Gas Gauge

BB33's · Oct 15, 2008

Heys guys on my '95 Bronco (see signature) the gas gauge likes to sway and jump around and does not settle on one reading for long. Also it will read low at a stop but when cruising it will read about an eight of a tank higher. What gives? is my sending unit bad or should I look at replacing the gauge?

Seabronc · Oct 16, 2008

Check the connections first, but it sounds like a bad sender. You have to drop the tank to change the sender or very carefully cut an access panel in the back deck. Here is how I did mine http://broncozone.com/forums/index.php?showtopic=12329 . If you are not good at controlling a saw, then make one while the tank is down for the next time you need to access it.

Good luck,

>-

jsomedaysoon · Oct 16, 2008

about how big was that hole... it looks like maybe 12x 12 ?

Seabronc · Oct 16, 2008

jsomedaysoon said:
about how big was that hole... it looks like maybe 12x 12 ?

Within a few millimeters B)

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jsomedaysoon · Oct 16, 2008

i might try that on the 86, the gauge hasent worked since i got it.

BB33's · Oct 16, 2008

Thanks for the good info SeaBronc. I think I might just drop the tank if I need to (yes i'm afraid that i'm gonna hurt my baby). But how can I be sure it's the sending unit? Oh! this morning the gauge jumped up to 3/4 of a tank and jumped between that and full then when I shut the truck off it fixed itself. It still sways but the unusually high reading had me thinking it is the gauge.

Seabronc · Oct 17, 2008

I'll get back to you with a diagram of the circuit tonight. Start by checking the connection to the sender. Remove the connector, (easier said than done), and check the contacts for corrosion. It could be a bad ground also, but that would probably show up in all the instruments.

Good luck,

>-

jsomedaysoon · Oct 17, 2008

i dont mean to highjack this thread or anything but thats more like what i've got. non of my gauges work. where would i look for the ground for the gauges?

Seabronc · Oct 17, 2008

jsomedaysoon said:
i dont mean to highjack this thread or anything but thats more like what i've got. non of my gauges work. where would i look for the ground for the gauges?

I'd check the Instrument panel voltage regulator first. The easiest way to get at it would be to take the dash pad off. The IVR is mounted on the back of the panel on the top left side. Use a voltage meter to check it, it should have about 5V out to the gauges. The ground is on the firewall support under the dash near the driver's right foot. If you are checking grounds, check that you have a good connection from the fire wall to the engine intake manifold, there should be a braided strap from there to the fire wall. You may want to clean the lugs and contact area up. It will also help from a grounding standpoint if there is a good ground from the engine block battery (-) connection to the frame.

>-

Seabronc · Oct 17, 2008

The previous post was for jsomedaysoon. Here is the diagram for your 95. G100 is near the bottom of the engine compartment diagram on the right side.

Good luck,

>-

shift1313 · Oct 19, 2008

in the few different trucks that i have/had i have never had a gauge settle on me. They always move around. Newer vehicles have a "delay" or "average". Just like the voltmeters in these trucks. When your turnsignal is on, the volt meter pulses. Newer vehicles dont do that because people were concerned something was wrong.

I know in my pickup when i go around a left turn i have more gas, and a right turn i have less gas, same thing with up/down hill. Also the shape of the tank isnt symetrical so your gauge will tend to stay longer in the 1/2 to full range than the E to 1/2 range.

I could be off but all the ones ive ever had/driven have been this way for me and i havent had one quit yet.

BB33's · Oct 19, 2008

Good lookin' Seabronc. The underhood ground (G100) was totally frayed. I cut the frayed end an reattached it to the core support and viola! Thanks a bunch'

Seabronc · Oct 20, 2008

shift1313 said:
in the few different trucks that i have/had i have never had a gauge settle on me. They always move around. Newer vehicles have a "delay" or "average". Just like the voltmeters in these trucks. When your turnsignal is on, the volt meter pulses. Newer vehicles dont do that because people were concerned something was wrong.
I know in my pickup when i go around a left turn i have more gas, and a right turn i have less gas, same thing with up/down hill. Also the shape of the tank isnt symetrical so your gauge will tend to stay longer in the 1/2 to full range than the E to 1/2 range.

I could be off but all the ones ive ever had/driven have been this way for me and i havent had one quit yet.

I'd check into that, mine doesn't do that and the reading is pretty much right on, especially since I went thought the connections and put in a better ground. The sender float may have a problem, could be bad. It is located at the center of the tank in order to minimize the effects of sloshing.

>-

shift1313 · Oct 20, 2008

even with the over-the-spare small 14gal tanks?(f150) I definitely notice the sway in my truck more than the bronco. ill definitely check into the grounds though.

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