Propane injection system diesel installation instructions for trucks, 18 wheeler
Diesel  Propane Injection Systems

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Installation Instructions

General Install Instructions

Step 1: Tee into the boost pressure gauge port, with the boost pressure line brass adapter tee. Label hose "attach to top of regulator." If no boost gauge port is present, locate a proper boost source or determine intercooler entry points, drill and tap 1/8 inch pipe threads into intercooler, approx. one inch forward of boost tube and hose clamp assembly. Install 1/8 inch pipe to 1/4 inch hose fitting (included), attach hose going to the top of the regulator to this fitting. ***IMPORTANT *** Remove boost tube and clean to remove any metal particles from drilling and tapping before proceeding to Step 2****Vehicles without intercooler, determine best boost source and drill and tap 1/8” pipe threads.
   
Step 2: Run 2 hoses from under the vehicle hood to truck bed. Do not cut hoses to equal length, one will be longer, run boost pressure line first. ***IMPORTANT*** MARK HOSES AT BOTH ENDS AS FOLLOWS: ONE-LP FUEL THE OTHER-BOOST PSI Attach BOOST PSI hose to adapter fitting “tee.” At the tank, attach BOOST PSI line to the top of the regulator. Attach Fuel line to the end of the regulator fuel out fitting.
   
Step 3: Remove air filter cover and air filter indicator, being sure to keep the rubber grommet. Run the fuel hose through the grommet making the fuel hose run down the inlet hose approx. 1 foot toward the turbo. (***Note - If truck is equipped with Mass airflow sensor, route the hose around the sensor. ****) Reinstall air filter cover.
   
Step 4:

Run wire from fuel regulator in the bed of the truck, under the dash. Ground the black wire under the dash. Hook the white wire to the switch. Run power wire from ignition switch located on the steering column to the fuse holder. Attach the ground wire from the lock off valve and power switch to a proper ground. Hook yellow wire to white wire from lock off valve (see diagram)
THIS POWER SUPPLY MUST TURN ON AND OFF WITH THE IGNITION SWITCH. 12 VOLT POWER WITH KEY ON, NO POWER WITH KEY OFF. The dual switches under the dash will be used to turn system on and off and must be re- activated each time the vehicle is started by the momentary rocker switch. Power switch is illuminated when system is activated.

Propane Injection Wiring Diagram

Propane Injection Switch
**Screws are provided for switch mounting**

   
Step 5: Secure all lines to frame rail keeping them clear of any moving parts. Leave a slight amount of slack in the hoses and wires leading from the bed of the truck to under the cab area. Truck beds are independent of cabs and can and do move.
   
Step 6: VERY IMPORTANT!!!! ALWAYS SECURE A VERTICAL TANK IN THE UPRIGHT POSITION ONLY!!!!! NEVER ALLOW THE TANK TO TIP OVER. THIS WILL ALLOW FOR THE FEED OF LIQUID PROPANE DIRECTLY TO THE ENGINE. DAMAGE CAN OCCUR. CHECK SYSTEM FOR ANY LEAKS BEFORE INITIAL VEHICLE OPERATION AND CHECK HOSES AND WIRES PERIODACLLY.
   
  ***This propane kit is intended to optimize the performance of your turbo-charged diesel engine. It is not recommended to operate a diesel engine at maximum power for extended periods. Improper use of propane injection may cause damage to the engine and/or void the manufacturer’s warranty coverage. As with any aftermarket performance product designed to increase torque and horsepower, the user and purchaser assumes all risks and liabilities associated with and resulting from the installation and use of this product. ****

CUSTOMERS WITH UNDERVEHICLE TANKS - USE CAUTION WHEN REFILLING YOUR TANK TO AVOID OVERFILLING WHICH COULD LEAD TO LIQUID PROPANE ENTERING THE REGULATOR

Your propane injection system has been shipped to you preset for your vehicle and to the specifications indicated when you placed your order. Your starting time and flow rates are noted on the packaging. No initial adjustments should be necessary after installation. Just install it and go!!! If you need to change the settings for another application, (such as towing, which generally requires a later start time than the stock setting) please follow the instructions here.


© DIESEL PERFORMANCE PRODUCTS
4x4, TRUCK, SUV & FLEET ENGINE PERFORMANCE PARTS / PROPANE INJECTION SYSTEMS
Photos Courtesy Chevrolet®, Dave Huntoon & Diesel Performance Products

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