Gas Gauge

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Dec 3, 2022 | 10:01 PM

Huskerconan

Thread Starter

4th Gear

Joined: Oct 2022

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Gas Gauge

Recently purchased a 55 f100. The truck is in good shape just trying to fix a few small things. One is the fuel gauge. Goes to full when started. Original 6v system but was changed to 12v. Will I get the same reading with voltage changed? Kinda planning on replacing sending unit but wondering if I need a new 12v or original 6v. Thanks Cliff

Dec 3, 2022 | 10:40 PM

Scottydog1001

Cross-Country

Joined: Feb 2020

Posts: 85

Likes: 29

From: Manchester Wa.

I had to replace my fuel sending unit going to 12v.

Dec 4, 2022 | 02:45 PM

sik9d1

Trailering

Joined: Dec 2022

Posts: 18

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From: Somis, CA

Where the gauges swapped out for 12 volt versions or a 12 to 6 volt converted used on them?

Dec 4, 2022 | 03:32 PM

Scottydog1001

Cross-Country

Joined: Feb 2020

Posts: 85

Likes: 29

From: Manchester Wa.

My gauge was swapped out also.

Dec 4, 2022 | 04:49 PM

sik9d1

Trailering

Joined: Dec 2022

Posts: 18

Likes: 7

From: Somis, CA

Quote:

Originally Posted by Scottydog1001

My gauge was swapped out also.

You can use a 6 or 12 volt fuel sender. The sender is just a potentiometer and sends the correct ohm signal to the gauge. Just make sure the the sweep on the sender meets the same as the gauge wants to read full or empty correctly.

Dec 4, 2022 | 04:54 PM

Huskerconan

Thread Starter

4th Gear

Joined: Oct 2022

Posts: 4

Likes: 1

Not sure if gauges were swapped out. How would I go about figuring that out? Thanks

Dec 4, 2022 | 05:02 PM

sik9d1

Trailering

Joined: Dec 2022

Posts: 18

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From: Somis, CA

Quote:

Originally Posted by Huskerconan

Not sure if gauges were swapped out. How would I go about figuring that out? Thanks

Is there 12 volt going directly into your gas gauge or there some type of 12 volt to 6 volt step down?

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Dec 4, 2022 | 06:49 PM

truckeemtnfords

Logistics Pro

Joined: Nov 2006

Posts: 3,671

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From: Fallon,NV & Bainbridge OH

My 6v-12v conversion used the 6v gauge and sending unit and read correctly.

Dec 5, 2022 | 06:46 AM

#10

Huskerconan

Thread Starter

4th Gear

Joined: Oct 2022

Posts: 4

Likes: 1

Quote:

Originally Posted by truckeemtnfords

My 6v-12v conversion used the 6v gauge and sending unit and read correctly.

thanks for the info. Thinking its the sending unit just looking for others experiences. Thanks

Dec 5, 2022 | 07:24 AM

#11

Greg Rogers

Fleet Mechanic

Joined: Jun 2015

Posts: 1,872

Likes: 294

From: Central Michigan

My "56" has a 55 tank and sender. When I put it all together with 12 volt dash/gauge for 56 it works!! so I would just try it and see, may work fine.....