I just replaced fuel tank, sending unit and fuel pump. got everything back together, and engine turns over, but acts like it's not firing. i replaced the coil, but still nothing. now today i didn't hear the fuel pump come on when i turned the key on. this vehicle was running when i parked it to wait for money to fix the fuel problem, help!

Try banging on the fuel tank, and then quickly try to start it, if it starts your fuel pump is almost dead and will need replaced soon.
If it doesn't start, test for power at the wiring connector on top of the fuel tank. This test requires 2 people, because the fuel pump is only powered for a few seconds when the engine isn't running. If you have power, then the problem is in the fuel pump (completely failed or bad wiring connection on the pump/inside the sending unit)

your fuel system needs to be primed

Your problem is in the sending unit itself or the float arm. The fuel pump mounts in the sending unit lines.

can you hear the pump run?? if you can i would start by changing the fuel filter before i droped the tank... also did you check your relay for the fuel pump, under the hood?? the sending unit doesnt send the fuel to the engine, the sending unit is what operates your gauge... so, if your pump is junk and got to drop the tank, the sending unit is built in the pump, so kill 2 birds with one stone, and replace the fuel pump assembly, and everything will work.
hope this helps

from autozone.com:

The Fiero is equipped with a electric fuel pump and gauge sending unit mounted in the fuel tank. The pump is serviced and a complete unit by removing the fuel tank.
REMOVAL & INSTALLATION

CAUTION To reduce the risk of fire and personal injury, it is necessary to relieve the fuel system pressure before servicing any fuel system component. If this procedure is not performed, fuel may be sprayed out of the connection under pressure. Always keep a dry chemical (Class B) fire extinguisher near the work area.

1. Disconnect the negative (-) battery cable.
2. Relieve the fuel system pressure.

Remove the fuel pump fuse from the fuse block located in the passenger compartment. Start the engine and run until the engine stops due to the lack of fuel. Crank the engine for 3 seconds to ensure all pressure is relieved.

1. Drain all the fuel from the tank using a suction pump.
2. Raise the vehicle and support with jackstands.
3. Disconnect the wiring from the tank.
4. Remove the ground wire retaining screw from under the body.
5. Disconnect all hoses and filler neck from the tank.
6. Support the tank on a jack and remove the retaining strap nuts.
7. Lower the tank enough to disconnect the fuel sending unit wires.
8. Disconnect the fuel line, vapor line and return line.
9. Remove the tank from the vehicle.
10. Remove the fuel gauge/pump retaining ring by turning the cam lock ring counterclockwise using a spanner wrench such as tool J-24187.
11. Remove the gauge unit and the pump.

To install:

1. Inspect the fuel pump attaching hose for any signs of deterioration and replace if necessary. Also, check the rubber sound insulator at the bottom of the pump.
2. Push the fuel pump assembly into the attaching hose.
3. Using a new O-ring seal, install the pump assembly into the tank.
4. Install the cam lock ring over the pump and lock by turning clockwise with a spanner wrench J-24187 or equivalent.
5. Support the tank on a suitable jack.
6. Raise the tank enough to connect all fuel and filler hoses.
7. Connect all electrical wires to the pump and tank.
8. Raise the tank and install the retaining strap nuts. Use new sound reducing pad if they are damaged. Check all connections and wire to ensure proper installation before refilling the tank.
9. Refill the tank with unleaded fuel. Reconnect the negative (-) battery cable.
10. Start the engine and check for fuel leaks and gauge operation.

no, sorry. Here are the R&R instructions from autozone.com:

The following procedure requires the use of the GM Fuel Gauge Sending Unit Retaining Cam tool No. J-24187 or equivalent.


CAUTION Before removing any component of the fuel system, be sure to reduce the fuel pressure in the system. The pressure regulator contains an orifice in the fuel system; when the engine is turned Off, the pressure in the system will bleed down within a few minutes.

1. If the fuel system has been in use, turn the ignition switch to OFF and allow the system time to reduce the fuel pressure.
2. Disconnect the negative battery terminal from the battery.

Be sure to keep a Class B (dry chemical) fire extinguisher nearby.


CAUTION Due to the possibility of fire or explosion, never drain or store gasoline in an open container.

1. Using a hand pump or a siphon hose, drain the gasoline into an approved container.
2. Raise and support the vehicle on jackstands.
3. Support the fuel tank and remove the fuel tank-to-vehicle straps.
4. Lower the tank slightly, then remove the sender unit wires, the hoses and the ground strap.
5. Remove the fuel tank from the vehicle.
6. Using the GM Fuel Gauge Sending Unit Retaining Cam tool No. J-24187 (or equivalent) or a brass drift and a hammer, remove the cam locking ring (fuel sending unit) counterclockwise, then lift the sending unit from the fuel tank.
7. Remove the fuel pump from the fuel sending unit, by performing the following procedures:
   1. Pull the fuel pump up into the mounting tube, while pulling outward (away) from the bottom support.
   
   

When removing the fuel pump from the sending unit, be careful not to damage the rubber insulator and the strainer.

