High Fuel Temperature Return; High Fuel Temperature Resolution; Test The Engine With Resolved High Fuel Temperature - Detroit Diesel EPA07 Series 60 DDEC VI Troubleshooting Manual

12.5

HIGH FUEL TEMPERATURE RETURN

12.5 HIGH FUEL TEMPERATURE RETURN
To determine if high fuel temperature return is causing lack of power, perform the following steps:
1. Test for high fuel temperature return.
2. Analyze the high fuel temperature test results.
[a] If the return fuel temperature is less than or equal to 54°C (130°F), check for air
cleaner restriction; refer to section 12.6.
[b] If the return fuel temperature is greater than 54°C (130°F), resolve the high fuel
temperature return condition; refer to section 12.5.1.
12.5.1

High Fuel Temperature Resolution

Perform the following steps to resolve high fuel temperature return:
1. Remove and replace fuel filter(s); refer to Series 60 Service manual (6SE2007), fuel
system chapter.
2. Inspect the combination check valve/regulator, replace if necessary; refer to Series 60
Service manual (6SE2007), fuel system chapter.
3. If equipped with a fuel cooler, refer to OEM for inspection guidelines.
4. Verify high fuel temperature repair; refer to section 12.5.1.1.
12.5.1.1

Test the Engine with Resolved High Fuel Temperature

Perform the following steps to determine if high fuel temperature repairs resolved lack of power
condition:
To avoid injury before starting and running the engine,
ensure the vehicle is parked on a level surface, parking
brake is set, and the wheels are blocked.
To avoid injury from inhaling engine exhaust, always
operate the engine in a well-ventilated area.
exhaust is toxic.
1. Start and run the engine.
2. Test drive the vehicle to ensure lack of power has been resolved.
12-16
ENGINE EXHAUST
Engine
All information subject to change without notice.
Copyright © 2007 DETROIT DIESEL CORPORATION