Fuel Gauge not working (shocker, I know...)

[Xcudame]

The "box" hanging from the top is an expansion tank (emissions) that is on all 71-74 tanks and California 70 tanks. That's why 70 federal tanks are 19 gallon and the rest are 18 gallons. By the way I think there's a new tank for sell on this forum.
FOR SALE - 1970-74 New Fuel Tank

 

[EW1BH27]

The one for sale looks to have only one vent tube (1970). If it's for a 1971 I thought there's suppose to be 4 vent tubes. Check out the last picture in the link.

CR8E

Spectra Premium believes in a green and sustainable economy. That's why it uses its core competencies of metallurgical transformation, heat transfer and high quality assembly capacity, as well as its extensive expertise, to stand out in the booming vehicle electrification sector in Quebec.

ecat.spectrapremium.com

 

[moparlee]

The one for sale looks to have only one vent tube (1970). If it's for a 1971 I thought there's suppose to be 4 vent tubes. Check out the last picture in the link.

http://[URL]https://ecat.spectrapremium.com/en/parts/CR8E

[/URL]

Correct, my 71 Challenger has the 4 vent tube tank.

 

[Xcudame]

You're right, the tank for sell here is for a 70. Not being a purist, I'd run a 70 tank and pick up the extra gallon capacity. But to each his own.

 

[EW1BH27]

I'd run a 70 tank and pick up the extra gallon capacity.

Excellent idea.

 

[ColoradoCuda]

Any tips on tank removal / installation? I assume pull the filler neck out first? I was thinking I should order a new filler neck because mine has a dent in the tube visible in the trunk, but looking at a new one, it has that too. Weird. Also, why is there 4 vent tubes on the top of the tank? Is there something different about each one?

 

[Challenger RTA]

Just putting this out there. In for a penny in for a pound.

3/8 Fuel Sending Unit Cuda Challenger 70 71 72 73 NEW E Body S845.​

 

[heminut]

Just putting this out there. In for a penny in for a pound.

3/8 Fuel Sending Unit Cuda Challenger 70 71 72 73 NEW E Body S845.​

If that is supposed to be a link to something it doesn't work.

 

[Steve340]

The four vent pipes go to the factory fuel tank vapor saver system. The four tubes are connected to the vapor liquid separator located up in the trunk.
The system description and layout diagram are in the 1971 factory service manual.

 

[Challenger RTA]

If that is supposed to be a link to something it doesn't work.

No just a part number I found on Ebay. Thanks.

 

[Challenger RTA]

Any tips on tank removal / installation? I assume pull the filler neck out first? I was thinking I should order a new filler neck because mine has a dent in the tube visible in the trunk, but looking at a new one, it has that too. Weird. Also, why is there 4 vent tubes on the top of the tank? Is there something different about each one?

Yes and Yes to what you said. It makes it easer.

 

[EW1BH27]

mine has a dent in the tube visible in the trunk, but looking at a new one, it has that too. Weird.

Yeah, that's normal. A long time ago I read there was a reason for that but I can't remember what it was - sorry.

 

[michael bucklew]

The part that Challenger RTA showed is the correct one, but if you are not concerned with the correct appearance, or if you just want to test things, you can obviously use any short length of copper wire or similar conductor to create a ground connection between the body and the sending unit.

The part that Challenger RTA showed is the correct one, but if you are not concerned with the correct appearance, or if you just want to test things, you can obviously use any short length of copper wire or similar conductor to create a ground connection between the body and the sending unit.

with the heat shield and muffler in place. cannot see without nmirror

 

[michael bucklew]

Yes and Yes to what you said. It makes it easer.

View attachment 113590

Yes and Yes to what you said. It makes it easer.

View attachment 113590

filler neck first, the all those lines going to tank. does your car have the vapor recovery device in the trunk???? I bought a new 5 hose tank. installing was easy. those hoses line up with each other. one line is a vent that goes to the engine compartment...back in '71 it was hooked up to the PVC system...now it is a vent when filling tank...PVC is not needed--epa crap. just get a breathable cap. cars had those long before the epa

 

[Challenger RTA]

Yes.

Fuel Vapor Bulkhead

I’m starting restore on my 71 Challenger. I’m doing the fuel tank and lines first so I can start the engine. I didn’t want to start it with a gas can. My question is about the vapor bulkhead in the trunk. The original one is all rusted out. Is there an OE replacement for it or do I have to buy...

www.forebodiesonly.com

 

[michael bucklew]

Yes.

http://[URL]https://www.forebodiesonly.com/forum/threads/fuel-vapor-bulkhead.32148/#post-187426

[/URL]View attachment 119618

don't know. try. Mo-Par City. 815 732 7751. Hughe parts yard.

 

[michael bucklew]

To check the wiring and the actual gauge pull off the blue wire and ground it somewhere. Then turn the ignition key to ACC (or ON, but not start). The gauge's needle should peg to full. BUT, don't leave the key in the ACC (or ON) position for long, only long enough to see the needle move. Otherwise you could damage things.

ok, will try--BUT---my wire is black---orgional harness in back of car

 

[michael bucklew]

The in tank unit is probably faulty - you may need to have it rebuilt or replace it.
Run the gas tank empty before you try and remove it and buy one of those sender tools they are awesome.

brand new

 

[Challenger RTA]

It's dark blue. You may not have enough light, or it's just discolored, someone replaced the wire or you are color deficient.

 

[Challenger RTA]

don't know. try. Mo-Par City. 815 732 7751. Hughe parts yard.

Click on the link that I responded with. I don't need the part.