3516B and 3516C Engines For MT4400D AC Off-Highway Trucks Caterpillar

Fuel Pressure Is Low

Usage:

Use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes and the default trip points for this code. access the monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip point for this code.

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Table 1
Event Codes
Description	Default Conditions which Generate this Code	System Response
E198(1) Low Fuel Pressure - least severe	The fuel pressure drops below the trip point for the specified delay time.	The code is logged.
E198(2) Low Fuel Pressure - moderate severity		The code is logged.
5580-17 Engine Filtered Fuel Absolute Pressure : Low - least severe (1)	The fuel pressure drops below the trip point for the specified delay time.	The code is logged.
5580-18 Engine Filtered Fuel Absolute Pressure : Low - moderate severity (2)	The fuel pressure drops below the trip point for the specified delay time.	The code is logged.

Probable Causes

Fuel tank cap
Fuel pressure regulating valve
Fuel pressure relief valve
Fuel level

Recommended Actions

Fuel Tank Cap

Check the vent in the fuel tank cap. Clear any restrictions with compressed air.

Fuel Pressure Regulating Valve

A fuel pressure regulating valve that is stuck in the open position may cause low fuel pressure. If a problem is suspected, inspect the return fuel pressure regulating valve. Clean any contamination or debris that may keep the regulating valve open. If debris is present, find the source of the contamination. Replace the return fuel pressure regulating valve if the valve is worn or damaged. Refer to Systems Operation/Testing and Adjusting for information that is related to the fuel pressure regulating valve.

Fuel Pressure Relief Valve

Inspect the fuel pressure relief valve in the fuel transfer pump. Check the valve and the valve seat for debris. Make sure that the valve is not stuck in the open position.