Fuel Sending Unit Help!

[71' Swinger]

Hey guys...I have a 71' Dart Swinger. When I bought it the fuel gauge in the dash did not register, about two days after the purchase I filled the tanked hopped in and starter her up and the gauge registered all the way to full. Seeing this I realized or assumed there was nothing wrong with the gauge, it was most likely that the sending unit had issues. So I pitched a new one online and hooked it up before putting it in the tank and it worked, so I went ahead and installed it into the tank and strapped the tank back in; now the damn gauge isn't working again! I'm think maybe a bad ground? Any suggestions would be much appreciated. Anyone know how to test it without dropping the tank again?

Thanx

 

[mopar340dave]

The guage should max out when you ground the wire. If it does it's good.

The sending unit/float assembly does need to be grounded. This link shows a very simple and cheap way to accomplish that.
http://www.moparfins.com/Repairs/Fuel_Gauge_Repair/Fuel_Gauge_Repair.htm

 

[71' Swinger]

Thanx dave, much appreciated.

 

[mopar340dave]

no problem

 

[mullinax95]

Make sure the tank is grounded to the frame also. My new tank and sending unit would not work unless I grounded the tank to the frame with a homemade ground strap.

 

[RedFish]

There should be a ground jumper over the short rubber fuel line that completed the ground path from sender to chassis. Without it the sender is isolated by that hose and the rubber seal.