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Chevy Fuel Level Sensor

Chevy Fuel Level Sensor

So your car's CEL (Check Engine Light) is on and you had the codes scanned at a local parts store. Your car has either a P0171, P0174 lean fault code or both stored in the computer, these codes are based on Oxygen Sensor (O-2) readings. A lean code or codes indicate that there's too much oxygen in the exhaust. Remember parts stores have employees that have good intentions but they may not have the experience necessary to interpret what the trouble codes really mean. These codes are based on oxygen measurements in the exhaust. A common mistake with lean codes is to replace the oxygen sensors. This could be a very expensive mistake that will not fix the problem. Especially if both codes are present, because the chance of both O-2 sensors failing at the same time is very unlikely.

Most likely the cause is a vacuum leak. A vacuum leak can be caused from a vacuum hose, intake gasket or maybe even a leak in the air intake hose from the MAF (Mass Air Flow Sensor). Listen for a hissing sound that may lead you to the source of the problem. Some technicians will use a propane bottle with a hose attachment to help pinpoint vacuum leaks. With today's computers it's not quite as easy to check for vacuum leaks this way because the ECU (Electronic Control Unit) will compensate quickly for the added fuel and a change in idle is harder to notice. Oxygen sensor readings can be monitored with a scan tool while checking for leaks with propane, by looking for increased readings when enriching the mixture. Another way technicians can check for vacuum leaks is with a smoke test. By introducing smoke into a vacuum hose on the engine, the leak will be revealed when the smoke escapes from the problem area.

Aftermarket air filters that use oil on the element can sometimes damage the MAF. Over oiling the air filter may allow some excess to get on the MAF sensor wire or element. This can alter the reading, fooling the ECU into seeing more or less air flow therefore changing the air/fuel mixture incorrectly. I once worked on a car that would not start that had a problem with a MAF. When looking at the wire in the MAF, there was a burned piece of trash that made it's way past the air filter. After cleaning the sensor the car ran perfectly. The ash that was on the MAF sensor wire was altering the reading by enriching the mixture so much that the car could not run. After talking with the customer, he said the air filter was just changed. This was obviously when some trash got into the air intake hose that settled on the hot wire of the MAF.

Fuel Pressure could also cause a lean condition. If the fuel filter is clogged or the fuel pump pressure is low, there could be higher level of oxygen in the exhaust also. Most of the time though, the ECU will compensate for the reduced fuel volume. So this is one of the least likely causes of a lean code.    

About the Author. Hi I'm Dennis Bandy, thanks for reading. I've been an ASE Master Auto Technician for over 20 years and have also sold professional auto tools since 2005. I am in a unique position to help readers with automotive repair related topics since I've had personal hands on experience with many auto repairs and automotive specialty tools. This is not a hobby for me, this is my business. Your feedback is really appreciated, if you thought this article was helpful or informative, please rate it below (thank you in advance).
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Lowrance 120-41 EP-65R Fuel Level Sensor $99.95 "Lowrance EP-65R Fuel Level Sensor, Product # 120-41 The Lowrance 120-41 is a EP-65R Fuel Level Sensor for use with the Lowrance marine equipments. It connects to a conventional fluid level sender in any type of tank, and converts the data into NMEA 2000 information. It includes a 10' cable and works with NMEA 2000 Compliant Units. 120-41 Features: Fuel Level Sensor, 10' Cable Length, Connects to Existing Fluid Level Arm, Resistance Values Of 33 To 240 Ohms, Fluids Measured w/ Any Fluid Container, Includes N2K-T-RD, Compatible With: NMEA 2000 Compliant Units"

Cruiser; Fuel Level Gauge $73.99 Cruiser; Fuel Level Gauge; 2-1/16 in.; 0 Ohms Empty; 90 Ohms Full; For Most Chevy/GM 1965-97;

Cobalt Electric Fuel Level Gauge $75.99 Cobalt; Electric Fuel Level Gauge; 2-5/8 in.; 0 Ohms Empty; 90 Ohms Full; For Most GM/Chevy Senders;

Phantom II Electric Fuel Level Gauge $75.99 Phantom II; Electric Fuel Level Gauge; 2-5/8 in.; 0 Ohms Empty; 90 Ohms Full; For Most GM/Chevy Senders;

Ultra-Lite II Electric Fuel Level Gauge $75.99 Ultra-Lite II; Electric Fuel Level Gauge; 2-5/8 in.; 0 Ohms Empty; 90 Ohms Full; For Most GM/Chevy Senders;

Garmin GFS And 153; 10 Fuel Sensor $199.99 GFS and 153; 10 Fuel Sensor Add fuel tracking capabilities to your Garmin chartplotter and optimize your boats fuel economy. The GFS 10 tracks fuel flow use and sends the data to your chartplotter via the Garmin CANet or NMEA 2000. Unlike other fuel flow sensors, the GFS 10 will include fuel level sensing capability when connected to an existing analog fuel gauge or resistive fuel tank sensor. Maximum fuel flow rate for the GFS 10 is 50 gallons per hour, and the minimum flow rate is two gallons per hour.

