FILTER GP-FUEL 1454501 - Caterpillar

Either too much fuel or not enough fuel for combustion can be the cause of a problem in the fuel system. Work is often done on the fuel system when the problem is really with some other part of the engine. Finding the source of the problem is difficult, especially when smoke comes from the exhaust. When noticeable smoke rises from the exhaust, this problem can be caused by a damaged unit injector. This unusual smoke can also be caused by one or more of the reasons that follow:
Not enough air for good combustion
An overload at high altitude
Oil leakage into combustion chamber
Not enough compression
Incorrect fuel injection timing
Cold engine operation
Low cetane fuel
Illustration 1 g00430179
Fuel system components (1) Fuel filter base (2) Fuel line from ECM (3) Fuel priming pump (4) Fuel filter (5) ECM
Illustration 2 g00430180
Fuel system components (6) Fuel supply and return manifold (7) Fuel transfer pump (8) Fuel line (fuel transfer pump to ECM)Fuel System Inspection
A problem with the components that send fuel to the engine can cause low fuel pressure. This can decrease engine performance.
Check the fuel level in the fuel tank. Make sure that the vent in the cap is not filled with dirt.
Check all fuel lines for fuel leakage. The fuel lines must be free from restrictions and damaged bends. Verify that the fuel return line is not collapsed.
Install a new fuel filter.
Remove any air that may be in the fuel system. Refer to Testing and Adjusting, "Procedure for Fuel Priming" for more information.Fuel Transfer Pump
When the engine is operating at the rated rpm and load condition, the fuel transfer pump moves the fuel through the following components:
ECM
Fuel filter base
Fuel supply and return manifoldsAn orificed valve in the return fuel manifold restricts fuel flow. A pressure regulator valve is in the transfer pump. The normal fuel pressure is 630 kPa (91 psi) at rated rpm. If the fuel pressure is low 517 kPa (75 psi) or less, stop the engine. Replace the fuel filter. Check the fuel lines in order to ensure that the fuel lines are not plugged. Make sure that the fuel lines are not damaged. Start the engine and again check the fuel pressure. If the fuel pressure is still low, check the fuel regulator valve in the fuel transfer pump.Stop the engine if the fuel pressure is at 690 kPa (100 psi) or above 690 kPa (100 psi). Remove the orificed valve from the connector. The valve is directly behind the return line fitting. Check for debris that is plugging the orifice holes near the tip. If the orifice holes are plugged, flush any remaining debris from the return passage. Then check the source of debris. If the orifice holes are not plugged, check for a plugged return fuel line. If the return fuel line is not plugged, check the regulator valve in the fuel transfer pump for debris or for rust.Fuel Pressure
Table 1
Required Tools    
Part Number     Part Name     Quantity    
1U-5470     Engine Pressure Group