J.P. Instruments EDM 760 Installation Manual

J.P.Instruments Fuel Flow Installation Manual Report # 760

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 1 of 14 Rev NC :
Date 07/20/99

Appendix – A –

Fuel Flow Transducer Installation

Table of Contents

Page

1. General 2

2. Initial Check Out 3

3. Installing the Fuel Flow Transducer 4

4. Route the Optional warning control line 5

5. Rout the Fuel Flow Transducer Wires 5

6. System Checkout 5

7. Specifications and Limitations 6

8. Drawing 700923 8

9. Drawing 700922 9

10. Drawing 700921 10

11. Drawing 760124 11

12. Drawing 760744 12

13. Drawing 700920 Installing the Fuel Flow Differential Module 13,14

J.P.INSTRUMENTS
PO BOX 7033
HUNTINGTON BEACH CA 92646

Last printed 06/12/03 3:25 PM

J.P.Instruments Fuel Flow Installation Manual Report # 760

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 2 of 14 Rev NC :
Date 07/20/99

EDM-760 with Fuel Flow Option

Installation Instructions

1…General:

A complete thorough familiarization and understanding of the system and this manual is necessary before
commencing the installation. All work must conform with A.C. 43.13.1A ch. 11 sec. 2, 3, 7. The accuracy of this
instrument depends entirely upon the accuracy of the data entered. A periodical checking of the actual fuel onboard
will eliminate the accumulation of errors due to evaporation leaks, etc.

Do not use the FXT-201 Flow Transducer on aircraft with a gravity feed system. The standard

Fuel Transducer (FXT-201) shipped with the EDM-760(),with Fuel Flow option Fuel Flow instrument is
intended to be used on aircraft equipped with fuel pumps.

Transducer Identification Markings

FXT-201 - Marked "20 l " on the top of the unit.

Installation of the EDM- 760(), with Fuel Flow option on an aircraft with a fuel return line from the
Carburetor requires a FFDM-1 Differential Module .

The placard "Do Not Rely on Fuel Flow Instrument to Determine Fuel Levels in Tanks" must be

mounted on the aircraft instrument panel near the EDM-760, ( ) with fuel flow option.

If the aircraft is equipped with a primary fuel flow, the following placard must be mounted on the
aircraft instrument panel near the EDM- 760(),WITH FUEL FLOW OPTION( ): "Refer to Original Fuel Flow

Instrumentation for Primary Information".

J.P.Instruments Fuel Flow Installation Manual Report # 760

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 3 of 14 Rev NC :
Date 07/20/99

2…. Initial Check Out

1. The aircraft owner must read the Warranty before starting the installation. There is information in the
Warranty that may alter your decision to install this instrument. If you do not accept the terms of the

Warranty, JPI offers a 30 day money back guarantee.

2. If you are not an FAA Certified Aircraft Mechanic familiar with the issues of installing aircraft fuel
flow, Do Not attempt to install this instrument. The installer should use current aircraft standards

and practices to install this instrument (refer to AC 43.13).

3. Check that any necessary FAA Approvals (STC's, etc.) are available for your aircraft before
starting the installation. The FAA Approved Model List (AML) is located at the back of this manual.

4. Read the entire Installation Instructions and resolve any issues you may have before starting the
installation.

5. THIS INSTALLATION WILL REQUIRE SOME PARTS UNIQUE TO YOUR AIRCRAFT THAT ARE
NOT SUPPLIED IN THE KIT (including, but not limited to hoses and fittings). Acquire all the parts
necessary to install this instrument before starting the installation. Do not use aluminum fittings with the
FXT-201.

6. Check that the instrument make and model are correct before starting the installation (check the
markings on the side of the instrument. A carbureted engine with a fuel return line requires an FFDM-I ,
which can be purchased from Electronics International, 12620 S.W. 231 PL, Hillsboro OR (503) 628-

9113.

