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fuel gauge reads full all the time 2000 chevy s10

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2000 Ford Windstar INCORRECT FUEL GAUGE INDICATION Workshop Manual

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The fuel gauge does not change indication unless there has been at least 3 gallons of fuel added or deleted between ignition switch cycle. Use recorded REM and instrument cluster DTCs from the Continuous and On- Demand self-test. ? Are any DTCs recorded? Yes If REM DTC B1201 or IC DTC U1131 is retrieved, GO to D6 . No GO to D2. D2 CARRY OUT THE ICM FUEL GAUGE ACTIVE COMMAND IC Active Command Select the IC FUEL GAUGE CONTROL active command. Trigger FUELLEVEL active command. Toggle and monitor the fuel gauge while adjusting the FUELLEVEL active command to read 50% and 100% Did the fuel gauge needle start at empty (E), move to half at 50%, and full (F) at 100%? Yes GO to D3. No INSTALL a new instrument cluster; REFER to Instrument Cluster. CLEAR the DTC. REPEAT the instrument cluster self-test. D3 CHECK THE FUEL GAUGE READING Fuel Pump Module C412 Connect one lead of Instrument Gauge System Tester to fuel pump module C412 Pin 5, Circuit 1357 (LB/YE), harness side. Connect the other lead to fuel pump module C412 Pin 8, Circuit 1356 (LG/VT), harness side. Set the power switch on Instrument Gauge System Tester to the ON position Set Instrument Gauge System Tester to 15 ohms. Wait one minute. Set Instrument Gauge System Tester to 160 ohms. Wait one minute. Read the fuel gauge. The fuel gauge should read full or above. Set Instrument Gauge System Tester to 15 ohms. Wait one minute. Read the fuel gauge. The fuel gauge should read empty or below Does the fuel gauge operate correctly? Yes GO to D4. No GO to D6. D4 INSPECT THE FUEL TANK Visually inspect the fuel tank for any damage or deformation. ? Is the fuel tank OK? Yes GO to D5. No INSTALL a new fuel tank. REFER to Section 310-01. TEST the system for normal operation. D5 INSPECT THE FUEL LEVEL SENSOR AND PUMP ASSEMBLY Visually inspect the fuel pump assembly for damaged wiring or connectors. Visually inspect the float and float rod for damage or obstruction

1998-1999 Chevrolet and GMC S/T Pickup and 2 Door Utility Incorrect Fuel Gauge Readings

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Condition Some owners may comment on incorrect fuel gauge readings. The fuel gauge may read empty (E) with approximately 1/3 of a tank of fuel remaining, or the fuel gauge rarely reaches the full (F) mark when the fuel tank is filled. Correction Reprogram the vehicle control module (VCM) with the revised Fuel System Calibration. Use the appropriate calibration listed below. Refer to the latest Techline information for programming procedures. Calibration Information Important: These calibrations are not available from GMSPO. These calibrations are available Subject: Incorrect Fuel Gauge Readings (Reprogram Vehicle Control Module with Revised Calibration) Models: 1998*-99 Chevrolet and GMC S/T Pickup and 2 Door Utility Models 1998*-99 Isuzu Hombre with 4.3L Engine (VINs W, X – RPOs L35, LF6) *RPO ZN4 Only Plant Division VIN Breakpoint Linden Chevrolet (Blazer) XK162355 Linden GMC (Pickup) XK508493 Linden GMC (Jimmy) XK508505 Shreveport Chevrolet X8140835 Shreveport GMC X8512385 Shreveport Isuzu (RPO ZN4 W8668201-W8670669 Shreveport Isuzu X8650007-X8650733 Calibration P/N (New) Application 09374032 (Fuel System Calibration) S/T 100 (Pickup) &LF6/L35 09374033 (Fuel System Calibration)

