72 Blazer K5 Fuel Gage Stuck On Empty.

[Artiep92]

Can the sending unit possibly be bad if it's brand new? Will check the ground again.

[TBONE1964]

Originally Posted by Artiep92

Can the sending unit possibly be bad if it's brand new? Will check the ground again.

Yes it is possible to get bad parts right out of the box brand new. It does happen but to me it sounds like you have connection issues.

How much gas to you think is in the tank now? It should read about 1/4 tank with 5 gallons. If you turn the ignition to the run position, reach up behind the cluster and wiggle the connector where it plugs in to the circuit board and watch the gauge to see if it moves around or not.

You also have 2 grounds to be concerned with. The sending unit needs to have a good ground to the frame. There is also ground on the gauge that comes from the connector that plugs into the circuit board. The ground wire is black and is located in pin number 7 of the connector (if you have a full gauge cluster) On the back of the gauge there are 3 studs. One one the left (looking at the front of the gauge) is power from ignition, the one one the right is from the sender (not the ground, should be a tan wire) and the middle lower one is ground. You can use the lower middle stud and try a temporary ground there and see what happens.


Keep use posted.
Tom

[red71cheyenne]

Had the same problem when I put my new sending unit in, turned out the fuse in the fuse block had blown and it only affected the gas guage. Check the fuse.