7. Before starting the installation make sure the unit will fit in the location you intend using.

8. If this instrument is to replace an existing unit in the aircraft, it is the installer's responsibility to move or
replace any existing instruments or components in accordance with FAA approved methods and proce­dures. The following Installation Instructions do not cover moving or the removal of any existing
instruments or components.

9. Before connecting any hoses to the transducer, thoroughly clean them and insure they are free of any
loose material. Never pass high pressure air through or blow through the transducer, damage

will occur.

10. Remove the transducer cap plugs when ready to install hoses. Do not use aluminum fittings with the fuel
flow transducer or Gauling may occur.

11. Note the direction of fuel flow marked on the transducer. Fuel must flow in this direction.

12. Mount the transducer with the three wires pointing up.

13. Note and record the K-factor engraved in the side of the transducer.

J.P.Instruments Fuel Flow Installation Manual Report # 760

END VIEW UP

Carburetor or Servo

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 4 of 14 Rev NC :
Date 07/20/99

3…. Installing the Fuel Flow Transducer:

Mount the Fuel Flow Transducer using the appropriate drawing at the back of this manual.

Aircraft Configuration Drawing #

1. All Fuel injected engines with vapor return lines to fuel tank

700922

, all Continental and certain Lycoming engines.

2. All pump fed carbureted and Fuel injected engines without

700921

vapor return lines.

3. Pressure Carbureted engines with vapor return lines

700923
700920

The instructions listed below must be followed when installing a Fuel Flow Transducer.
Note: If your engine is equipped with a fuel return line from the carburetor back to the fuel tank you will need to

install two flow transducers... one in the feed line from the fuel pump to the carburetor and one in the return line
from the carburetor back to the fuel tank. Also, a Fuel Flow Differential Module (Dwg. 700920 ) will need to be
installed.

The transducer output port should be mounted lower or even with the carburetor inlet port (or fuel servo on a fuel
injected engine). If this is not possible, a loop should be put in the fuel line between the Fuel Flow Transducer
and the carburetor or fuel servo (see diagram below).

Location

Between throttle body
and fuel flow divider.

Between engine driven
pump and servo/throttle
body or carburetor

One transducer in Carb
inlet line and one
transducer in out let line

Page

9

10

8,

13,14

Do not remove the caps on the flow transducer until the fuel hoses are ready to be installed.
The flow of fuel through the transducer must follow the direction marked on the transducer.

Mount the
transducer
with the
wires up.

If the transducer is
higher than the
carburetor or fuel servo,
put a loop in the fuel line
between the transducer
and the carburetor or
fuel servo.

¼ NPT

SIDE VIEW

The direction of the
fuel flow through the
transducer is marked
on top

J.P.Instruments Fuel Flow Installation Manual Report # 760

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 5 of 14 Rev NC :
Date 07/20/99

The flow transducer must be mounted so the wires exiting the transducer are pointing up.
Before connecting any hoses, thoroughly clean them and insure they are free of any loose material. High

air pressure my be used, However, do not allow high air pressure to pass through the flow

transducer.

4…. Route the (Optional) External Warning Control Line:

The wire from pin 15 on the J-1 (D-SUB 25) Connector can be connected to an external warning light or
buzzer. This wire grounds when the display flashing a warning is on. The current in this line must be limited
to 2/10 of an amp maximum. Exceeding this limit will damage the unit. If this feature is not used leave this
line open. Tie wrap this wire so it does not obstruct the freedom of travel- controls.

5…. Route the Fuel Flow Transducer Wires: (The following section is an excerpt from report
#103 Installation Manual, STC 2586NM)

Route the thermocouple and fuel flow wires from the probes through the firewall using fireproof
rubber grommets and flame retarding silicone. Use an existing hole if possible. Following the
existing wiring harness and connect to the indicator marking each lead with the cylinder number.
All wires must be routed away from high temperature areas (exhaust stacks, turbochargers,
etc.). Secure Probe leads to a convenient location on the engine approximately 8 to 12 inches
from the probe, being sure there is sufficient slack to absorb engine torque. It is essential in
routing the probe and fuel flow transducer wires not be allowed to touch metal parts of the
air-frame or engine since abrasion will destroy this wire. Connect wires in accordance with dwg.
700744, page 12

6….. System Checkout : Check instrument operation as follows:

1. Turn the aircraft master switch on (engine off) and set the toggle switch to Fuel Flow . Tap the step

switch until 0 GPH is displayed. Turn the boost pump on for a few seconds. The display should indicate
3 to 8 GPH.. A problem at this step could be caused by poor connections on the red or black power and
ground leads.

