Author Topic: Fuel Tank / Sending Unit Replacement  (Read 49 times)

Offline RedKing7

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Fuel Tank / Sending Unit Replacement
« on: October 03, 2021 - 12:17:27 PM »
It's been awhile since I've been on this site. I hope that someone can help me or point me in the right direction.

I have a '72 Challenger Rallye; I'm the original owner.

I'm having trouble getting gas out of the tank / sender unit.

Can anyone weigh in on experiences in replacing the tank / sender unit?  Can I replace the sender unit without removing the fuel tank?  With this being the original tank, should I replace it with a new one because of potential sludge issues?

I've looked at some so-called new fuel tanks out there on the web, but none seem to be an exact duplicate of what I have.

Thanks.




Offline 70chall440

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Re: Fuel Tank / Sending Unit Replacement
« Reply #1 on: October 03, 2021 - 11:21:26 PM »
If you think there is "sludge" in the tank, then it needs to come out. It isn't that hard, remove the rear valance, disconnect the fuel line and fuel gauge wire, support the tank and remove the 2 9/16 strap nuts.

To your question, you should be able to remove the sending unit without dropping the tank. You might want to put an electric pump on the fuel outlet and see if it pulls fuel before removing the sending unit, it might be something else like a blocked line, bad pump, plugged filter, etc.
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
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Offline JayBee

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Re: Fuel Tank / Sending Unit Replacement
« Reply #2 on: October 04, 2021 - 08:24:00 AM »
Can I replace the sender unit without removing the fuel tank? 
If that's all you're interested in doing then absolutely. I've done it numerous times. Just make sure you're well below 1/2 tank of gas. Some have removed the left tire also.
John

1970 Barracuda convertible
2000 Toyota Avalon

Offline RedKing7

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Re: Fuel Tank / Sending Unit Replacement
« Reply #3 on: October 04, 2021 - 04:33:48 PM »
Thanks 70chall440 and JayBee.

I did connect an electric fuel pump to the line coming out of the fuel sender unit (very near the tank) and could only get a few drops out.

Will try to remove the sender unit after I remove the left-side muffler to get a little room to work. Will see where that goes.

Offline 70chall440

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Re: Fuel Tank / Sending Unit Replacement
« Reply #4 on: October 04, 2021 - 11:26:37 PM »
Its not all that hard but you need to use a brass or piece of wood to rotate the locking ring so that you don't create any sparks seeing that you are right there at the tank. The ring rotates counterclockwise (as I recall) about a quarter turn and then should be free. Once you have that loose, then you can pop the sending unit out. It will have to be twisted a bit to get out because the pickup tube is bent at an angle (so that it is parallel to the bottom of the tank when seated).
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)