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Shop Kaiser Willys

Steel Fuel (gas) Tank (5 hole style sending unit)
Fits 46-64 CJ-2A, 3A, 3B

Part # 640685

New Steel Fuel Tank

Highest quality reproduction steel fuel tank for your under the seat mounted tank. Exact replacement with proper filler neck spout and drilled for 5 hole fuel tank sending unit. Eliminates all the problems caused by a rusty fuel tank and saves your fuel system from drawing contaminates.

This tank accepts the 5 bolt style sending unit only.

Now has the original "A" stamping on the front panel for original restoration.

Helpful Guides and Illustrations:
Fuel Tank Exploded View

46-49 CJ-2A
49-53 CJ-3A
53-56 CJ-3B (with individual gagues)

Part # Price





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What is the height of the tank from the bottom to the sending unit I'm going to put and aftermarket sending unit for digital gauges and I need to know demensions?

Willys Jeep Parts Tech:
Please email and we can try to help you on that.

I bought this tank and your fuel line kit for a cj2a. Do you sell the bushing that connects the tank to the fuel line? The fuel line will not screw directly into the tank.

Willys Jeep Parts Tech:
Your original 1/4" fuel line screws right into the tank. Email and we can help you.

Will this fit my 53 jeep w38a1. I have a large filler neck with a 3 prong cap?

Willys Jeep Parts Tech:
A6330 is what you need.

My fuel tank measure L-24 1/2 O.D X W-18 3/4" O.D X H- 6 1/4" O.D The neck O.D. is 2 1/2 " It is a 5 bolt sending unit and the fuel lines is coming out of the bottom of the tank and the old tank has a -- oAc co. stamping on it. Is this the right tank for me it looks like it if your measurement are the same as mine. your item # 640685

Willys Jeep Parts Tech:
Send us some pics of your vehicle and we can ID it for you and help.

I have a 53 CJ3A with no bolts for the sending unit. What size bolt/screws are needed?

Willys Jeep Parts Tech:
See part number: B0305 Thanks!

In the description it says it fits a 1959 cj3b but in vehicles it fits it doesn’t say 1959. Will this work?

Willys Jeep Parts Tech:
It would fit no problem.

I see a few questions about this gas tank working in a M38, 1 answer says it will and a few say it won’t. I am okay with a gap around the filler, so will it work if I am okay with the gap?

Willys Jeep Parts Tech:
Yes, this will for for your M38

I have just acquired a 52 M38-A1. The fuel tank tgatbis in it has a small fuel neck. From what I have seen and the tank on this site shows a big neck. Am I correct. Not sure how to identify. I'm new to willys so all the help is appreciated

Willys Jeep Parts Tech:
Sounds like you dont have a proper tank. Please email pictures of your vehicle and of the tank and we can help.

Hello, i have a Willys 1952 CJ3 and I need new fuel tank with all the items. 1. are all the items from the exploded illustration included? Or do I have to order each one separately?2. How much does the steel-fuel-tank weigh?

Willys Jeep Parts Tech:
They are all sold separately. This tank weighs about 20 pounds. Thanks

I have a 1949 CJ3A. My question is about the (2) threaded fittings on the bottom of the tank. One fitting is for the draining of the tank, the other is connects to the fuel line. The fuel tank drain is a threaded plug.(no problem). The other, the fitting that connects to the fuel line is the question. I need to know about that fitting. It seems to be 24 TPI and have an internal flare. I don't want to strip the threads so I need to know some specifics. Thank you.

Willys Jeep Parts Tech:
When the factory painted those tanks, they had the fittings already in there. Clean up the paint on the threads and it should work out for you. If you need to discuss further, please give us a call.
Willys Jeep Parts Tech:
The larger fitting is a drain plug and the other takes your original 1/4" fuel line.

I have a 1955 Willys CJ-3B. I need a fuel tank with a slanted neck. What is the part number? The only ones I can find are straight neck.

