Question about 1998 Chevrolet Cavalier

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Fuel pump relay is buzzing

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??

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  • John Jon May 11, 2010

    ignition problem! that relay is getting a continues circuit! sounds like you shorted something out or as other guy said GROUND!!!! better watch it you do not end up in smoke!

  • yadayada
    yadayada May 11, 2010

    the relay is buzzing due to a faulty ground connection.

  • gearhead_lif May 11, 2010

    the buzzing noise is the relay cutting on and off rapidly. the relay will burn up if it continues the buzzing

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6 Suggested Answers

  • 45 Answers

SOURCE: 2001 chevy silverado 2500 hd, 6.0, replaced fuel

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

flacooo1
  • 172 Answers

SOURCE: I have a 2002 chevy blazer 4.3L that wont start

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

  • 126 Answers

SOURCE: no power from wiring harness to fuel pump on 2000 s 10

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

  • 195 Answers

SOURCE: 1996 f150 fuel pump

Hello;
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.
Rich
RPM Northwest

Posted on Jun 10, 2009

  • 850 Answers

SOURCE: 2000 elantra no power to fuel pump.

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
Cheers rob

Posted on Jul 20, 2009

  • 98 Answers

SOURCE: 1993 lumina 3.1 engine. shuts down while

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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How to hot wire fuel pump for 97


How to
Hot Wire Your Fuel Pump With a Relay in the Trunk




Terry Littleton - tlnfm@peganet.com


You Will Need

Get 15 ft 10 gauge wire, 3 ft 14 gauge wire, and a Bosch 4 or 5
prong 30 amp relay. Any place that installs car alarms should have a Bosch
relay. Get a heavy 10/12 gauge wire 30 amp fuse holder. They can be found at
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Make sure it is heavy wire and not like most that use like 14/16 gauge wire. You
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gauge female spade connectors, 2-14 gauge female spade connectors, 1-10 gauge
and 1-14 gauge ring connector. Soldering gun, wire
protector.

Procedure



  1. Disconnect battery. Put a ring connector on one end of the 10
    gauge fuse wire and attach that to the post at the rear of the alternator. Run
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    ten gauge wire that you will run to the back of the car. I put mine inside the
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  2. Run it through the hole next to the powermaster where all the
    wires go through the firewall. I routed it over behind the emer brake pedal,
    down behind that kick panel, took off the sill plate and put it inside the
    plastic wire protector (it does come open, just a pain to figure it out). Take
    out back seat and run it from sill up to opening that goes into the trunk. There
    are other wires that do the same thing, just follow them. Bring wire down to the
    hinge support. There is already a hole right there to put a bolt and nut through
    to mount the relay. I had a radioshack relay but it broke so I got a
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  3. Just a word of caution. Follow the wires down to the side of the
    trunk floor. The copper colored wire is the one to attach the trigger wire to.
    It looks like bare copper wire but is actually coated. The coating is so hard, a
    regular scotch lock wouldn\'t make contack on mine, so I cut out a half inch
    section of the insulation and soldered the trigger wire (a small piece of 14
    gauge from the relay prong 86) to there. I wrapped it in tape and put corrugated
    wire guard over it.



  4. The ground wire from the relay (a small piece of 14 gauge from
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    clean off the paint first. Then hook up the 10 gauge wire from the alternator to
    post 30 on the relay. The remaining prong on a 4 prong relay is the "Power Out"
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  5. Run the remaining heavy gauge wire from the "Power Out" prong
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  6. The 3 wires going to the sender/pump are Black-Ground,
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    another piece of 10 gauge to it for power from where it splices into the
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  7. Now the wire coming through the firewall goes over behind the
    drivers valve cover and along the back edge of it under the EGR tubing in wire
    protector and splices into the other fuse wire from the
    alternator.



  8. When you turn on the ignition, you should hear the fuel pump
    prime. The only problem I had was in the connection of the trigger wire to that
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Hope this isn\'t confusing. I did it this way to keep things neat
in the engine compartment.

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