TM 5-3895-383-24
Fuel Pressure
Tools Needed
1U5470
Engine Pressure Group
1
3Y2888
Adapter (9/16 -18 to 1/8 NPT)
1
3J1907
O-ring Seal
1
NOTE:
5P2720 Self-Sealing Probe Adapter and 5P2718
Pressure Probe may be used with the tools
needed, to allow installation of pressure probes in
the future.
1U5470 Engine Pressure Group
The 1U5470 Engine Pressure Group can be used to check
engine fuel pressures.
This tool group has a gauge to read fuel pressure to the
cylinder head. Special Instruction, SEHS8907 is with the tool
group and gives information for its use.
Fuel Return Line (Type II)
(1) Cylinder head. (2) Pressure regulating orifice. (3) Tube
assembly (return to tank from cylinder head fuel gallery). (4)
Check valve assembly. (5) Pressure relief valve. (6) Fuel
outlet port (to tank). (7) Fuel gallery.
The fuel pressure to the cylinder head fuel gallery (7) should
be 140 to 400 kPa (29 to 58 psi) at rated rpm and load
condition. At low idle, the pressure regulating orifice (2) in tube
assembly (3) maintains a minimum fuel pressure of 50 kPa
(7.2 psi) to the injectors. Check valve (4) prevents fuel from
leaving the cylinder head fuel gallery during shutdown.
6-58
