SEAL 3G2240 - Caterpillar

Table 1
Event Code     Description     Default Set Point     Delay Time in Seconds    
E1127     Low pressure at the intake of the fuel filter (suction side)    
−30 kPa (−4.4 psi)     120    
E1128     High pressure at the intake of the fuel filter (suction side)    
69 kPa (10 psi)     30    
E1129     Restriction at the fuel filter (suction side)     Fuel pressure at the inlet of the transfer pump
−45 kPa (−6.5 psi) or Primary fuel filter differential pressure
103 kPa (15 psi)     120    
Illustration 1 g01812194
(1) Inlet to the transfer pump (2) Inlet to the fuel filter (3) Supply from tank (4) Return to tank
The inlet pressure to the fuel transfer pump must maintain a minimum pressure of −45 kPa (−6.5 psi) at inlet (1) .
The maximum allowed supply pressure at inlet (2) is 69 kPa (10 psi). Keep the supply pressure close to 60 kPa (8.7 psi) in order to maximize the life of the fuel filters. Supply pressures above 60 kPa (8.7 psi) but below 69 kPa (10 psi) are recommended. Supply pressures above 69 kPa (10 psi) will damage the lip seal in the transfer pump.
The minimum allowed supply pressure at inlet (2) is −30 kPa (−4.4 psi).
An auxiliary pump may be used to supply fuel to the engine at the required flow and pressure. The auxiliary pump must be a positive displacement pump. The pump must supply the engine with the required flow. The system must supply up to 41 L/min (10.8 US gpm). The system must also maintain the required inlet pressure. The pressure requirements are also available in Technical Marketing Information (TMI), located in the systems data. Fuel quality and proper handling of the fuel system components is an essential part of the reliability and durability of the fuel system. Refer to the following publications for additional information:
Reuse and Salvage Guidelines, SEBF9109, "Handling Procedures for the Components of the Common Rail Fuel System"
Special Publication, SEBU6251, "Caterpillar Commercial Diesel Engine Fluids Recommendations"
For additional information on fuel transfer systems, refer to Application and Installation Guidelines, LEBW4976.