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Fuel Tank Sending Unit (5 hole style sending unit)
Fits 46-66 CJ-2A, 3A, 3B, M38, M38A1

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Fuel Tank Sending Unit (5 hole style sending unit)
Fits 46-66 CJ-2A, 3A, 3B, M38, M38A1

New Fuel Tank Sending Unit

Comes complete with mounting gasket. Float sits inside tank to give accurate reading to gauge. For 6 or 12 volt systems. Proper arm length guaranteed for a sure reading.

This sending unit is attached to the top of the fuel tank with five screws (B0305).

Fits:
46-49 CJ-2A
49-53 CJ-3A
53-56 CJ-3B (with individual gagues)
50-52 M38 (12 volt)
52-66 M38A1 (12 volt)

Item # Price
640694
$39.99

Availability: In stock

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Questions & Answers

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Questions: Do I need to ground the sending unit? My 53 M38A1 is 12 volt and always registers full even when tank is half full.
Question By: Don Edwards on Jul 27 2018 9:18 PM
Yes, this sending unit for 6 or 12 volt system needs to be grounded. Thanks
Answer By: Willys Jeep Parts Tech on Jul 30 2018 6:03 AM
Questions: What gauge wire is used for this sending unit? Thanks
Question By: Chin on Jun 18 2018 2:57 PM
16 gauge.
Answer By: Willys Jeep Parts Tech on Jun 19 2018 6:09 AM
Questions: The fuel tank in my M38A1 looks like it has been replaced. It doesn’t have a hole for a sending unit. Can I drill a hole and add a sending unit and if so what size hole and what sending unit?
Question By: Alan on May 10 2018 11:19 PM
I guess you'll have to drill the hole if you don't have one because how else are you going to read the amount of fuel in the tank. Just make sure you don't let any small pieces of metal fall into the tank. Once that happens, the fuel will push it along the fuel lines and into the fuel pump and carburetor. Thanks
Answer By: Willys Jeep Parts Tech on May 11 2018 5:12 AM
Questions: What is the proper resistance range of this float assembly? I took my inoperable one apart to check the winding and I'm only reading 0 to 35 ohms (empty to full). Even a low resistance float usually reads around 0 to 90 ohms. I doubt this is a 33-240 ohm high resistance unit but I need to know so I can use it with the proper aftermarket gauge.
Question By: Bob Kudamatsu on Nov 1 2017 4:04 AM
7-9 Full and 130-140 Empty
Answer By: Admin on Nov 1 2017 5:47 AM
Questions: I have a 6 screw holes unit down on the tank. Do you have available a 12 volt sending unit?
Question By: Freddy Vargas on Sep 16 2017 1:36 PM
This works on both 6 and 12 volt systems. It works on resistance. You just need to make sure your gauge in the dash is 12 volt.
Answer By: Willys Jeep Parts Tech on Sep 18 2017 5:45 AM
Questions: I have a new gauge and new sending unit both purchased through you and my gauge reads 1/2 full when empty. It seems as though the sender is backwards and should have 1.5 Ohms when empty and 48 ish ohms when full but this one is backwards.
Question By: Reid Nordin on Sep 10 2017 2:24 AM
Please double check the wiring and ensure you have a good ground. They are also adjustable on the tabs that bottom out the arm on the sender. Please call us toll free too and we can help. If you 12 volt you also need to make sure your gauge is 12 volt too.
Answer By: Willys Jeep Parts Tech on Sep 11 2017 11:09 AM
Questions: Will this fuel tank sending work work in fuel tank of an M170? I know that the tanks are completely different. The M170 that I am working on has been converted to 12v.
Question By: Bill Lane on May 20 2017 7:02 PM
It may. As long as you have five screw holes that hold the sending unit down on the tank. The arm length can be modified. Thanks!
Answer By: Willys Jeep Parts Tech on May 22 2017 5:14 AM
Questions: CJ2A new fuel gauge and sending unit-12V system. Needle on fuel gauge is erratic, mostly reads full but bounces around a bit depending on engine speed which makes me think the voltage getting to the gauge may be too high..I have a ground to frame from the sending unit as well as ground to frame on the back of the gauge via the ground post. I've tried a ground to frame from the sending unit as well as having the ground on the back of the gauge connected to the frame-any other thoughts-should there be an instrument voltage regulator or are these gauges designed to run on a full 12 volts? I've checked my alternator, the voltage is as it should be..
Question By: Michael W Stewart on Apr 24 2017 12:37 AM
Make sure you are grounding back to the battery. Call us toll free and we can help out too.
Answer By: Willys Jeep Parts Tech on Apr 24 2017 5:54 AM
