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Unread 12-01-2013, 09:01 PM   #1
Gigemags05
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Fuel Tank Questions: Sending unit, and random hole

I'm replacing the bed portion of my jeep and decided to drop the tank while I'm at it and replace the fuel sending unit.

The PO of the jeep had this fuel sending unit that he was going to put into the jeep but never got around to it. It looks different than the pictures of sending units I've seen online. Will it still work even though the line fittings are pointing differently? Are other parts the same?









Also, when removing the tank, we noticed a perfectly round hole in the top of the tank. Directly under where the seat belt is mounted on the bed of the jeep. Surely that isn't supposed to be there, right? If it isn't, any ideas of how to properly plug it?




Anything else I should change while the tank is on the ground?

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Unread 12-01-2013, 09:03 PM   #2
Gigemags05
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One other question... am I correct in assuming that I need to put a filter on the pick up tube?
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Unread 12-02-2013, 02:04 AM   #3
John Strenk
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If you have an ohm meter, I'd check the resistance first. Make sure it's compatible with a CJ fuel sending unit.

The hole looks like someone drilled through the floor of the CJ and hit the tank. Not sure how to fix it, Maybe glue a metal slug over it with a fuel resistant epoxy?

The pick up filter extends the pickup of the tank so yeah, it's needed.
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Unread 12-02-2013, 02:38 AM   #4
BagusJeep
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As John said the thing will fit but it is the reading it will give you that matters. The orientation of the tubes wil not matter at all.

The pick up filter does extend it but I seem to be blessed with Jeeps where POs have all opted for a short length of fuel hose on the end zip tied on. They reach to the bottom all right but a lot of gunge gets in.

That is not a factory hole but is certainly drilled.
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Unread 12-02-2013, 07:27 AM   #5
ScroungerLee
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I would seal that hole with http://www.jbweld.com/product/j-b-waterweld/ which can be used for fuel tanks. I have used it for this with great success. It can even be used to plug a hole while it is leaking, although I haven't tried that.
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Unread 12-02-2013, 10:29 AM   #6
Gigemags05
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Does anyone know what resistence it should read?

I have an OHM meter.
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Unread 12-02-2013, 10:38 AM   #7
tdcanada
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0 ohms to 73 ohms I thing for the CJ fuel gauge...0 being full and 73 being empty
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Unread 12-02-2013, 10:41 AM   #8
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I might go with a sheet metal screw the size for the hole with a rubber washer
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Unread 12-02-2013, 10:52 AM   #9
Gigemags05
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Quote:
Originally Posted by tdcanada View Post
0 ohms to 73 ohms I thing for the CJ fuel gauge...0 being full and 73 being empty
I know this is incredibly remedial, but how exactly do I test that?

I've googled it and it didn't come up with a whole lot. I've also tried searching John Strenk's posts but haven't come up with much.
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Unread 12-02-2013, 11:03 AM   #10
John Strenk
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Quote:
Originally Posted by Gigemags05 View Post
I know this is incredibly remedial, but how exactly do I test that?

I've googled it and it didn't come up with a whole lot. I've also tried searching John Strenk's posts but haven't come up with much.
10 Ohms full
73 Ohms Empty.


Take your ohm meter and put one lead on the screw terminal and clip your other lead to the case or tube and move the float up and down.
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Unread 12-02-2013, 11:07 AM   #11
Gigemags05
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alright, when you say case or tube do you mean the pick up tube?

I'm sorry for my ignorance.
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Unread 12-02-2013, 11:16 AM   #12
John Strenk
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Quote:
Originally Posted by Gigemags05 View Post
alright, when you say case or tube do you mean the pick up tube?

I'm sorry for my ignorance.
No problem.

Mounting flange, pick up tube, outlet fitting anything metal.

That black wire riveted to the back or the terminal spot welded to the top would be the best place.
fuelsenderohmmeter.jpg  
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Unread 12-02-2013, 11:18 AM   #13
Gigemags05
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AWESOME! Now that's some direction I can follow.

Thank you very much. Hopefully this will save me $50.
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Unread 12-02-2013, 11:42 AM   #14
John Strenk
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Post your results if you will.

Just to let us know how that style works.
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Unread 12-02-2013, 11:57 AM   #15
Gigemags05
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will do.
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