Yes the fuel tank has to come out to change the fuel pump. But are you sure that is the problem ? Your vehicle has a Fuel Pump Flow Control Module (electronic's ) Or is it just your fuel level sensor you want to replace ? And to your question of
if the fuel level sensor is bad will the car shut down if the gage says it is emty but it is not?
No ,this will not shut down the vehicle. You probably have no idea of the complexity of the electronic's involved an the thing's that can cause the gauge not to work .
Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the ECM. The IPC receives a serial data message from the ECM indicating the fuel level percent. The fuel gage defaults to empty if:
• The ECM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of serial data communications with the BCM
• The BCM detects a loss of serial data communications with the ECM
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates in the IPC.
Unless you have a factory or professional type scan tool your better off taking your vehicle to a qualified repair shop.
Fuel Gage Inaccurate or Inoperative
Circuit/System Description
The fuel level sender changes resistance based on the fuel level. The engine control module (ECM) monitors the signal circuit of the fuel level sender to determine fuel level. When the fuel tank is full, the sender resistance is low and the ECM senses a low signal voltage. When the fuel tank is empty, the sender resistance is high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the fuel level sender in order to calculate the remaining fuel level percent in the tank. The ECM sends the fuel level message via the serial data circuit to the body control module (BCM). The BCM sends the fuel level percent to the instrument panel cluster (IPC) via the serial data circuit for display on the fuel gage.
Circuit
Short to Ground
High Resistance
Open
Short to Voltage
Signal Performance
Fuel Level Sensor Signal
P0462
1
P0463, P0464
P0463
P0461
Fuel Level Sensor Low Reference
--
1
P0463, P0464
P0463
P0461
1. Fuel Gage Inaccurate or Inoperative
Do you know what a DTC is ? diagnostic trouble code !
SOURCE: fuel pump
At the battery there is a tan or brown wire that if you touch it to the pos battery post should make the pump run. This bypasses the relay. Also, you can put a fuel pressure tester on the injector fuel rail - there is a connector that looks like an air pressure valve. Turn on the key and the pump should run. Pressure s/b typically arount 36 - 45 lbs. The motor will run with pressure down to about 28 - 30 lbs although maybe not very well. Below about 24 lbs it will simply not run at all. Sometimes when a pump goes it quits entirely, and sometimes it just gets tired but doesn't stop completely.
SOURCE: Fuel level sensor in tank bad????
Yes it is all one unit, and yes that is what the problem is. don't use aftermarket parts, use OEM, (Delco Remy) they are much better quality.
SOURCE: Gas gage doesn't work
It is possible the sender has failed, and can be replaced.
This sits in the fuel tank, so access has to be gained, usually be removing rear seats, access cover, and removing rivets and fixings.
It would be worthwhile to gain access to it and check first for any corrosion on electrical connectors. With a meter, you can check if it is working or not. If not - order a replacement before replacing it.
Please observe all safety precautions when working on fuel systems.
SOURCE: 2006 Chevy Trailblazer fuel level sensor
You have to drive your car up on metal ramps. Chock your wheel's, have your pressure relived, remove your negative battery terminal, have your fuel pumped out using drill powered pump or drive your vehicle to the reserve point. Loose your tank straps, and lower the tank. Unplug your electrical connectors and pull your tank out under vehicle so you can remove locking flange on top of the tank to remove fuel pump and sending unit out.Replace fuel level sending unit and reinstall it back.
For fuel related problem,
the help links are provided below.
Click the link below to go through its procedure: ----
How to relieve fuel pressure?
http://technoanswers.blogspot.com/2012/01/how-to-relieve-fuel-pressure.html
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Refueling problem?
http://repairhelpcenter.blogspot.com/2012/01/refueling-problem.html
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Car consuming more fuel?
http://repairhelpcenter.blogspot.com/2012/01/toyota-tercel-consuming-more-fuel.html
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How to maximize fuel economy on your vehicle?
http://schematicsdiagram.blogspot.com/2011/11/how-to-maximize-fuel-economy-on-your.html
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Fuel pump relay troubleshooting ?
http://repairhelpcenter.blogspot.com/2011/10/fuel-pump-relay-and-cooling-fan-relay.html
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How to Increase gas mileage vehicle?
http://schematicsdiagram.blogspot.com/2011/12/how-to-increase-gas-mileage-on-2011.html
---------
How to Test and Replace Fuel Injectors?
http://repairhelpcenter.blogspot.com/2011/11/how-to-test-and-replace-fuel-injectors.html
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How to replace Fuel Tank Assembly?
http://vwrepairhelp.blogspot.com/2011/11/how-to-replace-fuel-tank-assembly.html
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FUEL LINES AND FITTINGS ?