Questions: I have a CJ-3A and the origenal sending unit has 6 holes do you have one that would fit that?
Question By: Lane M Ahlschlager on Sep 8 2016 10:29 PM
If your a CJ-3A you should be a 5 hole sending unit so most likely you have an unoriginal tank out of an early CJ-5. I would go with part number: 914850 which is a 6 hole.
Answer By: Willys Jeep Parts Tech on Sep 9 2016 5:47 AM
Questions: My 53 M38A1 has 6 screws this has 5 how will it bolt up?
Question By: Sam on Jul 12 2016 1:13 PM
The M38A1 should only have a 5 screw sending unit installed. Please email photos of your tank to mike@kaiserwillys.com something is unoriginal on the vehicle.
Answer By: Willys Jeep parts Tech on Jul 12 2016 9:26 AM
Questions: Will this work to hold the two lever boot down on a CJ 3B?
Question By: Rocky on Jun 5 2013 12:00 AM
B0817 will work perfectly for the retaining ring for the transfercase.
Answer By: Willys Tech on Jun 6 2013 12:00 AM
Questions: My 1950 restored willys jeepster fuel gauge reads one half only when gas tank is full. Car is 6 volt system. Have a vintage wood boat whose gas gauge does the same thing and it is six volts also. What' the explanation?
Question By: Anonymous on Jun 5 2014 12:00 AM
You may need to adjust your fuel tank sending unit and check it with a ohm's reader.
Answer By: Willys Tech on Jun 5 2014 12:00 AM
Questions: My M38 tank is 7 7/8 or so deep. In a reply to another question, you said for an M38A1 they might have to lengthen the arm. Is this arm sized for a 13 gallon tank and does it reach down 7 7/8 inches?
Question By: Matt on Mar 11 2014 12:00 AM
800201 is the sending unit you want to use for the M38
Answer By: Willys Tech on Mar 11 2014 12:00 AM
Questions: I have a 53 m38a1 converted to 12 volt . I have a new tank and just ordered the 640694 fuel sending unit and need to replace 24 v fuel gauge in panel for 12 volt.Which 12 v gauge will fit in panel and how should it be wired to fuel unit in tank. Also, do you know if arm should be extended on fuel unit (bent down) to read accurately in tank?
Question By: Bill on Oct 13 2013 12:00 AM
640763-12V would be the dash gauge you need to use.
Answer By: Willys Tech on Oct 14 2013 12:00 AM
Questions: My restoration project is a 1952 M38. It was converted to 12 volt a long time ago. I have been told that this sending unit will work with the M38 fuel tank. Will the arm have to be lengthened and, if so, how long should it be? Thanks, Don
Question By: Don on Dec 12 2012 12:00 AM
Yes this will be the correct one for you. You can lengthen the arm if you like for that tank but really it will read empty and you will still have some fuel left with is good.
Answer By: Willys Tech on Dec 13 2012 12:00 AM
Questions: where does the wire hook on that sends the fuel level to fuel gauge on a 1946 willyz cj2a
Question By: kenneth on Nov 20 2012 12:00 AM
It goes from the sending unit in the tank to the 's' post on the back of the gauge.
Answer By: Willys Tech on Nov 20 2012 12:00 AM
Questions: my question is I installes anew sending unit and a new guage on my cj3a fuel system, but whene Iturn the power on the guage goes way past full.I PUT WIRE from the sending unit to the frame and I still have the same problem. can you help with this problem.
Question By: jim on Oct 3 2012 12:00 AM
Sounds like a ground issue. Check your ground as well as the wiring in back of the guage to confirm it is not arching.
Answer By: Willys Tech on Oct 3 2012 12:00 AM
Questions: Is this sending unit a replacement to be installed in a 53 M38A1 that's been converted to 12V? If not can you suggest another part number? -Thanks
Question By: Anonymous on Sep 19 2012 12:00 AM
Yes this will match up. On the M38A1 you may need to lengthen the arm if you want it to read accurate.
Answer By: Willys Tech on Sep 20 2012 12:00 AM
Questions: just bought '47 cj-2a with this fuel sending unit(item #640694) the the piece that screws into the top of the unit is missing, do I need to replace the whole unit or is that top piece available? Also, is the float cork?
Question By: Bill on May 6 2012 12:00 AM
Sounds like you need a new float. This will do the trick.
Answer By: Willys Tech on May 7 2012 12:00 AM
Questions: does this unit come with new float cant see one in the pic
Question By: garry on Jul 21 2011 12:00 AM
Yes that is correct.
Answer By: Willys Tech on Jul 21 2011 12:00 AM
Questions: do the sending units and gauges have to match (ohms) or will they fit any gauge? reason i'm asking because i need both.
Question By: Anonymous on Dec 19 2010 12:00 AM
Yes, they should be a match. Please call us toll free. We can help. All our gauges and units match.
Answer By: Willys Tech on Dec 24 2010 12:00 AM