2000 Chevy Blazer fuel gage doesn't register correctly

Tiny
BERNELL MALVEO
  • MEMBER
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Fuel gauge isn't registering correct amount of fuel in tank. I've been told that this might be because of faulty float cable running from fuel tank to bottom of fuse relay center under hood, or a bad fuel gauge itself, what do think is my problem?
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Sunday, August 31st, 2008 AT 11:18 AM

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Tiny
MERLIN2021
  • EXPERT
FUEL GAUGE INACCURATE OR INOPERATIVE 1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM TESTS. Go to next step. 2. Turn ignition switch to OFF position. Disconnect 6-pin chassis-to-engine in-line harness connector, located under vehicle, leading to fuel tank. Connect Signal Generator and Instrument Panel Tester (J33431-C) between male terminal side of connector terminal "E" (Purple wire) and terminal "D" (Orange/Black wire on 2.2L engines, Black wire on 4.3L engines). See Fig. 4 . Turn ignition switch to ON position. Vary resistance on J33431-C while observing fuel gauge on IPC. When resistance is near 40 ohms, fuel gauge should read EMPTY. When resistance is near 250 ohms, fuel gauge should read FULL. If operation is as specified, go to step 4 . If resistance is not as specified, go to next step. 3. Turn ignition switch to OFF position. Connect scan tool to DLC. Turn ignition switch to ON position. Vary resistance on J33431-C while observing FUEL TANK LEVEL REMAINING parameter in PCM data list. See FUEL TANK LEVEL SPECIFICATIONS table. If FUEL TANK LEVEL REMAINING parameter is according to specification, go to step 11 . If parameter is not as specified, go to step 5 . 4. Check for poor connection at fuel level sensor harness connector. Check for high resistance in Purple wire and Orange/Black wire (2.2L) or Black wire (4.3L) between 6-pin chassis-to-engine in-line harness connector and fuel level sensor. Check for a misaligned fuel level sensor. Check for a damaged/deformed fuel tank. Repair as necessary. If problem was found and repaired, go to step 13 . If problem was not found, go to step 7 . 5. Check for high resistance in Purple wire between 6-pin chassis-to-engine in-line harness connector and PCM. See WIRING DIAGRAMS . Repair wiring as necessary, then go to step 13 . If no problems are found, go to next step. 6. Check for high resistance in Orange/Black wire (2.2L) or Black wire (4.3L) between 6-pin chassis-to-engine in-line harness connector and PCM. See WIRING DIAGRAMS . Repair wiring as necessary, then go to step 13 . If no problems are found, go to step 9 . 7. Remove fuel level sensor. See FUEL PUMP under FUEL SYSTEM (GASOLINE) in REMOVAL, OVERHAUL & INSTALLATION - TRUCKS article in ENGINE PERFORMANCE. Check fuel level sensor for mechanical fault, damaged level arm or for fuel strainer interfering with level arm. Check fuel tank for foreign material. Repair as necessary, then go to step 13 . If no problems are found, go to next step. 8. Connect DVOM between fuel level sensor terminal "A" (Purple wire) and terminal "D" (Orange/Black wire on 2.2L, Black/White wire on 4.3L). Monitor resistance while moving level arm. If resistance changes smoothly (40-250 ohms) as arm is moved, system is functioning properly at this time. Check connections and wiring for intermittent faults. See WIRING DIAGRAMS . If resistance does not vary smoothly as level arm is moved, go to step 10 . 9. Check PCM connector for poor connection or corroded terminals. Repair connector as necessary, NOTE: Corroded connections or severed ground paths generally cause fuel gauge to register past FULL position. Short circuits to ground generally result in fuel gauge resting below EMPTY position. NOTE: After each repair procedure has been completed, reconnect all components. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK under SYSTEM TESTS. then go to step 13 . If no problems are found, go to step 12 . 10. Replace fuel level sensor. See FUEL PUMP under FUEL SYSTEM (GASOLINE) in REMOVAL, OVERHAUL & INSTALLATION - TRUCKS article in ENGINE PERFORMANCE. When repair is complete, go to step 13 . 11. Replace IPC. See INSTRUMENT PANEL CLUSTER under REMOVAL & INSTALLATION. When repair is complete, go to step 13 . 12. Replace PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION - TRUCKS article in ENGINE PERFORMANCE. When repair is complete, go to next step. 13. Using scan tool, clear PCM DTCs. Operate vehicle to verify proper fuel gauge operation. If fuel gauge operation is normal, repair is complete. If fuel gauge operation is faulty, go to step 2 .


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Sunday, August 31st, 2008 AT 12:32 PM

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