400, you wrote:

We are building a taildragger version of the SR2500 and would like to know
where to install our fuel sender unit. We are installing a automobile

float

type sender unit and need to know the best location to install in main rib
(center, forward, rear, ??). How is fuel measured accurately on the ground
with taildragger? How is fuel manually checked? Any suggestions would be
appreciated.

Peter & Monica SR003

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Posted: **Fri Feb 17, 2012 4:21 pm**

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Hi Peter & Monica SR003
I Have a Cessna 170A that has a float type system and I don't recommend it
for
a tail dragger. The system is set up for flight so on the ground it reads
wrong. The C170 has a box built around the float to help with the float
bouncing around in flight. I think sight guages would be better than a float
system. I had a Super Cub that had both sides of the sight tube used, one
for
in flight and one for tail down, this worked out OK.
I used a capacitance system in my Rebel.
The following is a copy of a post I put on Murphy Builders Support Page
regarding a capacitance that I used.
P.S. I have a couple of extra probes left over , I'll sell them real cheap.

Capacitance Fuel System
I installed a Capacitance Fuel System from Westach.. Westberg MFG Inc. (707)
938-2121 (also in Aircraft Spruce Cat.) Total cost for two probes and a dual
gauge was $220. The probes I used were 24 inches long. The first 5 inches
are
bendable and the last 19 inches are used to measure the fuel quantity of the
tank. The probe is installed in the upper forward root rib were the cross
vent
would be ( I had to move the cross vent back a little ) The probe runs
diagonally, from the forward top to the aft bottom. This helps correct for
tail down or for flight attitude. You MUST drill a very small vent hole in
the
highest part of the tube to allow fuel to flow up and down in the tube
also
very important in using vertical stand pipe installation , so the fuel can
exit the pipe at the bottom ). I have tested the system and found it to be
very accurate. For more information, e-mail me at JimsRebel@aol.com

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Posted: **Fri Feb 17, 2012 4:21 pm**

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To: <murphy-rebel@dcsol.com> (Murphy Rebel)
From: Murphy Aircraft Tech Department <murtech@murphyair.com >
Subject: Re: fuel sender unit
Date: Mon, 1 Jun 1998 12:38:52 -0700

At 01:30 PM 5/30/98 -0400, you wrote:

We are building a taildragger version of the SR2500 and would like to know
where to install our fuel sender unit. We are installing a automobile

float

type sender unit and need to know the best location to install in main rib
(center, forward, rear, ??). How is fuel measured accurately on the ground
with taildragger? How is fuel manually checked? Any suggestions would be
appreciated.

Peter & Monica SR003

Hi agian;

best place for me is forward, not accurate on the ground but relaible in the
air.
Murphy Aircraft Mfg. Ltd.
Ph: 1-604-792-5855
Fax: 1-604-792-7006
e-mail: murtech@murphyir.com
Web Site: http://www.murphyair.com

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Posted: **Fri Feb 17, 2012 4:21 pm**

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To: <murphy-rebel@dcsol.com> (Murphy Rebel)
From: Murphy Aircraft Tech Department <murtech@murphyair.com >
Subject: Re: fuel sender unit
Date: Mon, 1 Jun 1998 12:38:48 -0700

At 04:34 PM 5/30/98 -0400, you wrote:

Manually checking fuel levels is done by putting a dipstick vertically
into the tank (a paint stir stick is great). The stick must be calibrated -
pour 5 gallons (or 25 litres, or whatever) into the tank, put in the stick,
make a mark. The mark can be some permanent marker, but cutting a notch

into

the side of the stick is best - can't wash off !

Folks who are using capacitance-type guages usually run the sensor rod
from the outside top front of the tank to the inside bottom back of the

tank.

This type of guage ALSO needs to be calibrated ...

If you are using a Cessna-type float guage, perhaps the best place

would

be toward the rear, 1/2 way up the tank, just in front of the fuel outlet.
This assumes that the float travel is such that the float will indicate
empty just before it touches the bottom of the tank, and full just before
it touches the top. Obviously, this type of guage will not be completely
accurate, as it will show full for some time, even though some fuel has
been burned, possibly causing problems with running short sooner than

expected,

and may show empty when there is still some fuel left (NOT a bad thing !!)

There IS some leeway to calibrate this type of guage before sealing the
tank, by bending the float arm (or changing its length), and the lettering
on the guage can also be changed.

All things considered, a sight guage (clear fuel-line with a striped
card behind it, for contrast) is easier to install, more accurate, and
easier to maintain.... (IMHO anyway !) :-)

With all types of guages, you might want to raise the tail to a
level-flight position, and re-calibrate, and mark accordingly - one
side for ground, the other for level flight. This INCLUDES the dipstick -
if you go to amphibs or straight floats, the aircraft will be in the
level attitude when you are dipping !

Good luck !!! .....bobp

-----------------------------orig.-----------------------------------------

---

At 01:30 PM 5/30/98 -0400, you wrote:
We are building a taildragger version of the SR2500 and would like to know
where to install our fuel sender unit. We are installing a automobile

float

type sender unit and need to know the best location to install in main rib
(center, forward, rear, ??). How is fuel measured accurately on the

ground

with taildragger? How is fuel manually checked? Any suggestions would be
appreciated.

Peter & Monica SR003

Hi there;

We put the fuel sensor up to the main spar on the SR. proto. not very
accurate on the ground but an honest reading in the air.
Regards;
Dennis
Murphy Aircraft Mfg. Ltd.
Ph: 1-604-792-5855
Fax: 1-604-792-7006
e-mail: murtech@murphyir.com
Web Site: http://www.murphyair.com

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