General Motors Fuel Injection Instruction Sheets PDF Print E-mail

This is the instruction sheet for the GM, Buick, Pontiac, Vortec, Jeep, Cadillac and Corvette vehicles.


Mounting the nitrous bottle

1. Mount the nitrous bottle with the tall bracket at the top of the bottle and the short bracket at the bottom.

2. Position the bottle in the trunk or hatch to one side of the car with the valve end facing the front of the car. The outlet of the bottle must be pointing down and higher than the bottom of the bottle. (If it is necessary to mount the bottle sideways keep the bottle valve up and turned slightly to the back of the car).

3. Check under the car in the area where the bottle is to be mounted for any fuel or electrical wires. DO NOT DRILL INTO THE GAS TANK OR ELECTRICAL LINES!!!

4. Mark and drill (4) four 3/8" holes and bolt the bottle to the floor of the trunk.

Supply line installation

1. Drill a 5/8" holes below the bottle valve or locate a drain plug grommet in the area or the bottle valve and route the supply line under the car. Be sure to tape up the ends of the line to avoid any trash or dirt getting into the line.

2. Route the supply line along the chassis away from any moving parts or exhaust heat, routing along the brake lines is most common, wire tying along the way.

3. Finish routing the supply line under the hood away from the exhaust manifolds and any electrical wires. Leave a little slack in the line to allow for engine movement.

4. Mount the nitrous filter keeping in mind the direction of flow noted on the filter toward the motor. Install the 1 foot line to the outlet side of the filter and connect it to the "IN" side of the nitrous solenoid.

Locating your diagnostic test port

Most late model fuel injected cars have a perfect place to tap in for your fuel supply for your new COMPUCAR Nitrous System. There exists a diagnostic test port somewhere along the fuel supply line (always in the engine compartment), or on the fuel injector rail itself. By using the diagnostic port, it eliminates any need to splice into any of the stock fuel lines. In some cases where a diagnostic port is not found, it will then become necessary to splice into the supply side of your stock fuel injection line. If this should be the case in your installation, consult either a reputable automotive shop or your dealer for proper identification of supply line.

To find your diagnostic port, follow your fuel line to the fuel rail, looking for a plastic cap, similar to that of a tire valve stem. General Motors and Chrysler products have a diagnostic port similar to that of an air conditioning charging port. Simply remove the core with a tire stem tool.

Test Port Locations-Most Popular Cars

Buick Grand National--drivers side of intake at the end of the fuel rail

Chrysler & Mitsubishi 2.6 4 cylinder turbo-center of engine behind air cleaner, or center of engine close to the throttle body.

Pontiac & Chevrolet 2.8 MFI V6-drivers side of the fuel feed line.

If locating the fuel diagnostic test port becomes a problem, call our tech line for assistance or contact your local dealer.

Blaster Nozzle installation

The blaster nozzle may be located on either side of the throttle body. Normal recommendations though is to locate the nozzle in the rubber or steel tube about 1 1/2" before the throttle body at a 9:00 o'clock or 3:00 o'clock level. DO NOT MOUNT STRAIGHT UP OR YOU MAY NOT BE ABLE TO CLOSE YOUR HOOD!

Once the location has been decided, drill a 1/4" hole for the nozzle into the rubber tube. CAREFULLY insert the nozzle into the hole and screw in by hand. If the tube is made of steel or hard plastic, drill a 11/32" hole into the tube and tap with a 1/8" pipe tap and install the nozzle.

Choosing your systems horsepower

In your kit is an envelope with Blaster jets and a jet card. Choose the horsepower setting you wish to start with and install each carefully in the Blaster nozzle. Make sure you install the Nitrous jet in the port marked "N" and the Gas jet in the port marked "G". DO NOT USE ANY SEALANT ON EITHER SIDE OF THE JET THREADS!!

Installing solenoid bracket and output lines

Locate the two short braided lines in the kit with the same length that attach to your Blaster jets. Also, locate the two fittings in your kit that will attach to these braided lines. Install the two fittings into the solenoids "outlet" ports using pipe sealant. DO NOT USE TEFLON TAPE!! Locate the fitting in your kit that will attach to your supply line from the bottle and install it in the "inlet" port of your nitrous solenoid. Your solenoids are marked on the bottom of the base with a "N" for nitrous and "G" for gas. Install the remaining fitting into the "inlet" port of the gas solenoid.

Connect the short braided lines to the solenoid outlet fittings.

Connect the other end of these lines to the Blaster jets, previously installed. MAKE SURE NITROUS SOLENOID LINE GOES TO NITROUS JET AND THE GAS SOLENOID LINE GOES TO GAS JET.

Locate the aluminum solenoid bracket and the four small screws included. Mount the solenoids on the bracket and then mount the bracket to the chassis.

Fuel line connection

In the beginning of this sheet, you were told how to locate and modify your test port. Now, locate in your kit the last remaining braided line and attach it to the inlet port of your gas solenoid and the other end to your modified fuel test port.

Electrical Wiring

1. Your 12V source should be taken from the fuse panel marked "accessory". This will ensure the nitrous cannot be activated with the engine off.

2. On high horsepower racing systems more amperage is required, and the 12v source should be taken directly from the battery using 12 gauge wire.

3. Take one wire from each solenoid and ground to the engine block.

4. Take the remaining two wires and run them inside the car to one terminal on your push button switch.

5. Run a wire from the other terminal of your push button to one terminal on your toggle switch. From the other terminal on your toggle switch run a wire to the fuse panel.

Final system check up

With the electrical wiring complete, untape the end of your nitrous supply line and anchor the end of the line. Turn your bottle on for 3 seconds to clear any trash that may have gotten into the line. Hook your nitrous line up immediately after doing this to your nitrous solenoid. Open the bottle valve again and check for any leaks, tighten any fittings again that are leaking.

Start the engine and check ALL FUEL side connections for leaks. Now start your engine and allow it to warm up. If the engines idles smoothly, open the nitrous valve FULLY and head for the closest test track.


*SPECIAL NOTE* Compucar solenoids have a bubble tight seal, but as added precaution close the nitrous bottle valve when the engine is not running.