Willys Jeep Parts Tech:
The tanks are all made on the correct angle. Please email some pictures of your vehicle and we can help out. Thanks!

Does the tank need, or do you recommend, any treatment/sealer before filling it with fuel for the first time.

Willys Jeep Parts Tech:
We always just make sure to use non ethanol fuel and that nothing has gotten into the tank during shipment

I tried sending this question last week to the public forum, but I haven’t heard anything back. I Purchased this tank and have installed it but no fuel is coming out of the fuel plug. Shouldn’t it be coming out or am I supposed to use the drain plug?

Willys Jeep Parts Tech:
There is a larger drain plug on the bottom and a port for your 1/4" original fuel line. I would just make sure your fuel line does not have a clog or pinch in it.

Mike, Thanks for the answer. However, I have the metal fuel line from an earlier purchase from Kaiser Willys, but don't want to tackle running it under the vehicle just yet. Doesn't my fuel hose need an adapter with a fluted nipple, like the fuel line? (There is nothing screwed in and no gas is even leaking out of the bottom?) Thanks, Eddie

Willys Jeep Parts Tech:
No, the steel 1/4" fuel line screws directly into the tank like original.

I've purchased this item, but don't know what size adapter I need to get the fuel out. (I'm using a rubber fuel line on my 47 CJ-2A.)

Willys Jeep Parts Tech:
They originally took a 1/4" fuel line. It will screw right into the tank like original. Thanks!

I bought replacement tank for 46 2-A .. had a friend install , fuel line works great but went to fill and drain plug wasn’t installed what part number or boot fits drain properly It seems to be a strange size ?

Willys Jeep Parts Tech:
They take the original drain plug size. I do believe it was originally a 1/4" pipe thread but will need to confirm.

Hello, can you please tell me how many liter of gasoline fits in this tank(capacity)! Thank you, José

Willys Jeep Parts Tech:
10-1/2 gallon capacity. Thanks

Do you make military version summer canvas top (Black) for 1956 CJ5? And if so, what top bows and bracing will be required for its installation? Thanks-

Willys Jeep Parts Tech:
Yes, we can do it. Please email what all your looking for and pictures of your vehicle and bows. We can go from there. Thanks!

why is the military version for my 1951 M38 so much higher price?

Willys Jeep Parts Tech:
649759 is the part number. They are a limited run tank but in stock.

Is this tank the large mouth filler neck or small?

Willys Jeep Parts Tech:
That really is more for military tanks. The CJ's used gas cap part number: 908593 or 640594 depending if you want black or chrome.

Hello i wanted to know the tanks weight?

Willys Jeep Parts Tech:
Approx 19 pounds.

what gas cap do i use on this gas tank #640685

Willys Jeep Parts Tech:
Here is a black cap option - #640594 and the chrome cap option - #908593. Either will work. Thanks

I need to plug the fuel line connector because I'm hooking up a rubber fuel line to where the original drain plug is now. What size and type of bolt do I need to plug the fuel line hole?

Willys Jeep Parts Tech:
It takes a 1/4" fuel line - so your local Napa should be able to cross a plug size.

Is the fuel neck welded to the tank?

Willys Jeep Parts Tech:
Yes, see images above of item. It is attached.

what will I need to hold it in

Willys Jeep Parts Tech:
A1472K is the hold down strap.

Is your tank pre coated inside the tank with a rust inhibitor paint.

Willys Jeep Parts Tech:
No none are, but its not necessary. Just use non-ethanol fuel and it wont rust.

Fuel Tank The capacity in Gallon is ? to a CJ3A

Willys Jeep Parts Tech:
This tank holds 10-1/2 gallons. Thanks

Hello,I know I missed up on gas tank you sent me that was wrong,I tried to use it . I need one for 1956 cj2a,,spout on angle in back of tank. Need price. Thanks Ron B.

Willys Jeep Parts Tech:
They didnt make a CJ-2A in 1956. Please call us toll free and we can help you ID the Willys Jeep you are working on.

I need this tank for my 48 CJ-2A, What fuel line kit will fit it?

