Edelbrock 70403 Installation Manual Download Page 13

Page 13 of 22

Catalog #70403
Brochure No. 63-0147

©2003 Edelbrock Corporation

Rev. 1/03

2.8

EFI Vacuum “Tee” Installation

1.

Install the recommended jet into the EFI Vacuum
“Tee” and tighten fitting securely.

2.

Remove vacuum line from the vehicle’s fuel pressure
regulator.

3.

Install vacuum line from the vehicle’s fuel pressure
regulator onto the center barb fitting of the EFI
Vacuum “Tee”.

Note:

The center barb can easily be identified by the

anodized nut used to hold the Fuel Jet.

4.

Measure the correct length of vacuum line from the
barb on the Fuel Pressure Regulator to one port of
the EFI Vacuum “Tee”. Cut vacuum line and install.

5.

Measure the correct length of vacuum line from the
barb fitting of the nitrous pressure regulator to the
remaining open port on the EFI Vacuum “Tee”. Cut
vacuum line and install.

2.9 

Fuel Pressure Safety Switch Installation

1.

Locate fuel rail test port fitting.

2.

Make sure the vehicle’s engine is cool, release
pressure in fuel system by pressing down on valve
in center of the fitting. This will allow the pressure to
escape as well as some fuel.

3.

After relieving all pressure, remove test port fitting
core and install the 1/16 NPT male x 1/8 NPT female
brass fitting in its place, using liquid Teflon.

4.

Using liquid Teflon, install Fuel Pressure Safety
Switch into 1/16 NPT male x 1/8 NPT female brass
adapter.

Note:

On some vehicles, there is no test port fitting,

or the location of the test port fitting does not allow
ample room for the fuel pressure safety switch to be mounted. These applications (as shown in the photo) will
require the “Banjo nut” at the fuel filter to be drilled and tapped (1/16 NPT tap supplied with system) to allow
mounting of the fuel pressure safety switch.

Summary of Contents for 70403

Page 1: ...ng Instructions 9 2 3 Nitrous Bottle Orientation 9 2 4 Nitrous Bottle Installation 10 2 5 Nitrous Feed Line Mounting 11 2 6 Solenoid Mounting 11 2 7 Nitrous Spray Nozzle Installation 12 2 8 EFI Vacuum...

Page 2: ...by such use Edelbrock Corporation assumes no responsibility for damages incurred by the use of products manufactured or sold by Edelbrock Corporation on vehicles used for competition or racing Edelbro...

Page 3: ...rewdrivers Pliers Bench vise Wire crimping pliers wire strippers Floor jack Vehicle jackstands Safety glasses Power Tools Power drill Drill bits 1 4 1 2 and 3 8 You should understand the following ski...

Page 4: ...e nasal passages Nytrous Plus was specifically created for automotive applications and is available for sale to the public at many speed shops across the USA Safety Steps For Working With Nitrous Oxid...

Page 5: ...installation on vehicles with upgraded or modified equipment The solenoid and microswitch brackets are designed to be manipulated bent cut twisted etc and the electrical components have properly size...

Page 6: ...l Quality Because Nitrous Oxide is an oxidizer fuel selection is critical Both octane and fuel consistency affect fuel burn rate The oxidizer quality of nitrous oxide will accelerate the burn rate so...

Page 7: ...lter 4AN x 1 8 NPT straight fitting blue 1 3AN x 1 8 NPT straight fitting blue 1 Swivel adapter 1 8 NPT female x 4AN female 1 12 3AN Line Blue 1 1 8 NPT pipe nipple 1 3 ft Vacuum hose 1 50 psi Nitrous...

Page 8: ...Device or PRD It is a safety valve designed to vent the contents of the bottle into the atmosphere in case of a catastrophic event like a collision It is also installed to prevent the over pressurizat...

Page 9: ...es are assembled so that the bottom of the siphon tube is at the bottom of the bottle opposite the bottle label An Edelbrock nitrous bottle cannot be mounted upside down Edelbrock does not offer a non...

Page 10: ...y practices involved in working on a vehicle from under the vehicle and verify that there are no fuel lines fuel tank s brake lines emissions equipment or structural members in the way of potential mo...

Page 11: ...with minimal clearance Please look at the photo on the next page of a typical solenoid mounting location and adapt your bracket according to the needs of your particular application 2 6 2 Nitrous Sole...

Page 12: ...Modifications performed to a solenoid bracket depend on many factors When mounting the solenoid regulator assembly on the vehicle considerations should be taken regarding any potential interference w...

Page 13: ...on the EFI Vacuum Tee Cut vacuum line and install 2 9 Fuel Pressure Safety Switch Installation 1 Locate fuel rail test port fitting 2 Make sure the vehicle s engine is cool release pressure in fuel s...

Page 14: ...Stud Nylon insulated 187 15 2 ea 18 22g female spade connector Nylon insulated 16 1 ea 15 amp ATO blade fuse 3 1 Nitrous Electrical Kit Contents 3 0 Electrical System Installation Important The wirin...

Page 15: ...ID FUEL PRESSURE SAFETY SWITCH WARNING DO NOT CONNECT TO THIS TERMINAL MICROSWITCH RED WHITE BLACK BLUE RED SUPPLY 12v ON ACC GROUND 12 16 11 7 8 11 13 14 9 10 13 2 3 4 1 13 15 13 5 6 2 2 2 2 2002 Ede...

Page 16: ...es 8 feet of color coded wires to make the electrical system installation for your Edelbrock Nitrous System as easy as possible We recommend that you do not cut any lengths of wires from the wire harn...

Page 17: ...uded with the switch for applications that require special spacing during installation 3 7 Microswitch Installation and Wiring The function of your microswitch is to enable your nitrous system It shou...

Page 18: ...he needs of your particular application The microswitch bracket is drilled to allow many different switch mounting positions This flexibility allows the microswitch to be positioned in such a manner t...

Page 19: ...he installation of you Edelbrock Nitrous System 6 0 Solenoid Inspection and Maintenance 1 Close valve on nitrous bottle 2 Make sure all nitrous supply lines are free of pressure before removal of any...

Page 20: ...itrous bottle valve not fully opened a Check bottle valve b Open valve fully 2 Nitrous bottle mounted improperly a Mount bottle properly Refer to Nitrous Bottle Mounting section 3 Plugged nitrous filt...

Page 21: ...ce temperature d Check bottle valve 1 Open valve fully e Check bottle orientation Refer to Bottle Mounting Orientation section 1 Mount bottle properly 7 Incorrect nitrous jetting a Compare jetting to...

Page 22: ...jet b Check bottle temperature and pressure 1 Ensure before every nitrous usage that you only use nitrous when the temperature and pressure of your bottle are correct Symptom 5 Vehicle surges under ac...

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