2. Set the instrument toggle switch to "Fuel Flow" and check for a digital fuel flow reading of "00 GPH"

indicates the fuel flow is too low to register. A reading of “ ---GPH “ dashes indicate no fuel flow
transducer signals. A problem at this step could be caused by a poor connection or crossed flow
transducer wires.

3. With the engine running, check the "FLOW" Display Mode to read properly. If there is a problem at this

point Refer to EDM-700 Fuel Flow Option Supplement Rev C. Section 4 for troubleshooting
information.

4. After running the engine, check the fuel hoses, transducers and fittings for leaks.

J.P.Instruments Fuel Flow Installation Manual Report # 760

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 6 of 14 Rev NC :
Date 07/20/99

7… Specifications and Limitations

Model:

EDM-760(), with Fuel Flow option
Case Dimensions:

2.5" x 2.5" x 7.5" depth, 3.125" Bezel.

Weight:

Unit Only: 16 oz
Flow Transducer: 3 oz

Environmental;

Passed TSO C43c and DO-178a (software level 3)
Power Requirements:

10 to 35 Volts, 2 Amp.

Low Fuel Warning Display

The display message will blink anytime the programmed Low Fuel Reminder, Low Fuel Warning or the Time
to Empty Limit are violated.

External Warning Control Line:

Grounds external light when any EDM-760 warning display is on or blinking. Current should be limited to
2/10 amp.

Accuracy:

Flow: 2% or better in accordance with TSO C44a.

Resolution

Fuel Flow: 0.1 Gal. or 1 Lb. or .1 Ltr.
Fuel Remaining: 0.1 Gal. or 1 Lb. or . 1 Ltr.
Fuel Used: 0.1 Gal. or 1 Lb. or .1 Ltr.
Time to Empty: 10 minute

Max Displayed Range (Unit Only):

Fuel Flow: 199.9 Gals. or 162.0 or Gal/Hr or 1199 Lbs/Hr or 749 Ltr/Hr.
Fuel Remaining: 999 Gals. or 811 or Gals. or 1999 Lbs. or 1999 Ltrs.
Fuel Used: 999 Gals. or 811 or Gals. or 1999 Lbs. or 1999 Ltrs.
Time to Empty: 19 hours 59 minutes

J.P.Instruments Fuel Flow Installation Manual Report # 760

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 7 of 14 Rev NC :
Date 07/20/99

SPECIFICATIONS TRANSDUCER

Fuel Flow Transducer, Standard (FXT-201)

Range: 0.6 to 60 GPH
Linearity: %1 (8 to 60 GPH)
K Factor Approx. 29,000
Pressure Drop: 1.2 PSI at 30 GPH

4.8 PSI at 60 GPH
Working Press: 200 PSI
Min. Burst Press: 2000 PSI
Temp. Range: -65'C to 125'C
Fuel Ports: 1/4" Female NPT

J.P.Instruments Fuel Flow Installation Manual Report # 760

Fuel line from

OUT

Fuel IN

Fittings ¼ NPT to Fuel

900591B

Mount to

Clamp as

AE102/62-24

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 8 of 14 Rev NC :
Date 07/20/99

the Carburetor
To the Fuel

8 inches
Maximum
from
support

TRANSDUCER

Aeroquip Fire

Aeroquip

To the Fuel

Sleeve
AE102/62-24

MS 21919

Aeroquip Fire sleeve

Hose (do not use
aluminum fittings

Firewall or

Mounting Procedure:

1. Find a convenient location within 8" of a hose support or fitting and away from any hot

exhaust pipes to suspend the Fuel Flow Transducer. The hose support or fitting may be on the
input or output line of the Flow Transducer.

