Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
Have you tested for power and ground at the fuel pump when it will not turn on?
Let me know so we can continue,thanks Pete
Did you test for power at the pump on the gray wire with the key on the first 2 seconds the key is on and when cranking the engine?
Is there a second black wire in this connector and if so does it have ground as well?
I show this for info on this pump connector.
You should have both black wires as grounds.One is a ground feed for the fuel level sensor and one is a pump ground.The gray is the pump power feed and the purple is the feed to the instrument cluster/gauge assembly.
Is there any way you can take a picture of this and upload it here so I can see the connector?
Do you know if this is a late model year 1996 or 1997 model year,according to the registration?
O.k.,I would assume 1997 this late in 1996.Is there any way you can upload the pics on this?
There should be a paper clip icon that you can see to upload pics.Let me know if you see it.
O.k.,on my end there is a paper clip yours may be the + add files link.Have you tried it to see if you can upload them there at all?
Did you install this connector new into the harness?
O.k.,someone has wired it in.This is the new style connector you see with the 4 wires in it black,black,grey and purple.The purple is the gauge signal for fuel level,one black is ground for the pump,one black is ground for the gauge and the gray is power.Follow this short new harness on the connector to the main harness and remove the tape and see how well the connections were spliced in when this connector was installed.The new connector you have came with a short harness that is wired into your factory harness.If they crimped the connections poorly or messed up and shorted wires together this issue occurs.This is where I would start.Usually its about 4 to 6 inches away from the connector in the harness that they install this.Let me know if you find any issues.
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This is very possible as one is sensor ground and one is gauge ground.What color wires do these connect to in the harness?
That isnt right.You should have voltage on the gray wire for 2 seconds and when cranking.One black should be a ground for sure and is the pump ground.Then the gray wire is the power feed for 2 seconds and when cranking.Somewhere along the wiring harness the wires are shorted or cut into and spliced together incorrectly.
Here is how it is suppose to be wired and what each signal should be.
Let me know what you come up with here.
I suspect what has occurred here most likely is that the short may have caused damage to the instrument cluster itself.I dont suspect the sender unit as this is a resistance sender and a short shouldnt have damaged it.It sounds like either the short damaged the cluster or the cluster has failed on its own.
One other possibility is the PCM has become damaged.Let me know if the cluster corrects this here.
I apologize for the delay as I was out of town
It is very possible the PCM was damaged due to the shorted wiring causing the issue with the gauge and stall out here now.