TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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REFERENCE -I i INFORMATION TM 9-2320-387-24-l FUEL SYSTEM A 1 . CAUTION Be sure to keep the line clear of moving engine parts (fan, pulleys, etc.) and DO NOT place the line on the exhaust manifold. Replace fuel lines (para. 3-26). Check the filter vent screw for tightness. Check the supply lines for kinks, cracks. leaks, or loose connections that could restrict fuel flow or allow air to enter the system. Remember that under certain operating conditions parts of the fuel system can be under vacuum so that loose connections that may not leak fuel can let air in. To test for air leaks in the supply lines, disconnect the return line from the injection pump and connect a line that is long enough to reach the ground. Place the end of the line into a bucket containing diesel fuel, making sure that the end of the line is below the level of fuel in the bucket. Run the engine and watch for air bubbles in the bucket. You can also replace the short return line from the injector pump with a clear piece of tubing to check for bubbles. Inspect the return lines for kinks or any other blockage that may restrict fuel flow. Inspect fuel return check valve for any restrictions (para. 3-36). Replace fuel line (para. 3-26). 2-123