Question about 1996 Chevrolet Cavalier

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Fuel pump wont run 96 cavalier only show 4.9 volts on grey wire on connector for pump where do i start

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Try changeing wireing harnes and cheak fuel pump relay and fuesse

Posted on Nov 17, 2009

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94 s10 fuel pump relay clicking no start


The clicking noise at the relay indicates that the relay is bad, or that the wires to the relay and/or connector is bad.

A relay is an electronically activated switch. Inside is a coil. When 12v+ is applied to one end of the coil, and a ground is applied to the other end, the coil gets charged, creating a magnetic field. This magnetic field literally moves a metal lever from position A to position B. One end of the lever is attached to constant battery power. When coil not energized, the lever rests in postion A (which in the case of the fuel pump relay is feeding the battery power to an unused terminal). When the coil is activated, the lever moves to position B (which in this case is a terminal connected to your fuel pump wire). Thus, when the relay is activated, 12v+ is being directed from the battery to the fuel pump.

This fast clicking indicates that the relay coil is not getting a constant voltage or ground supplied to it, thus the lever is moving back and forth between position A and position B, either there is a wiring issue, a connector issue, or an internal issue with the relay.
The relay has 4 wires, black, grey, orange, green with white stripe.
black = ground
orange = battery = 12v+ always
grey = wire out to fuel pump (on some cars this wire is tan with white stripe)
green/white = signal wire from ECM

When key is turned ON, the ECM sends 12v+ out on the green/white wire to the relay for about 2 seconds - this activates the relay coil for 2 seconds, thus running the pump for 2 seconds (priming). When the vehicle is started, the ECM sees a constant ignition signal from the ignition module, and sends a constant 12v+ out on the green/white wire, thus activating the relay coil constantly, and thus running the pump constantly.
When car shut off, no more constant ignition signal, thus ECM stops sending the 12v+ out on the green/white wire.
So, you can kind of test your connector ...
1) remove connector from relay
2) jumper a wire from the slot for the orange wire to the slot for the grey wire - fuel pump should run - wiggle wires to verify at connector
3) probe black wire slot with ohm meter - make sure black wire has constant ground - wiggle wires at connector
test relay ...
1) remove relay from connector
2) rig a ground wire to the tab that had the black wire when in connector
3) apply 12v+ to the tab that had the green/white wire - relay should click once and do this every time you apply the 12v+

That should help you track it down to either a connector problem, a wiring problem, or a relay problem.

Nov 28, 2015 | Cars & Trucks

1 Answer

I have a 97 gmc sierra 5.0 it wont start it has less than 12 volts of power on pump wire


What do you have coming out of the fuel pump relay ? The connector at the tank includes the ground wire for the gauge which is about 7 volts. Make sure you are checking the right wire.

Aug 24, 2014 | Cars & Trucks

1 Answer

96 Lumina 3.1 won't start. It runs when I spray starting fluid in the throttle body. It has 42psi fuel pressure at the fuel rail. Is it bad injectors?


It is not bad injectors, it is lack of injector electrical pulse, never would all the injectors fail at once. See if you have 12 volts (use a 12 volt probing test light, avail at any auto parts store for less than $5) to one wire of the two wire connector of each injector with the ignition key in run position. If the test shows no hot wire at the injector connectors then check fuses marked ECM1 and ECM2 in the under-hood fuse block. If they are popped then you have a shorted harness or component.

Jun 27, 2012 | 1993 Chevrolet Lumina

1 Answer

The new connector for the fuel pump 99 Chevy


One wire will be a common ground.  Depending on how much fuel you have in the tank you should receive a voltage from about 5 to 9 volts from the common ground to the fuel gauge - the other is the live to the Fuel Pump, typically - your 4 wire situation may be two grounds - one to each - put a fuse 10amp fuse in-line or disconnect the pigtail from tank and test for voltages and Zero resistance which would be the same as if you put both probes from your tester together and the meter shows "1" - if there is a problem or resistance then the reading will be "0" or the resistance value.  Be sure to use low Ohms setting or you may not get any reading.
This is of course - general info, from which should lead you to the answer you seek.
Good luck.
East Coast Canada Rocks!!!
:)

Good luck.
There may be a ground that just connects to the tank itself - you can test for Ohms with a meter to determine if these are ground wires or must be determined.  Can check between negative to battery to 

Jun 11, 2010 | 1999 Chevrolet Suburban

1 Answer

I have put 3 new fuel pumps in my 2002 cavalier and they all went bad with in about 4 months and i have put another new fuel pump in and now it wont start to pump fuel and i have power to the fuel pump....


Look at the connector in the left lower part of the dash. Like where your left foot would be while you are driving. You may need to move the carpet back a little and it's up off of the floor. there is large connector there I'm gonna say 16 or more pin connector. The fuel pump supply wire is in there, it is grey in color. Lots of times this wire is burn up in that connector. so the pump will work, but once it over heats the termanials it will die. Report back if that wiring is ok.

Nov 23, 2009 | 2002 Chevrolet Cavalier Coupe

1 Answer

What wire is the power for the fuel pump at the pump


there were some production changes in 1998 to the fuel pump wiring, so the connector can have 2 diff fuel pump power wire colors, the most common color is grey, but the the harness at the tank has just 4 wires, the larger wires at the four wire oval connector are the fuel pump 12 Volt and the other is the ground, it is black, the other 2 wires are the sending unit, also the connectors ( Chevy factory service bulletin) on this year had a problem with burning, so if you get a new fuel pump always replace the 4 wire fuel pump connector. I have attreached a picture of the connector
2ea264c.jpg

Jun 30, 2009 | 1998 Chevrolet C1500

3 Answers

1999 oldsmobile silhouette van won't start. no power to fuel pump


I have a silhouette and it had the same problem
Follow the fuel pump wiring harness to where it plugs into the floor of the van--pull the connectors apart--they will probably be corroded, and you will possibly have to change both wiring harnesses or connectors.

May 25, 2009 | 1999 Oldsmobile Silhouette

1 Answer

96 cavalier pass headlight out 10.4 volts to socket but wont ligh


are you trying a 9004 or 9007 bulb? very similar but actually differnt. Check and make sure you have a ground present at connector, these cars very bad for broken wires in harness under battery tray by washer fluid bottle

Dec 03, 2008 | 1997 Chevrolet Cavalier

2 Answers

1996 silverado 5.7 vortec cranks but wont start. fuel pump, gauges, "idiot" lights, blinkers do not work. flashers and all the rest of lights operate. Just replaced coil and this happens


Had the same problem with my '96 Silverado with 350 Vortec. The truck would only crank. It would start if fuel was poured down the throttle body. Could not hear the fuel pump hum. Fuse was good, but could not hear relay click. Relay was good, Did some electrical wiring trouble shooting. Turned out that one of the connectors that clasp onto one of the pins of the fuel pump relay wasn't making a good connection, too loose. I just stuck a peice of wire into the connector and pushed the relay back in. Relay clicked, Truck Started. It's been more than 4 yrs. since I made that McGuyver fix. Still firing.

Jul 26, 2008 | Chevrolet Silverado 1500 Cars & Trucks

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