TM  10-3930-638-24&P 3-4. FUEL SYSTEM TROUBLESHOOTING (cont) MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION 5.  ERRATIC  ENGINE  OPERATION  (SURGE,  MISFIRING,  POOR  GOVERNOR  REGULATION)  (cont) Step 3. Disconnect and remove fuel injector return lines (para 3-6a). Check  return  lines  for  clogged  condition. a. If fuel injector return lines are clogged, clean as described in paragraph 3-6a. After cleaning return lines, recheck to ensure that all foreign matter has been removed, then reinstall (para 3-6a). b. If fuel injector return lines are not clogged, proceed to step 4. Step 4. Disassemble fuel injection pump and check automatic advance components (para 4-3b; notify general support maintenance). a. If automatic advance components are worn or damaged, replace and adjust (para 4-3b). b. If automatic advance components are okay, proceed to step 5. Step 5. Disassemble fuel injection pump and check governor linkage for binding, foreign matter, and burrs; check metering valve for sticking condition (para 4-3b; notify general support maintenance). a. If linkage is binding or burred, replace (para 4-3b); if foreign matter is present, remove; if metering valve is sticking, replace (para 4-3b). b. If linkage and metering valve check okay and no foreign matter present, proceed to step 6. Step 6. Check that metering valve spring shim is installed (para 4-3b; notify general support maintenance). a. If metering valve spring shim is not installed, install (para 4-3b). b. If metering valve spring shim is installed, proceed to step 7. Step 7. Disassemble fuel injection pump and check governor parts and linkage for wear, sticking condition, or binding (para 4-3b; notify general support maintenance). a. If governor parts and linkage are worn, sticking, or binding replace (para 4-3b). b. If governor parts and linkage are okay, proceed to step 8. Step 8. Remove governor spring and inspect (para 4-3b; notify general support maintenance). a. If governor spring is broken or permanently set, replace (para 4-3b). b. If governor spring checks okay, proceed to step 9. Step  9.  Check  governor  linkage  hook  for  correct  adjustment  (para  4-3b;  notify  general  support  maintenance). a. If governor linkage hook is not adjusted properly, adjust as described in para 4-3b. b. If governor linkage hook is adjusted properly, proceed to step 10. 3-11