UNION 2H9091 - Caterpillar

The 1U-5470 Engine Pressure Group can be used to check the engine's fuel pressures.
Illustration 1 g00284796
1U-5470 Engine Pressure Group
(1) Pressure indicators
(2) Zero adjustment screw
(3) Pressure indicator
(4) Pressure tap
(5) Pressure indicatorThis tool group has an indicator that is used to read the pressure in the fuel manifolds. The Special Instruction, SEHS8907 is with the tool group.
Illustration 2 g00284797
Fuel manifold and lines
(6) Fuel supply line to cylinder head
(7) Fuel manifold
Illustration 3 g00284798
Fuel transfer and filter differential pressures (typical example)
(8) Fuel inlet line to priming pump
(9) Line from filters to fuel manifolds (filtered fuel)
(10) Plug
(11) Fuel priming pump
(12) Fuel filter differential pressure switch
(13) Fuel line from transfer pump
(14) Fuel priming pump adapter
(15) Fuel filterThe fuel pressure regulating valve keeps the pressure in fuel manifolds (7) between 415 to 450 kPa (60 to 65 psi). Disconnect one of the fuel supply lines (6). Install a tee between the line and the manifold to check the pressure in the fuel manifold. Connect the 1U-5470 Engine Pressure Group to the tee and operate the engine at rated speed and load.The outlet pressure of the fuel transfer pump can be checked at the location of plug (10) in fuel priming pump adapter (14).Fuel filter differential pressure switch (12) is located in fuel priming pump adapter (14).