Fuel pump recently change fuel pump but now when quarter fuel in tank the petrol light goes on as if need to fill tank but as i said got quarter in tank, never did it before i changed pump.please anyone can tell me why.

SOURCE: changing a petrol tank sender unit

Search for a manual in the web here, im sure that you'll find one.

SOURCE: how to change a fuel pump in a 2000 chevy blazer

Good Day,

I am assuming that you have the 4.3L V6.

The fuel pump is always a pain on trucks becasue you have to remove the tank to gain access. The pump is bolted in on the top side of the tank. I hope it doesn't have a full tank of gas as it needs to be drained(re-use when job is complete). Not to mention pulling a tank that's full of gas very heavy.
See this link for an overview:

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800a13e9

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800a145a

Here's how you test the fuel pump relay, and fuel pump:

1. Turn the ignition OFF.
2. Remove the relay.
3. Locate the two terminals on the relay, which are connected to the coil windings. Check the relay coil for continuity. Connect the common meter lead to terminal 85 and positive meter lead to terminal 86. There should be continuity. If not, replace the relay.

1. Turn the ignition key OFF for ten seconds.
2. Turn the ignition key to the ON position but do not start the engine.
3. You should here the fuel pump operate for two seconds (a light electrical humming sound).
4. Apply a 12 volt fused jumper wire to the fuel pump prime (test) connector. This should be located in the driver's side of the engine compartment. The fuel pump should operate.
5. If the fuel pump does operate, remove and test the relay. If the relay is defective, replace the relay and repeat the test.
6. If the relay is operating properly, connect a grounded test light to the fuel pump relay control wire (green with white stripe) at the relay. Turn the ignition switch to the ON position. The test light should illuminate for two seconds and go out. If the test light does not illuminate, check the relay control wire for continuity and repair as necessary, then repeat the test.
7. Connect a grounded test light to the feed wire (orange) at the relay and turn the ignition key ON. The test light should illuminate. If the light does not illuminate, test feed wire for continuity and the fuse in the underhood fuse relay center. Repair as necessary and repeat the test.
8. If the fuel pump is still not functioning, connect a fused jumper wire between the feed (orange) wire and the fuel pump motor (gray) wire at the relay. The pump should operate.
9. If the pump does not operate, check the fuel pump motor wire for continuity and repair as necessary.
10. If the pump will still not operate, replace the pump.
11. If the pump does operate, start the vehicle and remove the relay. The vehicle should continue to run. If the vehicle stalls, check the fuel pump/oil pressure switch and its wiring. Repair as necessary and repeat the test.

1. Disconnect the negative battery cable.
2. Loosen the fuel filler cap to relieve fuel tank pressure.
3. Connect fuel pressure gauge J-34730-1A or its equivalent to the pressure connection. Wrap a shop towel around the fitting while connecting the gauge to prevent spillage.
4. Install the bleed hose into an approved container and open the valve to bleed the system. The system is now safe for servicing.
5. Drain any fuel remaining in the gauge into an approved container.

SOURCE: fuel gauge doesnt work

The fuel gauge in the fuel tank is simply a float connected to a bar connected to the sensor. Take a look at that and see if that float is stuck in one place causing a false reading.

SOURCE: ford fiesta,1996,petrol,fails to start.

either your fuel pump relay or the safety shut off switch

SOURCE: Two fuel pumps???

The 88 Cabrio has 2 fuel pumps and 2 fuel filters as well. One filter next to the main fuel pump and another under the hood next to the air filter. The transfer pump in the tank is easily acsessed under the back seat by an access panel with 3 screws. The Transfer pump has a screen which is notoriously clogged. The Main pump is on the frame on the passenger side mounted in a rubber casing. Both pumps can be tested by wiring the terminals straight to a battery. Check your relay and fuse first. The fuse is the 5th from the left and the relay is the 2nd from the left in the first row.