1. When the pump assembly is clear of the bottom support, pull it out of the rubber connector.

To install:

1. Inspect the fuel pump hose and bottom sound insulator for signs of deterioration, then replace it, if necessary.
2. Push the fuel pump onto the sending tube.
3. Using a new sending unit-to-fuel tank O-ring, install the sending unit into the fuel tank.

When installing the sending unit, be careful not to fold or twist the fuel strainer, for it will restrict the fuel flow.

1. Using the GM Fuel Gauge Sending Unit Retaining Cam tool No. J-24187 (or equivalent) or a brass drift and a hammer, turn the sending unit-to-fuel tank locking ring clockwise.
2. Install the fuel tank, align the insulator strips and install the strap bolts. Torque the inner fuel tank strap-to-vehicle bolts to 26 ft. lbs. (35 Nm) and the outer fuel tank strap-to-vehicle nuts/bolts to 26 ft. lbs. (35 Nm).
3. Connect the fuel lines.
4. Connect the negative battery cable, start the engine and check for leaks.
5. Lower the vehicle.

GM S10/S15/Sonoma Pick-Ups 1982-1993 Repair Manual Electric Fuel Pump - REMOVAL & INSTALLATION

1. Properly relieve the fuel system pressure.
2. Connect the negative battery cable.
   

Be sure to keep a Class B (dry chemical) fire extinguisher nearby.

CAUTION Due to the possibility of fire or explosion, never drain or store gasoline in an open container.

1. Drain the fuel tank, then remove it from the vehicle. refer to the procedure found later in this section for details.
2. Using the GM fuel gauge sending unit retaining cam tool No. J-24187, J-36608 (or equivalent) or a brass drift and a hammer, remove the cam locking ring (fuel sending unit) by twisting counterclockwise. With the locking ring released, carefully lift the sending unit from the fuel tank.
3. Remove the fuel pump from the fuel sending unit, by performing the following procedures:
   1. Pull the fuel pump up into the mounting tube, while pulling outward (away) from the bottom support.
      

When removing the fuel pump from the sending unit, be careful not to damage the rubber insulator and the strainer.

1. When the pump assembly is clear of the bottom support, pull it out of the rubber connector.
   

To install:

1. Inspect the fuel pump hose and bottom sound insulator for signs of deterioration, then replace, as necessary.
2. Push the fuel pump onto the sending tube.
3. Using a new sending unit-to-fuel tank O-ring, carefully lower the sending unit/fuel pump assembly into the fuel tank.
   

When installing the sending unit, be careful not to fold or twist the fuel strainer or it may restrict the fuel flow.

1. Secure the sending unit by turning or driving the lockring clockwise and into position under the tabs.
2. Install the fuel tank assembly to the vehicle.
3. Connect the negative battery cable and check for proper pump operation.

Good luck (remember rated this).

FUEL PUMP-REMOVAL:
1. Relieve the fuel pressure. (in order to relieve fuel pressure: 1. remove fuel cap. 2. remove fuel pump relay from the relay panal located under the center console. 3. start engine and wait for engine to stall, then turn off the ignition key. 4. Position a small screwdriver in the fuel pressure test port and carefully depress the valve to allow any excess fuel to bleed out of the fuel line.)
2. Remove the cable from the negative battery terminal.
3. Remove the fuel tank.
4. The fuel pump/fuel level sending unit assembly is located inside the fuel tank. Its held in place by a lock ring. Using a brass punch and hammer, carefully tap the lock ring couterclockwise and sperate the cover from the tank. ***WARNING*** Don not use a steel punch-a spark could cause an explosion.
5. Pull the fuel pump assembly out of the tank. Be careful when manipulating the module out of the fuel tank. it will be necesarry to angle it in various positions as you extract it.
6. Remove the O ring from the opening.
7. Inspect the filter on the lower end of the fuel pump. If its dirty, clean it with solvent and blow it out with compressed air. If its too dirty to be cleaned, replace it.
8. The Fuel pum cannot be disassembled except for removal of the fuel level sending unit. In the event of a defective fuel pump, replace the eniter assembly as a single unit or module.

Hope this Helps!

The sending unit sends a signal to the engine control module. The engine control module sends a serial message to the fuel gauge.
Check the connection at the fuel tank. If you have a digital multi-meter, check the resistance on the "purple" wire at the fuel tank connector, fuel tank side. The amount of resistance will be determined by the amount of fuel in the fuel tank. Generally it should be between 10 and 255 ohms.
Below is the wiring diagram for your car. Hope it helps, let me know.
Regards.

to be sure that it is the fuel pump so you won't have to remove it. you can install a pressure gauge at the outlet of the fuel filter which should be in the engine fire wall. just by turning on the key switch to on without turning on the engine there should be a pressure of 32psi or more if not it is the pump. the pump should be accessed in the fuel level sending unit access panel. directly on the bottom of the fuel tank above the sending panel. Remember only humans assembled your car surely humans can fix it. You just have to PRACTICE fire safety when opening the fuel tank. you will see a cylindrical piece much like a toy engine but longer with fuel strainer. remove and replace following the way you removed it. Money is hard to come by nowadays.