68 fuel sending unit replacement
Team Owner
Joined: Jul 2004
Posts: 40,408
Likes: 792
From: Redondo Beach, California
Don't know how helpful my answer will be. I replaced the entire fuel tank and replaced the fuel sender unit. Actually, it's a relatively easy job to replace the fuel sender unit with the tank in the car. I think you have to remove the spare tire carrier assembly. You need to see the bottom of then tank. Then you need to buy a fuel sender remover tool...they're only a few bucks. I think I bought my new fuel sender from Quanta and they sell the tool also. Just unloosen the old one and screw in the new one.
You have to remove all the gasoline from the tank. Drain out the tank and blow out the tank with compressed air to remove fumes. Or just wait for a while for the fumes to go away. Or drop chunks of dry ice into the empty tank to deplete oxygen from the tank fumes..What ever.. An empty tank with gasoline fumes and air, if its at the correct air to fuel ratio, is just like a giant stick of dynamite.
You have to remove all the gasoline from the tank. Drain out the tank and blow out the tank with compressed air to remove fumes. Or just wait for a while for the fumes to go away. Or drop chunks of dry ice into the empty tank to deplete oxygen from the tank fumes..What ever.. An empty tank with gasoline fumes and air, if its at the correct air to fuel ratio, is just like a giant stick of dynamite.
2026 Loser of the Year
Joined: Sep 2013
Posts: 36,597
Likes: 7,046
From: New Or-leens Loo-z-anna
Put a fire extinguisher nearby....
wearing safety glasses would be a good idea.....
disconnect the battery negative cable.....
siphon the gas out of the tank into a good container....
unplug the electrical connections to the sending unit......
put a clean oil-change pan under the tank so that any remaining gas will pour into the pan as you remove the round lock-ring that holds the sending unit in place.......
the new unit fits a certain way in the tank in order for the float to move properly.....
be sure to buy a new seal/o-ring to prevent gas from leaking when the new unit is installed
Since I am a rookie....wait for expert members to provide better information
Team Owner
Joined: Sep 2006
Posts: 31,273
Likes: 4,366
From: Westminster Maryland
Hi G,
Good info!
I'll add:
Be prepared to deal with the gas that may still be in the rubber line to the steel fuel line clamped to the sender. It will begin to run out as you loosen the clamp on the rubber hose.
When installing the new 'ring' that seats the sender, notice that the prongs on the ring must be seated tightly against the 'stops' on the sender in order to ensure a good seal.
Since you have the opportunity install a new piece of rubber fuel line too.
Regards,
Alan
Good info!
I'll add:
Be prepared to deal with the gas that may still be in the rubber line to the steel fuel line clamped to the sender. It will begin to run out as you loosen the clamp on the rubber hose.
When installing the new 'ring' that seats the sender, notice that the prongs on the ring must be seated tightly against the 'stops' on the sender in order to ensure a good seal.
Since you have the opportunity install a new piece of rubber fuel line too.
Regards,
Alan
Racer
Joined: Feb 2013
Posts: 364
Likes: 39
From: Sebastian FL
Melting Slicks
Joined: May 2003
Posts: 2,387
Likes: 2
From: Meriden CT
Once you get the sending unit out and the tank breathes for a while, you might as well get a flashlight and do a good internal inspection to check the condition of your tank.
Now would be a good time to replace it if needed.
Now would be a good time to replace it if needed.
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Thread Starter
Racer
Joined: May 2009
Posts: 316
Likes: 1
Before going ahead with the sending unit replacement. Does it seem reasonable to assume the sending unit is at fault if the fuel gauge doesn't go below half full even when the tank is almost empty? Just wondering if the fuel gauge is at fault rather than the sending unit.
Pro
Joined: Feb 2014
Posts: 692
Likes: 2
From: Seguin TX
http://www.lbfun.com/warehouse/tech_...g%20gauges.pdf This is a very good article to help you make that determination.