Is it hard to replace the oil sending unit on a 99 pontiac sunfir

Sending unit and the wiring from it needs testing.

It's probably the float on the fuel pump.pull the pump and clean or just replace the fuel pump and float.

you shoulb be able to..most bucket seats can be unbolted with the right tool..once removed you can see underneath which spring is broken and replace it..

well ebay is great for replacement owners manuals, for those issues however you are also going to need a repair manual which you can also find cheap on ebay.

it is the oil pressure sending unit. generally screwed into the engine block. autozone has a website with a parts locator feature. if the sending unit is good and the level correct then you have a bad pump.
usually if the oil pump is gone so is the whole engine.

yes... and if you dont want to spend money.. then let it be... the unit is weak but if you cont ck the oil etc.. you will be okay...

yes and any part store will get you the socket that you need to r&r .

Check the pressure in the low side A/C line. My guess is the refrigerant is low and needs recharging.

Under hood, driver side, front engine area, below cylinder head, where engine meets transaxle housing mounted in block

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It sound like the fuel sending unit in the tank is bad....There are only three things that can cause that. 1. The fuel sending unit is bad.....2. The instrument cluster is bad( highly doubtful)....3. A wiring problem( even less likely unless someone has been drilling holes in the floorboard or splicing wires together.

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you do what you whant but those caliper are cheap its not worth it puhing air in caliper to remove piston removing all seal and the worst cleaning it puting new seal check the price of rebuilt hope it FIXYA our problem thanks pierre