BOOT 8P3083 - Caterpillar

Illustration 1 g06089454
(1) Fuel return line from the fuel injectors
(2) Fuel manifold
Illustration 2 g06089421
Alternate injector bypass fuel flow line of 20 cylinder engine
(3) Fuel return line from the fuel injectors
(4) Low-pressure fuel line
Illustration 3 g06089432
Alternate injector bypass fuel flow line of 16 cylinder engine
(5) Fuel return line from the fuel injectors
(6) Low-pressure fuel line
Disconnect the fuel injector fuel return line (1) from fuel manifold (2) at the high-pressure fuel pump or from the alternate line (3) or (5) on the low-pressure fuel system. Obtain a piece of plastic tubing that can be attached to the end of the return line. Connect one end of the tubing to the loose return line. Place the other end of the tube into a suitable container that can be used to measure the fuel discharge from the return line.
Plug the fitting where the injector bypass fuel flow line was connected (2), (4), or (6). Plugging will ensure no fuel sprays out when the engine is started.
Start the engine. Allow the engine to stabilize at a steady engine rpm.
Illustration 4 g02246114
Injector bypass fuel flow that is allowable for the engine
Note: During engine cranking, the flow