2. Remove the fuel hose which goes from the Carburetor to the Fuel Tank.

3. Purchase two new hoses, one from the Carburetor to the Fuel Flow Transducer and the other

from the Fuel Flow Transducer to the Fuel Tank. There must be flexible hose in and out of

the Transducer. The hoses must meet TSO-C53a Type C or D FAA specification. The new
hoses must be the same diameter as the current hose in the aircraft. A source of fittings

and fabricated hoses is:

Sacramento Sky Ranch Inc.
[phone] Fax: [phone]
or

Herber Aircraft
1401 E. Franklin Ave.
El Segundo, CA 90245 [phone]

4. Mount the Fuel Flow Transducer in the fuel supply line and in the return line for pressure

carburetors. The Flow Transducer must be wrapped with Fire Sleeving. Place a small hole
in the fire sleeve and pass the transducer wires through it. Seal with High temperature Silicone

RTV sealant.

5. Before connecting fuel hose to the carburetor , verify that the boost pump delivers at least

125% of takeoff fuel consumption at minimum fuel pressure as marked on fuel pressure gage.

J.P.INSTRUMENTS

PO Box 7033
Huntington Beach CA 92646

Title : Installation of a Fuel Flow Transducer in the

fuel supply or return line from the carburetor to the
fuel tank

Drawing No. 700923

Date

02/14/97

Drawn/ Approved

Rev NC

J.P.Instruments Fuel Flow Installation Manual Report # 760

OUT

From the Throttle

fittings

Aeroquip Fire

900591B

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 9 of 14 Rev NC :
Date 07/20/99

To the Flow

Aeroquip

Mounting Procedure:

1. Find a convenient location between the Throttle Body and the Flow

Divider and away from any hot exhaust pipes to suspend the Fuel
Flow Transducer.

2. Remove the fuel hose which goes from the Throttle Body to the Flow

Divider.

3. Purchase two new hoses, one from the Fuel Servo to the Fuel Flow

Transducer and the other from the Fuel Flow Transducer to the Flow
Divider. There must be flexible hose in and out of the Fuel

Transducer. The hoses must meet TSO-C53a Type C or D FAA
specification. The new hoses must be the same size as the current
hose in the aircraft. A source of fittings and fabricated hoses is:

4. Mount the Fuel Flow Transducer in the fuel line. The Flow

Transducer must be wrapped with Fire Sleeving. Place a small
hole in the fire sleeve and pass the transducer wires through it.

Seal with High temperature Silicone RTV sealant.

5. Secure at either end of the transducer to any convenient point on the

engine with MS21919 clamps or equivalent.

6. For Continental fuel injected engines adjust the fuel pressure to account for the pressure drop across

the transducer per Continental Service Bulletin M89-10

See

Fittings ¼
NPT to Fuel
Hose (do not
use aluminum

Sleeve
AE102/62-24

Aeroquuip
303 hose

J.P.INSTRUMENTS

PO Box 7033
Huntington Beach CA 92646
Title Installation of the Fuel Flow Transducer in the fuel line

between the Throttle Body and the Flow Divider. Only applicable
for Continental Fuel Injected Engines

Drawing No. 700922

Date

02/14/97

Drawn/ Approved

Rev NC

J.P.Instruments Fuel Flow Installation Manual Report # 760

[phone] Fax: [phone]

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 10 of 14 Rev NC :
Date 07/20/99

Fuel injector
Existing Fitting

MS21919
Clamp as

TRANSDUCER

To Engine Driven

Fuel Pump Existing
8" max
from support

Aeroquip
900591B

Aeroquip Fire Sleeve
AE102/624-24

2-AN816- Pipe to
Flare fitting. Do not
use aluminum fittings

New 303Aeroquip
hose

Mounting Procedure:

1. Find a convenient location within 8" of a hose support or fitting and away from any hot exhaust
pipes to suspend the Fuel Flow Transducer. The hose support or fitting may be on the input or
output line of the Flow Transducer.

