P0461 Trouble code on 2004 Mits Diamante

Check and or test fuel gauge sending unit and the gauge . Videos on youtube showing how to . Also i would have the vehicle checked for DTC's - diagnostic trouble codes . You may want to think about taking to a qualified repair shop .

Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the BCM 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.

DTC P0461
The fuel level sender changes resistance based on fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sender resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percent in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics.

DTC P0462 Fuel Level Sensor Circuit Low Voltage
DTC P0463 Fuel Level Sensor Circuit High Voltage

There is no fuel cut switch on the diamant? the fuel pump relay is controlled by the ECM ground circuit to the fuel pump relay or the efi relays. If you need to turn the pump of find the fuel pump fuse and pull it out.

P0461 Cadillac Fuel Level Sensor Circuit Range Performance

Could loose ground rusty fuel tank,

if you have a scanner that reads data go to your data and find out what kind of fuel pressure you have.it should read between 50 and 60 psi. .if you don't have a fuel pressure gauge just push on the Schrader valve and see if you have any fuel pressure after cranking for a while. If you don't have any pressure it's probably the fuel pump.

You need a specific adapter to scan your trouble codes. Vehicles prior to 1996 use OBD1 scanners, which are very expensive. Your best bet is to call around a few shops in your area and ask what they would charge to diagnose the code. It sounds like you may have more than 1 problem. The emissions could be due to a bad oxygen sensor and acceleration problem may be due to bad plugs, plug wires, clogged fuel filter, rotor and distributor cap, etc. Do a tune up on it, then see where you stand. At least you won't have to pay a shop to do it if that fixes your acceleration problem.

P0461....Fuel Level Sensor Circuit Range/Performance ,

FUEL GAUGE UNIT FAULTY LOCATED ON TOP FUEL TANK.REMOVE FUEL GAUGE UNIT COVER IN THE REAR FLOOR PAN.

My expertise is with Mits Galants but most of that carries over to the Diamante. The front half shaft axles on the mits galant has a circle clip on the end that slides ionto the trans. I assume the Diamante have the same circle clip. Thes are suppose to be replaced each time you pull the axle but usually you don't have to unless they are bent or out of round. These circle clips are suppose to compress when you shove the axle in and then expand once the axle is in. Look at your axles and if the clips are messed up replace them (the clips not the axle). Ideally the axle just slides in with a good solid shove as long as you have the splines on the axle end aligned. There should be a minor catch from the circle clip as it is being compressed.