Gas gauge and sending unit replaced, still no accurate fuel level

[VTM880]

My original gas gauge and sending unit did not accurately reflect the actual fuel level in the tank so when I had the tank out for plastic welding I replaced the sender with a new one. Put it back together with the new sender and the gas gauge barely reads 1/4 tank when it was at least 1/2 full. Just put in an NOS gas gauge but it still does not indicate the proper fuel level. Anyone have any ideas as to what the problem is?

 

[Bob H]

99% of all electrical issues on these are ground related.
That being said, I have 3 of these ole Dodges in use and none of the gas gauges are accurate, each one reads different too. The M880 "E" is a 1/2 tank, M884 "3/4" is empty! The Ambulance "3/4" is full.
Forgetting which read what can be an issue!

 

[VTM880]

99% of all electrical issues on these are ground related.
That being said, I have 3 of these ole Dodges in use and none of the gas gauges are accurate, each one reads different too. The M880 "E" is a 1/2 tank, M884 "3/4" is empty! The Ambulance "3/4" is full.
Forgetting which read what can be an issue!

I made sure that when I put the new sending unit in that I cleaned the ground on the frame good. Are there any other grounds I should check? It's strange that these would have a reputation for not being accurate but what you are describing with your vehicles is pretty much my situation.

 

[Bob H]

The dash wiring also needs a good ground as well as battery to frame.
Perhaps the float to coil relationship on the sender needs 'adjusting'
This is just where I'd start looking. Hopefully someone that knows will chime in here.

 

[nattieleather]

Check the TM and see if it says anything on trouble shooting the fuel system. It may give you what you need to get it closer to accurate.