Willys Jeep Parts Tech:

i have a 1951 m-38 and need a fuel tank will item #640685 be a suitable fit replacement for my fuel tank.or does item # 649759 the only direct fit item for my jeep.another question is why does the price jump well over 400 dollars for this item?

Willys Jeep Parts Tech:
The military ones are a lot more from the manufacture. The 640685 will work but you will have a gap around the quarter panel where it goes thru the body to fill up.

Is this tank already painted in black?

Willys Jeep Parts Tech:
We get them in from the manufacture both black and grey depending on the run.

How thick is the metal on these tanks?

Willys Jeep Parts Tech:
I don't have the gauge spec but they are to OEM thickness.

Just received a gas tank for 48 cj2a. My fuel line doesn't fit new tank. What is the size on new tank so I can find new fitting.

Willys Jeep Parts Tech:
You must have an unoriginal fuel line in your vehicle. These tanks take the original 1/4" fuel line.

Which fuel pickup / sending unit works with this tank.

Willys Jeep Parts Tech:

I just received my replacement Fuel Tank #640685 from your company for my 1947 CJ-2A Jeep. Prior to installing it should I apply a rubberized protectant or tar to the bottom of the tank? It sits under the front seat of the Jeep.

Willys Jeep Parts Tech:
Use part number: B10331 insulator kit.

I have a 46 Willys Jeep. Original tank dimensions are 25x19x8 deep. Which replacement gas tank is correct to purchase?

Willys Jeep Parts Tech:
If it is a 46 Jeep then it has to be a CJ-2A. Please call us toll free and we can ID your vehicle and get you the proper tank for sure.

What is the tank dimensions and fuel capacity. I have cavity dimensions in the rear of the jeep of 25 1/2 in. long side to side X 15 in. front to back and 10 In. high. I believe it is a 1950 CJ-3A Willys. What tank can I use to fit?

Willys Jeep Parts Tech:
This would be the proper tank and they originally mounted under the drivers seat. Please call us toll free. We can see what someone has done in your Willys.

I have a 1960 willys jeep. I have a fuel order smell.. i need a gas tank , with sending unit which one do I get from you all.. part number please. thank you

Willys Jeep Parts Tech:
640694 is the sending unit you need.

Would like a passenger tank but it is unclear in your description if you also have the passenger tank. Please advise and thank you in advance :)

WIlly Tech:
Sorry, nobody makes a passenger side tank for the Willys Jeep that is proper.

will sending unit come with tank and pick up tube

Willys Tech:
They are a bottom drain like original and the sending unit is part number: 640694.

I have a1948 Kaiser 4 dr. car do you guys have a fuel tank that fit a car?

Willys Tech:
If its a Kaiser passenger car you will have to fabricate that tank.

I have just ordered a replacement tank for my '47 Willys. I live in Las Vegas, which gets quite hot in the summer. Do you recommend insulation placed around the tank? Is such a product available?

Willys Tech:
B10331 is the part number you need.

What size fitting is the fuel line outlet on the bottom, i.e. 1/8 NTF, -4 AN, etc. In other words, what fitting do I need to attach a fuel line?

Willys Tech:
They take a 1/4 fuel line like original.

Shouldn't the tank have a vent if a vented gas cap isn't available?

Willys Tech:
They never had one on the tank originally. Part number: 640594 is vented.

hi there. i have a 1948 willys cj2A model jeep. i would like to get a fuel tank that would go under the body and not under the seat. what do you recommend?

Willys Tech:
There really is nothing that will fit under the body due to clearance. This is the way to go above.

i have a 1963 willys I need a fuel tank,. Which one is it? I don't know which version my jeep is could you let me know. thanks

Willys Tech:
Depends if you have a CJ-3B or a CJ-5. If you have a CJ-3B then this is the one if you have a CJ-5 its a 912008.

