TM 5-3805-261-20FUEL SYSTEM TROUBLESHOOTING AND MAINTENANCE PROCEDURES. (cont)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONb.ENGINE MISFIRES OR RUNS ROUGHLY. (cont)Step 4. Check for clogged primary fuel filter (Figure 6-28).Disconnect fuel line between fuel filter and fuel injection pump housing at fuel injection pump housing.Place start switch in the ON position and crank engine. Refer to TM 5- 3805-261-10.Figure 6-28.If fuel does not shoot out from disconnected--replace primary fuel filter. Refer to paragraph 6-25.6-40
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