Question about 1998 Chevrolet Cavalier
The relay was replaced with a new one and still had the same problem and the alternator is putting out 14 volts and the pump was replaced and the wiring harness was inspected and is good and still it wont start and the relay is still buzzing??
If you are sure the fuel pump relay is working, check continuity from the pump to the relay socket. These wires love to corrode. When you turn your ignition on, the fuel pump will only run for a couple seconds before it shuts off via the automatic shutdown relay. Make sure you are checking power within this window. The PCM (powertrain control module) is what completes the ground in order for the relay to send power to the pump. If the PCM does not recieve a signal from several sensors (mainly the Crank Sensor) it will not turn on the pump. You may want to check these sensors, is the check engine light on? You can scan it to see if any sensors have thrown a code. Be sure all applicable fuses are ok, the PCM may have its own fuse, check that even if the fuel pump fuse is ok. Your Truck may also have an inertia switch for the fuel pump which shuts it off during an accident. Check that as well.
Posted on Mar 20, 2009
are you using the original key ?? sounds wear but in the key switch there is a sensor that detects if the right key is in use otherwise it will kill the power to the fuel pump or it can be a fuse look under the left rear passanger seat there is another set of fuses and the other set of fuses are on the driver side near the door and there is another set of fuses and relays inside the hook next to the battery
Posted on Apr 01, 2009
on the drivers side left rear frame next to bumper bracket there is a ground for the fuel pump make sure it is not cut or rusty . the 4.3 has a oil sending unit at back of intake it controls fuel pump . oil sensor tells the computer to give power to fuel pump.
Posted on Apr 15, 2009
SOURCE: 1996 f150 fuel pump
You may have a break in the wire inside the tank to the fuel pump. I have seen the wires disconnect as the pump is installed.
Posted on Jun 10, 2009
could be a bad earth or [ground]
the power wire ma be brocken or have a loose or dirty connection
you neeed to trace it along its lenght to determine the fault!
so start at the pump & work back
Posted on Jul 20, 2009
the computer is what sends the signal to the fuel pump relay. Check the harness plug at the fuel pump again they tend to get loose. there is an updated replacement plug for this. also make sure the terminals on the fuel pump relay are clean and not corroded.
Posted on Nov 02, 2009
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