2. Remove the fuel hose which goes from the Fuel Pump to the Carburetor (or Fuel Servo).

2. Purchase two new hoses, one from the fuel pump (or the Fuel Filter) to the Fuel Flow
Transducer and the other from the Fuel Flow Transducer to the carburetor (or fuel servo).
There must be flexible hose in and out of the Transducer. The hoses must meet TSO-C53a
Type C or D FAA specification. The new hoses must be the same size as
the current hose in the aircraft. A source of fittings and fabricated hoses is:

Sacramento Sky Ranch Inc.

Herber Aircraft
1401 E. Franklin Ave.
El Segundo, CA 90245 [phone]

4. Mount the Fuel Flow Transducer in the fuel line. The FXT-201 Transducer is marked "Model

201" on the top of the transducer. The Flow Transducer must be wrapped with Fire
Sleeving. Place a small hole in the fire sleeve and pass the transducer wires through it. Seal

with High temperature Silicone RTV sealant.

5. Before connecting fuel hose to the carburetor , verify that the boost pump delivers at least

125% of takeoff fuel consumption at minimum fuel pressure as marked on fuel pressure gage.

J.P.INSTRUMENTS

PO Box 7033
Huntington Beach CA 92646

Title : Installation of a Fuel Flow Transducer in the fuel line

from the fuel pump to the carburetor or fuel servo.

Drawing No. 700921

Date

02/14/97

Drawn Approved

Rev NC

J.P.Instruments Fuel Flow Installation Manual Report # 760

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 11 of 14 Rev NC :
Date 07/20/99

J.P.Instruments Fuel Flow Installation Manual Report # 760

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 12 of 14 Rev NC :
Date 07/20/99

J.P.Instruments Fuel Flow Installation Manual Report # 760

Connect to

connector

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 13 of 14 Rev NC :
Date 07/20/99

the 15 pin D­SUB

J.P.INSTRUMENTS

PO Box 7033
Huntington Beach CA 92646

Title: FFDM-1 Interconnect Wiring

Diagram

Drawing No. 700920

Date

02/14/97

Drawn Approve

d

Sheet
1 of 2

Rev NC

J.P.Instruments Fuel Flow Installation Manual Report # 760

for EDM-760 temperature indicating system with Fuel Flow Option Appendix - A

Page Page 14 of 14 Rev NC :
Date 07/20/99

10.. Installing the Electronic International Fuel Flow Differential Module (FFDM-I):

If your engine is equipped with a fuel return line from the carburetor back to the fuel tank, install the
FFDM-1 in the aircraft as outlined below (see sheet one ). Otherwise, omit this step.

a) Connect the connector to the FFDM-I.
b) Install the FFDM-1 under the instrument panel using two tie wraps on each end of the module to

support it to a wire bundle or bracket.

c) Route and connect the 3' red power lead to the 12 or 24 volt bus via a 1 amp fuse.

d) Route and connect the 3' black ground lead to the same ground used for the EDM-760(),with Fuel

Flow option.

e) Route and connect the 6' red, black and white leads marked "Feed" to the flow transducer installed

in the fuel line from the fuel pump to the carburetor.

f) Route and connect the 6' red, black and white leads marked "Return" to the flow transducer

installed in the return fuel line from the carburetor to the fuel tank.

g) Connect the red, black and white leads to the same color 6' leads from the EDM-760(),with Fuel

Flow option.

Any excess wires can be rolled up and tie wrapped under the instrument panel. Tie wrap these wires

so they do not obstruct the freedom of travel of any controls.

J.P.INSTRUMENTS

PO Box 7033
Huntington Beach CA 92646

Title: FFDM-1 Interconnect Wiring

Diagram

Drawing No. 700920

Date

02/14/97

Drawn Approve

d

Sheet
2 of 2

Rev NC