I have a 1946 CJ2A...wanting to extend the fuel capacity and add an under seat tank to the passenger side...will this tank work bu just swapping it around??...I understand about the fill neck location issue..just wondering about the contour of the tank...(and also will remove the storage area under this seat for that tank)...

Willys Tech:
If you willing to cut and redo the filler nect then I suppose it could work.

how do you get the tank out because I cant get it

Willys Tech:
You just need to remove the drivers side seat frame.

Have tank from you #640685. What gas cap # fits this tank. Thanks

Willys Tech:
908593 or 640594

I have a '42 willys jeep that has the large tank. I am fixing it up for fun with my grandsons but am not willing to spend nearly $500 dollars for the original size tank when I can get the smaller tank for less than $200.00. If I put a rubber filler hose on one of your smaller tanks and modify the side of the jeep for a filler cap will it be in the way of the seat? Thanks, Jim (have ordered items from you before)

Willys Tech:
It will take some modification to fit a CJ-2A/3A/3B tank in a MB. You will will need to get part number: 663505 as well.

Can you use a aftermarket sending unit on this tank?

Willys Tech:
Im sure you could. We sell the proper one part number: 640694

Do they make a locking cap for this tank?

Willys Tech:
No, locking caps are not available.

Do these tanks come painted? In the picture it looks like bare steel...

Willys Tech:
Yes, they are primered and painted.

My current tank looks rusty on the inside, but on the outside everything looks OK. Will I need to buy any other parts or accessories to install this tank?

Willys Tech:
You probably want a sending unit. But really if your tank is rusty on the inside you need a new tank.

I'm ordering this tank for my (47)cj-2a,Which as No Tank right now. It also as NO piping for the tank. (i.e. From the fill spot down) (What ever you call it?) How/what do i do to get that too ?

Willys Tech:
The fuel line set is part number: MS01200

The tank i just pulled out of my 53 CJ3B has 6 holes on the sending unit. Will this tank work in that jeep?

Willys Tech:
Yes this will be the one for you. In that year you should have a 5 hole.

Does the tank come with the plug and the fuel line connector?

Willys Tech:
Yes the plug will be in there and it is ready for your fuel line to screw into.

What is the dimensions of the Tank?

Willys Tech:
These are to exact original equipment measurments.

how many gallons of fuel does it hold?

Willys Tech:
I believe 10.5 just like original.

Is this tank already sealed inside?

Willys Tech:
These are pressure tested at the manufacter.

can you give me the dimentions of this tank please? my 48 2a has after market seats and I need to make sure i have the room. thank you

Willys Tech:
They are just like original. Approx: 25 x 18-3/4 x 8-1/4

I have a 1954 was there more than one model that year?

Willys Tech:
In 1954 There was only the CJ-3B if you had a civilian Jeep.

I need a gas tank for a 41 GPW. do you have them ?

Willys Tech:
You want to order part number: A1221 for your GPW.

will this tank fit my 1951 willys m38

Willys Tech:
No you want part number: 649759

Does the Fuel tank Stock Number 640685 comes with the fuel tank sending unit?

Willys Tech:
No the sending unit is separate.

My '52 is missing the fuel tank. Does this have everything I need, or do I need to order other parts with this tank?

Willys Tech:
This is for the tank only. We also have the sending unit gas cap strap grommet ect ect...

I HAVE 1951 CJ3A ,can you tow the jeep without disconnecting the drive lines?Whats the best way to tow?

Willys Tech:
I always recommend disconnecting if possible.

Is this a bottom fuel connection?

Willys Tech:
Yes it is a bottom fuel line pickup. Just like original.

what is the gal. compasity of this tank?

Willys Tech:
They are 10.5 gallons just like original.

will this fit a 1951 m38?

Willys Tech:
It is part number: 649759

I have a 46 Willy's Jeep but I'm not sure how to determine what model it is.

Willys Tech:
They are just machine screws and can be picked up anywhere locally, even a Home Depot or Lowe's will have them.

This tank looks like it will fit my m38 1954, will it???

Willys Tech:
No but the proper tank is part number: 649759
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