Where is the location of the fuel sending unit in an astro 1999?

Fuel sending unit has likely gone bad, inside tank

the sending unit is located inside the fuel tank beside the fuel pump. it operates like a rheostat, the float rises and the resistance in it increases and the float lowers and the resistance lowers as the fuel level changes.

If it is a 4.3 L engine, it is located at the right hand side of the distributer as you are looking in at the engine. It looks somewhat like a mushroom W/ a wire going iinto it.

You removed the relay and put back in, and it can start? It could be a relay going bad or a wiring terminal connection where the relay plugs in. I would try a new relay and see if problem goes away. Clean the terminals with an electronic cleaner spray, where the relay plugs in.

The fuel filter is located in the sending unit. This contains three primary components - the fuel pump, the fuel filter, and the fuel level sensor. The sending unit is located inside the fuel tank. This is done because the fuel around it helps cool the fuel pump, therefore extending its life. To remove the unit(You might need a lift), you need to:
1) Drain the fuel tank
2) Detach the fuel tank from the vehicle
3) Lower the tank
4) 'Unlock' the sending unit (it sort of locks in there, but there's no key or anything)
5) Remove the whole unit and replace the problem part.
6) Put the sending unit back.
7) Re-attach the tank.
8) Fill the tank.

Hi, typically, this would resemble a faulty sending unit, when the computer sets a code for this sensor, it will set your guage to empty as a result. A new sensor may correct this condition.Good luck...Coop

The fuel pump is located in the gas tank.

You will need to remove the sending unit at the top of the tank.

To access the sending unit, you will need to drop the tank by removing the straps. It is a big tank, so drain as much as possible, and don't forget to disconnect the battery before you start.

Hope this helps.

It is located in the gas tank, you will need to remove the sending unit at the top fo the tank. To access the sending unit, you will need to drop the tank by removing the straps. It is a big tank so drain as much as possible and disconnect the batter before you start.

Hope this helps

These fuel pumps go bad on this model all the time could be bad fuel pump once they run dry they are done.also this model was known for faulty fuel sending unit card that reads fuel level. Did you try adding fuel to the tank?

The fuel sending unit is part of the fuel pump .