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[Dave69]

just a simple question,

typical fuel gauge not working.

to check is this a simple case of disconnecting the sender and the gauge should rise to show full (O/C)

Which part normally fails, sender or actual gauge?

[Bulldog67]

Oooooh i know I know

this the sender

[j33pky]

Now let ade have the computer back Mrs bulldog

[eastryjeep]

Nah, I've been through at least 3 gauges on my CJ7.
What usually happens is that the ballast resistor in one of the two gauges (cant remember which, but Lightys will tell you) fails and either one or both of them burn out. Or the damn things get too much condensation on them and short themselves out all on their own!
Never had a fuel sender pack up in more than 30 years of owning the same Jeep!
Regardless of that, a few mins with an AVO meter will tell where the fault lies. If you really want to check the fuel sender empty, then drop the tank, remove the sender and test that the resistance reading changes as you move the float arm up and down.
However if it were me, I'd check the instrument cluster first for a good earth, then the gauges themselves, then put the meter on the fuel gauge wires behind the dash and check for change in resistance as you feed in a few litres of fuel, then do the same again at the sender to check the integrity of the wires to the dash.
Once youve found the problem bear in mind that the loom in a CJ isnt exactly new and you may want to take the opportunity to replace the old wiring or at least renew the connectors.

[Bulldog67]

Now let ade have the computer back Mrs bulldog

 

and who wins then Dave

[Dave69]

don't really want to drop the tank at this time of year so i will pursue the gauge connections and wiring then see what happens

[Bulldog67]

Should be a hole in the tub to access the sender unit

[Nosebolt]

Should be a hole in the tub to access the sender unit

no there shouldn't, least not on any CJ I've worked on

[eastryjeep]

And I dont remember saying anything about dropping the tank being an easy job, but certainly no simple access panel from above in a CJ, maybe you could take that as testament to how reliable the sender is?
Make no mistake though, that skid plate under the tank is damn heavy!
So dont say you weren't warned eh!

[Bulldog67]

Should be a hole in the tub to access the sender unit

no there shouldn't, least not on any CJ I've worked on

weird, mine does

I guess its just cooler than yours 

The Chief has one as well as the AMC senders are wank - which is why I just had that one replaced as well

Perhaps its a V8 v ghay engine thing

[bigjeepzj]

you don't need a fuel gauge in the chief
you just fill up every time you pass a petrol pump

[bigjeepzj]

sorry you do

[Bulldog67]

jerry cans

[Bubba]

Its not the sender  not normaly its the gages they are paired and the voltage regulater/stabaliser has sex with it self and then that it somtimes nithere work but the fuel one always fails

[Bubba]

Should be a hole in the tub to access the sender unit

Not in a cj7 in an8 yes

[Bulldog67]

good job I never bought that sender you tried to flog me then

[Dave The Sparky]

Should be a hole in the tub to access the sender unit

Not in a cj7 in an8 yes

An 8 shouldn't have a hole for the sender unit either,like most vehicles its drop the tank time

[Dave69]

hoping for the gauge as the bash plate and tank look a pain to drop due too weight

[Nosebolt]

it's not that bad, 3 bolt on one edge, 4 on the other, 2 pipes from the filler and 2 or 3 small bore pipes up top, just remember to put a jack under it before you take out the bolts.

[Bulldog67]

Just shows why the Chief is superior, bit more thought gone into the build

[Dave The Sparky]

The Chef just a large estate car with a roof and a bit of carpet to cover that access hole, thats the difference.

You may as well of just bought a Volvo...................................................Oh you did

[Dave69]

it's not that bad, 3 bolt on one edge, 4 on the other, 2 pipes from the filler and 2 or 3 small bore pipes up top, just remember to put a jack under it before you take out the bolts.

thats the easy bit, getting it out fixed and back again before the monsoon season restarts is the tricky bit

[Nosebolt]

it's not that bad, 3 bolt on one edge, 4 on the other, 2 pipes from the filler and 2 or 3 small bore pipes up top, just remember to put a jack under it before you take out the bolts.

thats the easy bit, getting it out fixed and back again before the monsoon season restarts is the tricky bit

 

know what you mean, it's a bitch not having permanent use of a workshop

[Dave69]

bugger now noticed i need to replace the axle seal. as diff oil has now contaminated the rear shoes

[eastryjeep]

Err, how many feet you got then Dave?