WINDOW 2984221 - Caterpillar

Table 1
Event Code
Description Conditions which Activate the Code System Response
E864 (1) Low Gas Fuel Differential Pressure The difference in fuel pressure between the inlet and the outlet of the fuel metering valve is less than the trip point. The delay time has expired. The alarm output is activated. The code is logged. Note: Refer to Troubleshooting, "Engine Monitoring System" for information on trip points and delay times.Probable Causes
Improper installation of the fuel metering valve
Low fuel supply pressure
Obstructed fuel supply
Obstructed fuel outletRecommended repairs
Check the Installation of the Fuel Metering Valve
An "E864 (1) Low Gas Fuel Differential Pressure" event will be generated if the fuel metering valve is installed backward. Ensure that the fuel metering valve is installed properly.Check the Gas Pressure Regulator
The fuel metering valve requires a minimum pressure of 10 kPa (1.5 psi) for the gas supply. Check the outlet pressure from the gas pressure regulator.Adjust the gas pressure regulator in order to achieve the correct pressure.If the gas pressure regulator cannot be adjusted to the correct setting, repair the regulator or replace the regulator.Check the Fuel Supply for Obstructions
Check the fuel filter for restriction. Replace the fuel filter, if necessary.Inspect the screen inside the inlet of the fuel metering valve for cleanliness. Clean the screen, if necessary.Inspect the fuel supply lines to the fuel metering valve for obstructions. Clean the lines and make repairs, as needed.Check the Gas Shutoff Valve (GSOV) for proper operation. Verify that the valve is fully open when the valve is energized. Verify that the GSOV does not stick in a partially open position. Repair the GSOV. Replace the GSOV, if necessary.Check the Fuel Outlet for Obstructions
Inspect the piping for obstructions between the fuel metering valve and the inlet to the turbocharger compressor.Clean the piping and make repairs, as needed.