Garmin GFS 10 Fuel Sensor (010-00671-00) $199.99 "Garmin GFS 10 Brand New Includes One Year Warranty, The Garmin GFS 10 gasoline fuel sensor will add fuel tracking capabilities to your Garmin chartplotter and optimize your boat's fuel economy. The GFS 10 tracks fuel flow use and sends the data to your chartplotter via the Garmin CANet or NMEA 2000 . The GFS 10 will include fuel level sensing capability when connected to an existing analog fuel gauge or resistive fuel tank sensor. Maximum fuel flow rate for the GFS 10 is 50 gallons per hour, and the minimum flow rate is two gallons per hour. The GFS 10 is fire resistant and complies with U.S. Coast Guard standards. GFS 10 Features: Gasoline Fuel Sensor, Part Number: 010-00671-00, Tracks Fuel Flow Use & Sends Data to Chartplotter via Garmin CANet or NMEA 2000, Fuel Level Sensing Capability, 3/8"" Barbed Fittings, 50 GPH Maximum Flow Rate, 2 GPH Minimum Flow Rate, 0.5 PSI at 20 GPH/1.0 PSI at 40 GPH Maximum Back Pressure, 10-22 V Supply voltage, Complies w/ U.S. Coast Guard Fire Resistant Standards, Included FREE: Mounting Hardware, Fuel Filter, 4 Reusable Stainless Steel Hose Clamps, NMEA 2000 to CANet&#153 Adapter Cable, NMEA 2000 T Connector & Terminators"

MSD Fuel Level Gauge $171.99 2-5/8 in.; Fuel Level; Programmable;

Fuel Level Sending Unit $19.83 Fuel Level Sending Unit

Garmin GFS 10 Gasoline Fuel Sensor $149.99 Add fuel tracking capabilities to your Garmin chartplotter and optimize your boat's fuel economy. The Garmin GFS 10 tracks fuel flow use and sends the data to your chartplotter via the Garmin CANet or NMEA 2000. Unlike other fuel flow sensors, the GFS 10 will include fuel level sensing capability wh

Garmin 0100067100 Boat Chartplotters GFS 10 Fuel Sensor $259.99 GFSamp;#153; 10 Fuel SensorAdd fuel tracking capabilities to your Garmin chartplotter and optimize your boats fuel economy. The GFS 10 tracks fuel flow use and sends the data to your chartplotter via the Garmin CANet or NMEA 2000.Unlike other fuel flow sensors the GFS 10 will include fuel level sensing capability when connected to an existing analog fuel gauge or resistive fuel tank sensor. Maximum fuel flow rate for the GFS 10 is 50 gallons per hour and the minimum flow rate is two gallons per hour. Product : GARMIN GFS 10 FUEL SENSOR NMEA 2000 OR CANET Manufacturer : GARMIN PARTS Manufacturer Part No : 0100067100 UPC : 753759076337

Stud Sensor & Laser Level $70.99 STANLEY 77-500 INTELLILASER™ PRO STUD SENSOR & LASER LEVEL

Air/Fuel Sensor Bung $31.99 Bazzaz Performance Air/Fuel Sensor Bung A necessity for the Bazzaz Z-AFM unit if your exhaust is not already equipped with one. Available in Stainless Steel or Titanium Welds-on to exhaust pipe

Nexus Fuel Level Gauge $139.99 Nexus; Fuel Level Gauge; 2-1/16 in.; 0 Ohms Empty; 0 Ohms Full;

Lowrance EP-65R Fluid Level Electronic Probe $79.95 LOWRANCE EP-65R FUEL LEVEL PROBE WITH CABLELowranceNET fluid level sensor electronic probe with 10 ft. cable. Includes N2K-T-RD (119-79).

Autogage Fuel Level Gauge $36.99 Autogage. Fuel Level Gauge. 2-5/8 in. 73 Ohms Empty. 8-12 Ohms Full. For Most Ford 1989-Earlier. Chrysler. Exc. 1987-Later Mustangs.

Stanley / STUD SENSOR & LASER LEVEL / 77-500 $91.62 Stanley - STUD SENSOR & LASER LEVEL - 77-500

Elite Series Programmable Fuel Level Gauge $155.99 Elite Series; Programmable Fuel Level Gauge; 2-1/16 in.;

Fuel Level Sender $18.84 Fuel Level Sender Unit for 150cc and 125cc 4-stroke QMJ152/157 QMI152/157 GY6 engine based scooters and vehicles. 3 pin connector Wire Length: 18 inches

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Fuel Level Float Datcon Instrument Fuel Level Float 100438P $56.01 datcon fuel level float includes necessary hardware and instructions 6 in. to 24 in. deep gas tank ranges from 240 to 33.5 ohms can be adjusted to swing either direction works with existing original fuel level gauge easy bolt-on-installation auto parts warehouse has extensive datcon instrument fuel level float catalogs.we are now offering free shipping on all datcon instrument fuel level float orders over $50.00. our secure datcon instrument fuel level float catalog is available every hour of everyday. shop with confidence for all your datcon instrument fuel level float needs. datcon instrument fuel level float are in stock and available today. save upto 60% off dealer price on your next datcon instrument fuel level float purchase. our online catalog contains a wide selection of the oem and aftermarket parts you need at unbeatable prices

Fuel Level Float Datcon Instrument Fuel Level Float 100437 $57.28 DATCON FUEL LEVEL FLOAT -- Includes necessary hardware and instructions; 6 in. to 24 in. deep gas tank; Ranges from 76 to 10 ohms; Can be Adjusted to swing either direction; Works with existing original fuel level gauge; Easy bolt-on-installation.. Auto Parts Warehouse has extensive Datcon Instrument Fuel Level Float catalogs.We are now offering FREE shipping on all Datcon Instrument Fuel Level Float orders over $50.00. Our secure datcon instrument fuel level float catalog is available every hour of everyday. Shop with confidence for all your datcon instrument fuel level float needs. Datcon Instrument Fuel Level Float are In Stock and available today. Save up to 60% off dealer price on your next Datcon Instrument Fuel Level Float purchase. Our online catalog contains a wide selection of the OEM and aftermarket parts you need at unbeatable prices

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