1984-1995 Honda Accord/Prelude In­Tank Fuel Pumps TEST/REPAIR MANUAL

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Carbureted Fuel System GENERAL INFORMATION On these vehicles, the engine management system is considered part of the emission control system. The major components include the carburetor(s), feedback control system, the air injection system, a throttle control system and the EGR system. The system consists of sensors and switches that feed information to the Electronic Control Unit (ECU), which will then operate several solenoid valves to maintain the ideal air/fuel ratio under all conditions. As useful as the tests found in this section are, the first step in repair or service to engine management systems is still to gain as much information as possible about the problem; when and under what conditions it occurs. At highway speed? At idle only? Only under heavy load or hard acceleration? Wet weather? Defining the problem will eliminate many systems from consideration and possibly point to the affected system. Before diving into an extended electrical diagnosis, take the time to review the basics. Check every vacuum line for cracks or leaks. Check every electrical connector for corrosion or loose pins. Quite often, simply unplugging and reconnecting a connector will break up corrosion on the pins and restore the circuit. Watch out for poor grounds, particularly if the car has experienced major bodywork. COMPONENT TESTING Air Injection System The purpose of this system is to supply oxygen to the exhaust stream at a point in the exhaust manifold that is hot enough to burn off some of the hydrocarbon emissions. The main component is an air suction valve. The valve is spring loaded to stay closed, with engine vacuum supplied to a diaphragm that reduces the spring pressure and allows the reeds to open. The ECU regulates the engine vacuum to the diaphragm by operating a solenoid valve. 1. With the engine at normal operating temperature and at idle, remove the air cleaner and listen for a bubbling sound at the air suction port. There should be no sound at idle, meaning the air suction valve is closed. 2. If the noise is heard at the air suction port, disconnect the vacuum hose at the air suction valve and connect a vacuum gauge to the hose. There should be no vacuum. If there is vacuum and the noise stops, the problem is in the control system. If there is no vacuum and the bubbling sound is still there, the air suction valve is defective and must be replaced. 3. To test the valve, draw a vacuum at the air suction valve diaphragm and listen for a bubbling sound at the air suction port. If no sound is heard, the air suction valve or diaphragm is faulty. Throttle Control System

2004-2007 Ford Explorer MIL ON WITH DTC P0463 OR ERRATIC FUEL GAUGE OPERATION SERVICE PROCEDURE

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ACTION Follow the Service Procedure steps to correct the condition. SERVICE PROCEDURE 1. For vehicles with customer symptom of erratic fuel gauge operation (with no MIL on), proceed to Step 1a. For vehicles with a customer symptom including the MIL on, proceed to Step 1b. If unable to verify the concern, do not continue with this TSB. a. Follow the appropriate pinpoint test (PPT) for “Fuel Gauge Inaccurate” in Workshop Manual (WSM), Section 413-01. If PPT test results lead to fuel pump module replacement, proceed to Step 2. If PPT test results isolate any problem other than fuel pump module replacement, repair as indicated and do not continue with this TSB. b. Install diagnostic scan tool to retrieve DTCs. If DTC P0463 is retrieved, proceed to Step 2. If DTC P0463 is not retrieved, this TSB does not apply, follow normal WSM diagnostics. 2. Remove fuel tank per WSM, Section 310-01 3. Remove fuel pump assembly from fuel tank per WSM, Section 310-01. See Figure 1 (Chart) to determine if a kit (contains a fuel level sensor assembly, a wire harness and heat shrink tube) or fuel pump assembly is required for repair. For vehicles that can be serviced with a kit go to Step 4. For vehicles that require fuel pump assembly replacement, go to Step 12. 4. Remove the fuel level sensor assembly (sender card/float rod assembly) from the fuel pump assembly per WSM, Section 310-01

2000 Toyota Celica GT-S L4-1762cc 1.8L FUEL PUMP ASSEMBLY Removal and Installation Instructions

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Protect the disconnected fuel tube from damage and foreign material by covering it with a plastic bag. a. Remove the 8 bolts and fuel tank vent tube set plate. b. Pull out the fuel pump assembly. NOTE: Do not damage the fuel pump filter. Be careful that the arm of the sender gauge should not bent. c. Remove the gasket from the pump assembly. a. Install the new gasket to the fuel pump assembly. b. Install the fuel pump assembly to the fuel tank . NOTE: Do not damage the fuel pump filter. Be careful that the arm of the sender gauge should not bent. c. Install the 8 bolts and fuel tank vent tube set plate from the fuel tank . Torque: 4.0 Nm (40 kg.cm, 35 in.lb) a. Clean up around the fuel tube. b. Connect the fuel tube and emission tube to the fuel pump assembly. c. Connect the tube joint clip to the fuel suction plate. HINT: Start the engine, check for fuel leakage