http://repairhelpcenter.blogspot.com/2011/11/fuel-lines-and-fittings-on-acura-car.html
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Replacing Fuel Charging Assembly on Car?
http://vwrepairhelp.blogspot.com/2011/11/replacing-fuel-charging-assembly-on-car.html
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How to replace Fuel Pressure Regulator ?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-fuel-pressure-regulator.html
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How to test Fuel Pressure and replace Fuel Pump?
http://repairhelpcenter.blogspot.com/2011/11/how-to-test-fuel-pressure-and-replace.html
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Car will not take fuel into the fuel tank?
http://repairhelpcenter.blogspot.com/2012/01/car-will-not-take-fuel-into-fuel-tank.html
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PGM-FI Main Relay location?
http://repairhelpcenter.blogspot.com/2011/11/pgm-fi-main-relay-on-acura-car-models.html
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How to Relieve Fuel System Pressure on Car Models?
http://repairhelpcenter.blogspot.com/2011/11/how-to-relieve-fuel-system-pressure-on.html
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How to Replace a Fuel Injector
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-injector.html
----------------
How to Replace a Fuel Pressure Regulator?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-pressure-regulator.html
-------------
How to Replace a Fuel Pump?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-pump.html
-------------------
HOW TO CLEAN A FUEL SYSTEM
http://schematicsdiagram.blogspot.com/2011/07/how-to-clean-fuel-system.html
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HOW TO REPLACE A FUEL TANK
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-fuel-tank.html
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HOW TO REPLACE A FUEL TANK CAP
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-fuel-tank-cap.html
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HOW TO REPLACE A FUEL PUMP ASSEMBLY
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-fuel-pump-assembly.html
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How to change fuel injector on gmc ?
http://schematicsdiagram.blogspot.in/2012/03/how-to-change-fuel-injector-on-2005-gmc.html
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Time to replace Fuel pump?
http://schematicsdiagram.blogspot.com/2011/12/time-to-replace-fuel-pump-on-1998-ford.html
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Emergency fuel shut switch location?
http://schematicsdiagram.blogspot.com/2011/12/emergency-fuel-shut-switch-on-ford-car.html
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How to jump fuel pump?
http://schematicsdiagram.blogspot.com/2011/12/how-to-jump-fuel-pump-on-chevrolet.html
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Car wont start when cold?
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
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Car wont start after sitting overnight?
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-after-sitting-overnight.html
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Car loses power while acceleration?
http://schematicsdiagram.blogspot.com/2011/12/car-loses-power-while-acceleration.html
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Fuel leaks from fuel pulsation dampener?
http://repairhelpcenter.blogspot.com/2012/01/fuel-leaks-from-fuel-pulsation-dampener.html
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Car will not allow to put fuel?
http://repairhelpcenter.blogspot.com/2012/01/car-will-not-allow-to-put-fuel.html
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Adding performance chip to increase Fuel mileage MPG?
http://technoanswers.blogspot.com/2012/01/adding-performance-chip-to-increase.html
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How to test Electric fuel pump?
http://technoanswers.blogspot.com/2012/01/how-to-test-electric-fuel-pump-on-gmc.html
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Fuel gauge drops to Empty?
http://technoanswers.blogspot.com/2012/01/fuel-gauge-drops-to-empty.html
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Fuel pump not working on Ford?
http://technoanswers.blogspot.in/2012/01/fuel-pump-not-working-on-1991-ford.html
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Fuel pump has no power on ford diesel?
http://technoanswers.blogspot.in/2012/01/fuel-pump-has-no-power-on-2002-ford-350.html
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Pushing on the gas pedal but the car slows down? Gas pedal to the floor and the
car slows down?
http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html
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Ford Fuel pump Relay and fuse location diagram?
http://technoanswers.blogspot.in/2012/02/ford-fuel-pump-relay-and-fuse-location.html
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Ford inside fuse box diagram showing fuel pump relay?
http://technoanswers.blogspot.in/2012/02/ford-inside-fuse-box-diagram-showing.html
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Ford fuel pump fuse layout diagram?
http://technoanswers.blogspot.in/2012/02/ford-fuel-pump-fuse-layout-diagram.html
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How to lower fuel pressure on Toyota?
http://schematicsdiagram.blogspot.in/2012/02/how-to-lower-fuel-pressure-on-toyota.html
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Fuel pump not running?
http://schematicsdiagram.blogspot.in/2012/02/fuel-pump-not-running.html
--------------
How to replace fuel filter on BMW?
http://schematicsdiagram.blogspot.in/2012/03/how-to-replace-fuel-filter-on-bmw-525i.html
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This will help.
Thanks.
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