Question about 2000 Pontiac Grand Am GT

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2000 grand am 3.4 fuel pump wires

Try to force fuel pump on. I know gray wire is power but need to know what are the other wires are in order to turn pump on.. Pump / relay and theft sytem are good still ,just a power problem. Got the haynes book for the electrial diagram but doen't show what are the other wires are... Can you help me with this problem

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  • selfmade29 May 13, 2009

    There are like 8 wires, so all the other wires are for the sending unit? I forced power to the gray wire but nothing, I change the fuel pump last year. I don't know if there is a signal wire that needs to be applyed in oder to turn the pump on?

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IF U HAVE POWER ON GRAY WIRE AND GROUND ON THE BLACK WIRE THEN THE PUMP IS BAD.THE OTHER WIRES ARE FOR THE FUEL GAUGE SENDER

Posted on May 13, 2009

  • ITSCENTER May 14, 2009

    IT SOUNDS LIKE U ARE IN A HARNEES AWAY FROM THE PUMP.IF U CAN GET CLOSE THAT IS GREAT.THE GEAY WIRE IS POWER TO THE PUMP.THE BLAKE WIRE IS GROUND.SOUNDS LIKE A BAD FUEL PUMP

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Have fuel pump hooked up to gray and black wire but no power. It's a brand new fuel pump. Any suggestions? 1999 Pontiac Grand AM


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OK I HAVE REPLACED MY FUEL PUMP IN MY 2003 PONTIAC GRAND AM SE, THE FUEL SENDING UINT IS WORKING BUT THE PUMP IS NOT WORKING ,I HAVE CHECKED THE FUEL RAIL AND HAVE NO PRESSURE AND I HAVE ALREADY CHANGED...


O.K. this is going to be long but stick with me.
The gray wire that goes to the plug at the sending unit is the one to run the pump. We need to get power to this wire. This wire runs to the fuel pump relay. The relay has 4 pins one is the gray wire-one is the 15 amp power for the pump that has battery voltage with the key in the run and start position. one is ground and one is the relay trigger from the ecm. Pull the relay and look real close on the bottom side of it by the pins there will be numbers 30,85,86,87. 85 and 86 control the relay 30 is the power from the fuse and 87 is the gray wire going to your fuel pump. If you use a test light and see if it lights up between pin 85 and 86 when you first turn on the key (should come on for 5 seconds or so). If not we have a problem on the computer side. If so go to #2 below. If not ground test light and try 85 then 86 if it lights up on one of them when you first turn on key the other post (of 85 or 86) has a bad ground.
#2 So we now know the relay circuit is good Turn key on and check for voltage between post 30 and ground. if there is voltage then run a jumper wire from battery voltage through a 15 amp fuse to post 87 if the pump comes on its the relay if it stays off then there is a open in the circuit from the relay to the pump. don't forget to check for a good connection where the wires go into the plastic on the top of the sending unit. reply if I typed to fast and I can walk you through any step you have problems with.
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1 Answer

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