55 fuel gauge always shows full

[zeroroadkill]

Fuel gauge always shows full. new sensor, checked all wires/grounds. Is there an adjustment on the gauge?

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[tbird]

When you post, summarize your post.
"55 fuel gauge" could mean anything. Updated to "55 fuel gauge always shows full"

This has been discussed in the past- https://forums.fordthunderbirdforum.com/threads/1956-bird-gas-gauge-always-says-full.7240/

 

[doug7740]

When you said that you checked all wires and grounds, please explain how you did this.

From the fuel gauge there is a yellow wire that runs to the fuel tank sending unit. With the key, on what did the gauge read when the wire at the sending unit was disconnected? What did the gauge read when the wire at the sending unit was grounded momentarily? (Note: do not ground the wire at the sending unit for more than 10 seconds or damage to the gauge could result)

The fuel and temperature gauges can be calibrated, but if your gauge is always reading full, calibrating the gauge will not correct your problem.


Attached is an article that I wrote on adjusting the fuel and temperature gauges on a 1955/1956 Thunderbird.

doug7740
1955 Thunderbird Blue