What is supply side restriction on Duramax LBZ?
What is supply side restriction on Duramax LBZ?
Supply side restriction runs normally in the 2-4” hg range on this gauge. If it is any higher than 4”hg start with a fresh filter. If the restriction does not improve then you will need to trace lines back to tank from the filter housing and possibly open the tank to inspect the pickup assembly.
Where is the fuel pump located in a Duramax Diesel?
The mechanical h.p. pump located in the engine valley is the only pump, it has the duel function of pulling fuel from all the way from the tank and thru the filter and cooling the ficm to the h.p. section of the pump. This means the entire fuel line, tank to engine, is under suction YOU WONT SEE A LEAK , you might see a wet stain.
Why is my Duramax LBZ engine leaking fluid?
The cooler lines are responsible for circulating transmission coolant to keep the tranny from overheating which is important for reliability and longevity. The lines on the Duramax LBZ have a design fault at the “crimp” to where the crimp isn’t suitable enough to hold onto the line and prevent fluid from leaking.
What makes the Duramax LBZ engine so reliable?
Unless you are looking to break the 600rwhp barrier, the Duramax LBZ engine is extremely reliable. The tune-only power capabilities combined with its reliability are what make the LBZ the most sought after Duramax today, nearly 14 years after it stopped production.
Where does the fuel go in a Duramax?
There is no lift pump in the fuel tanks or on the frame. The fuel passes through the base plate of the fuel injector control module (FICM) to cool the module. From the FICM the fuel flows to the fuel filter assembly, which combines a water separator, a prime pump and a filter element.
What is the balance rate on a Duramax?
Starting on 2006 all Duramax injectors use an injection quantity adjustment number on top. This is established by Bosch during testing. This number is stored in the ECM and the ECM uses it to further fine tune fuel delivery. Most trucks 06 and newer, the balance rates will be +/- 1mm3 or less.
How to check high pressure pump in GMC diesel?
Buy Fuel Pressure Regulator 2 Unplug the fuel pressure regulator 2 (pressure control valve in left hand rail) electrical connector. Crank the engine for 15 seconds and verify there is a steady flow of fuel from the fitting on the rail. If there is not, proceed to checking/replacing the high pressure pump.
What causes a negative fuel trim number on a Duramax?
Think of it like fuel trim, just on a cylinder by cylinder basis. If a injector is leaking, too much fuel gets into the cylinder. This will cause the piston to speed up faster than the other cylinders. The ECM monitors the crankshaft revolutions. When it sees the unusual increase in speed, it reduces fuel and a negative fuel trim number appears.
