GM, GMC, Duramax Propane Injection System Installation Instructions, Diesel Performance Engine Products
Diesel  Propane Injection Systems

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GM Duramax Propane Injection System Installation Instructions - Fuel Savings

Step 1:

LB7- Remove plastic cover over top of engine. On drivers side you will see a ¼” hose attached to the boost tube. Unhook this line and attach it to the tee fitting. Attach hose supplied with this tee fitting to the boost tube outlet. Then, hook hose supplied with kit going to the top of the regulator

LLY- At the bottom of the passenger side intake housing. (The one that the intercooler pipe connects to) is the best place to drill and tap for 1/8’”pipe . It unbolts really easily and is easy to tap as well. If you are careful you can hide the boost line and fitting.

   
Step 2:

All Vehicles- Run 2 hoses from under the vehicle hood to regulator assembly. DO NOT CUT HOSES TO EQUAL LENGTHS, 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 harness from lock off valve under the dash. Hook ground wire from switch and wiring harness to a good ground. Plug yellow wire from the switch to the harness together. Hook red wire from switch harness to ignition power supply. This can be done using fuse tap supplied with this kit. (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.

 Diesel Propane Injection System Wiring Diagram Wiring Diagram

Diesel Propane Injection Systems Wiring
**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 Powershot 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.

Install Photos
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© 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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