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Gas Gauge not working?


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#1 coupe66

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Posted 05 January 2006 - 07:42 PM

The gas guage on my 74 bronco does not work on with either tank . Any ideas on if it would be the gauge or the sending units . Also would I be able to buy the rubber filler hoses for both tanks at a local parts store . Thanks Robert <)style_emoticons/default/cowboy.gif

#2 Seabronc

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Posted 05 January 2006 - 07:54 PM

Sending units are usually the problem, but could be connections also. Check the voltage at the connector for the sender unit. It should be around 5 to 7 volts if my memory serves me right. You should be able to get the hoses from a place like LMC Truck http://www.lmctruck.com .

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#3 Bully Bob

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Posted 06 January 2006 - 06:49 AM

There is a voltage drop (volt. regulator) attached to back of the instmt. panel. It allows 6volts only to the fuel gage & oil press.
If the oil press. gage is working, then the volt. reg. is ok.
The tank "switch-over" switch may be disconnected. (these wires can fall off)
The wire(s) may be off the gage itself as well.
Lastly, you can carefully remove the senders & test them.

Edited by Bully Bob, 06 January 2006 - 06:50 AM.

---Jeep recovery unit---
1966 "U-13" Roadster...topless, doorless. (with rag top-n-doors)
200 cu.in. I-6 with 250 head.
$30 homemade HEI elect. ignition.
Pwr. steering, Hurst 3-speed floor shifter.
Split headers, dual exhaust, Holley 1 brl.
Stock axles...456's...32's ...Posi rear. 2.5 in. lift.
Full roll-cage, front.
65 gallons of fuel on board..!
70+ MPH cruise---15 MPG
6 EB's (& 11 early Land Cruisers) referbished & sold..

#4 Guest_kts75bronc_*

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Posted 10 January 2006 - 09:53 AM

If you are talking about the hose that goes from the filler neckto the tank, I got some from NAPPA last week.

#5 coupe66

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Posted 10 January 2006 - 06:30 PM

I checked the switch for the tanks and it only had one wire hooked up to it . How many wires go hooked up to it . Is there a wiring diagram on line somewhere that I can look at . The switch has a few connections but no markings . Thanks Robert

#6 Bully Bob

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Posted 13 January 2006 - 07:34 PM

Off the top of my head,
There should be a wire coming from ea. tank....to the switch.
Then, 1 wire up to the volt. reg. on the back of gage cluster.
---Jeep recovery unit---
1966 "U-13" Roadster...topless, doorless. (with rag top-n-doors)
200 cu.in. I-6 with 250 head.
$30 homemade HEI elect. ignition.
Pwr. steering, Hurst 3-speed floor shifter.
Split headers, dual exhaust, Holley 1 brl.
Stock axles...456's...32's ...Posi rear. 2.5 in. lift.
Full roll-cage, front.
65 gallons of fuel on board..!
70+ MPH cruise---15 MPG
6 EB's (& 11 early Land Cruisers) referbished & sold..

#7 coupe66

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Posted 13 January 2006 - 08:32 PM

Thanks for the help but the back of the switch has 6 tabs to hook up to and how do I know which ones are used and where ? Does any one have a good wire diagram ? [-o< Thanks

#8 coupe66

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Posted 17 January 2006 - 07:40 PM

Has anybody had a chance to see how the wires to the switch are hooked up ? Or know of a good wiring diagram online to look at ? Thanks :-B

#9 wdetzi

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Posted 24 January 2006 - 08:01 PM

Here's an electrical and picture diagram from a 70 Bronco manual, hope it helps

Fuel_Gauge_Wiring_Dia.jpg

Fuel_Tank_gauge_pic.jpg

#10 wdetzi

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Posted 24 January 2006 - 08:34 PM

Sorry about those diagrams - didn't mean to send them mega-size such that they were unreadable - I'll try again, hope it works better this time.

Fuel_Gauge_Wiring_Dia_2.jpg

Fuel_Tank_gauge_pic_2.jpg

#11 coupe66

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Posted 25 January 2006 - 08:07 PM

Thanks for the wiring diagram . I found the wires under the dash just hanging there . I know my aux tank sending unit works for sure and when I install my new main tank hopefully it will work as well . Thanks Again :)>- Robert

#12 66broncoman

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Posted 17 February 2006 - 05:10 PM

im having the same problem with my 66 bronco. it says its on emptey all the time.

#13 Bully Bob

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Posted 17 April 2006 - 07:44 AM

Check for current at the sending unit wires....& check the connections on dash & on the back of the instmt. cluster. B)
---Jeep recovery unit---
1966 "U-13" Roadster...topless, doorless. (with rag top-n-doors)
200 cu.in. I-6 with 250 head.
$30 homemade HEI elect. ignition.
Pwr. steering, Hurst 3-speed floor shifter.
Split headers, dual exhaust, Holley 1 brl.
Stock axles...456's...32's ...Posi rear. 2.5 in. lift.
Full roll-cage, front.
65 gallons of fuel on board..!
70+ MPH cruise---15 MPG
6 EB's (& 11 early Land Cruisers) referbished & sold..

#14 Hotfeet

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Posted 24 September 2017 - 07:37 PM

Is this diagram the same for a 66?

#15 Bully Bob

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    Hot women, 4x4'n, flying homebuilts -- or -- a nice Super Cub !
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Posted 29 September 2017 - 05:16 PM

Hi Hotfeet.., welcome...

 

Yes...,  This diagram is from a 1967 Factory manual.  (assuming that's a copy of my post in the past)

 

His is a '70 catalog but is the same...............


---Jeep recovery unit---
1966 "U-13" Roadster...topless, doorless. (with rag top-n-doors)
200 cu.in. I-6 with 250 head.
$30 homemade HEI elect. ignition.
Pwr. steering, Hurst 3-speed floor shifter.
Split headers, dual exhaust, Holley 1 brl.
Stock axles...456's...32's ...Posi rear. 2.5 in. lift.
Full roll-cage, front.
65 gallons of fuel on board..!
70+ MPH cruise---15 MPG
6 EB's (& 11 early Land Cruisers) referbished & sold..



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