6 solenoid / soft plume nozzle hose connection, 7 nitrous feed line mounting, 8 fuel supply connection – Holley 02121NOS User Manual

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Figure 6

Mount the solenoid assembly to the driver’s side foremost valve cover bolt. See Figure 6. Ensure that the assembly and
lines do not interfere with engine accessories or body parts, and that hoses reach the Soft Plume nozzle inlet ports without
being stretched or kinked.

8.

9.

Securely mount the solenoid assembly.

2.6 Solenoid / Soft Plume Nozzle Hose Connection

1. Select the proper nitrous and fuel jets (13-16). Place the desired jets in the Soft Plume nozzle, making sure that the jets are

inserted into the correct locations, as marked on the nozzle.


2. Connect and tighten the open end of the blue 2 ft. 3AN hose (17) to the Soft Plume nozzle inlet port marked “nitrous”. Hold

the Soft Plume nozzle in position with a wrench to ensure the nozzle doesn’t rotate out of position when the line is
tightened.


3. Connect and tighten the open end of the red 2 ft. 3AN hose (18) to the Soft Plume nozzle inlet port marked “fuel”. Hold the

Soft Plume nozzle in position with a wrench to ensure the nozzle doesn’t rotate out of position when the line is tightened.

2.7 Nitrous Feed Line Mounting

HINT: Most late model vehicles have access plugs in the trunk floor, which are convenient for nitrous line routing. Following

the fuel lines along the underbody, and entering the engine bay through the front fender well between the plastic inner
fender panel and the body usually works well.

1. Determine the route for your nitrous feed line to follow. Ensure the path is clear of exhaust system, suspension, steering,

wheels, electrical lines and components, and tires.


2. Feed the nitrous supply line (19) along the proposed route.

3. If it is necessary to support the nitrous supply line under the vehicle, use 1/2” Tinnerman clamps or nylon tie-wraps to

support the line securely.


4. Attach the nitrous supply line to the 4AN bottle nut adapter (1) on the nitrous bottle.

WARNING! Nitrous oxide can cause death if inhaled. Severe frostbite can occur, if allowed to contact the skin.

Always point the nitrous line opening away from people when purging the line.


5. Attach the nitrous supply line to the filter installed in the nitrous solenoid inlet port.

2.8 Fuel Supply Connection


1. Remove the fuel pressure sensor from the fuel rail. This sensor is located on the driver’s side of the engine and is attached

to the fuel rail with two 8mm headed bolts. See Figure 7.


WARNING! Do not use Teflon Tape on any pipe threads. Pieces of Teflon tape can break loose and become lodged in

nitrous or fuel solenoids or solenoid filters. Debris lodged in a nitrous or fuel solenoid can cause
catastrophic engine failure.

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