Duramax
Injector Block-Off Tool KIT
fits
2001 - 2016 Chevy / GMC Duramax

Are you the local Duramax expert? Be prepared for any Dmax that rolls in the door with this three-piece injector block off tool kit.

- The cap on the left fits 2001 - 2005 LB7 and LLY
- The middle cap fits 2006 - 2010 LBZ and LMM
- The cap on the right fits 2011 - 2016 LML and LGH

INJECTOR BLOCK OFF TOOL NOTE:

The LB7 cap will also work on 2003 - 2007 5.9L Cummins. The LBZ/LMM cap

will also work on 2007 - 2017 6.7L Cummins applications.

The injector block off tool kit is a "must have" for anyone who works on Duramax common rail fuel systems.

When a Duramax common rail engine will not start, the very

first thing to check is fuel rail pressure. If the pressure is less than

spec, one of the most likely causes is a defective injector that

is returning excess fuel back to the tank. A return flow volume test

will verify if excessive return flow is the problem. A cap is then

used to identify the individual cylinder that is at fault. The injection

line is removed for one cylinder at a time and the cap installed on the

fuel rail in place of the injection line. When the cylinder with the

offending injector is capped, the rail pressure will rise and the truck

will start. In some cases it can be highly advantageous to have multiple

caps, because several injectors that return slightly too much fuel can

have the same effect as a single injector with extremely excessive

return flow. To purchase complete sets, see related items below.

Injector block off tools can also be useful for diagnosing engine

knocking sounds that may be attributable to an injector or a single

cylinder problem particularly on engines where this capability is not

available through the scan tool, or a bi-directional scan tool is not

available.

When working on high pressure fuel

systems, always educate yourself first by reading appropriate factory

service information, use common sense, and, above all, WEAR SAFETY

GOGGLES!

When working on high pressure fuel systems, always educate yourself first by reading appropriate factory service information, use common sense, and, above all, WEAR SAFETY GOGGLES!