Trying to locate and replace the water pump on a 2000 Pontiac Sunfire.....

Are the fan/s coming on when reaching operating temperature ?

hello! I had the same problem with my 2000 Pontiac Sunfire... there might be one of these 2 problems with it.... maybe the Heater Core is jammed and the coolant dosen't flow thru the engine to cool it off, or the water pump is defective.... does the heating works or not? if yes, the water pump is defect, if not, the heater core is jammed, try a ''radiator hose cleaner'' (sold in Napa's or Carquest..) it will act as a kind of ''decloaker''.. if works, good! 15$ solution... if not, replace Heater Core... ~150$

GM doesn't use a fuel pump shut off switch, the safety system works like this, fuel pump is turned off if the engine oil pressure goes to zero with the key in the run position. Ford uses a shut off switch that is activated by an impact exceeding 3 G's (3X the force of gravity), it is called the fuel pump shut off inertia switch.

that could be a relay switch,look under the hood for a rectangled shape black box the relays should be located in that box

Probably either head gasket blown, or crack in head or block. Have you had the engine hot lately? Look for white smoke out of exhaust that will confirm head gasket or cracked block or head.

Unfortunately the water pump is located under the timing belt requiring the belt to be remove to do the water pump.

The fuel filter is in the hood (metalic black) and the fuel pump is in the fuel tank (either through the back seat or bringing the tank down.

Cheers

why my 2000 sunfire 2.4 burn lot of gas.

the pump turns off the timing chain its a major job wouldnt recomend trying at home

Follow your fan belt - it goes around the water pump pulley. Can be done at home with a little mechanical abilty and tools - not real fun - some of the bolts are a little hard to get to