TM 1-1500-204-23-3 Table 2-9.  Typical Fuel System Troubleshooting Chart - CONT Trouble or symptom Isolation procedures Corrective action 4. Fuel quantity indicator d. Use a multimeter to check Replace or adjust gives incorrect defective or out of potentiometer. indication. adjustment fuel calibration (Continued) potentiometer. e. Visually check for loose or Cleanand tighten corroded connections. connections. 5. High resistance at pin Visually check for loose or Clean and tighten No. 28 or pin No. 35 of corroded connection of the connections. the fuel management transmitters. Panel connector (aircraft side). 6. High resistance at one Use a multimeter to check Replace transmitter if transmitter. for defective transmitter. defective. 7. Open circuit (infinite a. Use a multimeter to check Replace transmitter if resistance) at pin No. for defective transmitter. defective. 28 or 35 of fuel management panel connector (aircraft side). b. Use a multimeter to check Replace strap if broken bonding strap. defective. c. Use a multimeter to check Repair or replace wiring. for defective wiring. 8. Visual evidence of a. Visually check for defective Repair or replace cell. leaking fuel. fuel cell. b. Visually check for broken or Repair or replace line or cracked fuel line or hose. hose. 9. Fuel continues to flow Use a multimeter to check Replace valve if with firewall shutoff for defective firewall shutoff defective. Valve in closed valve. position. 10. Fuel will not Use a multimeter to check Replace valve if crossfeed. for defective fuel crossfeed defective. valve. 2-37