C-10 and C-12 Truck Engines Caterpillar


Fuel Lines

Usage:

C-12 1YN

Low Pressure Fuel System with Integral Pressure Regulator Valve

Type 1



Illustration 1g01432231
Fuel filter base with integral pressure regulator valve
Typical example

(1) Fuel manifold

(2) Integral pressure regulator valve

104-1729 Spring

Assembled length ... 18.37 mm (0.723 inch)
Operating length (minimum) ... 15.37 mm (0.605 inch)
Free length after test ... 30.2 ± 0.7 mm (1.19 ± 0.03 inch)
Outside diameter ... 11.29 mm (0.444 inch)

(3) Supply hose assembly

(4) Stud

Apply 155-0695 Thread Lock Compound on the taperlock end of the stud to the following length. ... 7.6 mm (0.30 inch)
Tighten the stud to the following torque. ... 70 ± 15 N·m (50 ± 11 lb ft)

(5) Plug (filtered fuel pressure)

Type 2



Illustration 2g01432235
Fuel filter base and fuel adapter with integral pressure regulator valve
Typical example

(6) Fuel manifold

(7) Integral pressure regulator valve

104-1729 Spring

Assembled length ... 18.37 mm (0.723 inch)
Operating length (minimum) ... 15.37 mm (0.605 inch)
Free length after test ... 30.2 ± 0.7 mm (1.19 ± 0.03 inch)
Outside diameter ... 11.29 mm (0.444 inch)

(8) Supply hose assembly

(9) Stud

Apply 155-0695 Thread Lock Compound on the taperlock end of the stud to the following length. ... 7.6 mm (0.30 inch)
Tighten the stud to the following torque. ... 70 ± 15 N·m (50 ± 11 lb ft)

(10) Plug (filtered fuel pressure)

Low Pressure Fuel System with Pressure Regulator Assembly that is Self-Contained

Type 1



Illustration 3g01432237
Fuel filter base with pressure regulator assembly that is self-contained
Typical example

(11) Fuel manifold

(12) Pressure regulator assembly

(13) Supply hose assembly

(14) Stud

Apply 155-0695 Thread Lock Compound on the taperlock end of the stud to the following length. ... 7.6 mm (0.30 inch)
Tighten the stud to the following torque. ... 70 ± 15 N·m (50 ± 11 lb ft)

(15) Plug (filtered fuel pressure)

(16) Ball valve assembly

(17) Backflow check valve

Type 2



Illustration 4g01432238
Fuel filter base and fuel adapter with pressure regulator assembly that is self-contained
Typical example

(18) Fuel manifold

(19) Pressure regulator assembly

(20) Supply hose assembly

(21) Plug (filtered fuel pressure)

(22) Ball valve assembly

(23) Backflow check valve

(24) Stud

Apply 155-0695 Thread Lock Compound on the taperlock end of the stud to the following length. ... 7.6 mm (0.30 inch)
Tighten the stud to the following torque. ... 70 ± 15 N·m (50 ± 11 lb ft)

Thermal Bypass Valve (if equipped)



Illustration 5g01432243

(25) The return fuel system may be equipped with a thermal bypass valve. The thermal bypass valve returns fuel that has been heated by the engine to the inlet of the fuel transfer pump. This valve is actuated by the temperature of the fuel.

The valve starts to close at the following temperature. ... 70 °C (158 °F)

The valve is fully closed at the following temperature. ... 80 °C (176 °F)

The maximum operating temperature of the valve is at the following temperature. ... 120 °C (248 °F)

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