Gas tank, Repair or Replace?

Restoration

  1. Dsertdog

    Dsertdog Active Member

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    As some you have read on Polaras project thread, I'm having a problem with dirty gas.
    The tank needs be removed and cleaned or replaced.
    In addition to the old gas, the stock tank has a soft ball sized dent on the driver's side.
    The sender seems to work fine.
    A new tank is about 4 bills with freight. I figured a new float and sock along with gaskets and a tank to trunk gasket too.
    Thoughts? Opinions?
    Thanks
     
  2. GJS

    GJS Senior Member FCBO Gold Member

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    400? I don’t think I paid that much all together but maybe.

    Honestly, I went the clean out route and it just didn’t work out. I’d suggest just replacing it.

    Just make sure you use the stock lock ring. The new ones are chintzy and don’t lock well. Mine jumped out .... aaaand that was the 5th and last time I intend to drop my gas tank for some time.
     
  3. twostick

    twostick Senior Member

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  4. BLUPORT

    BLUPORT Carpe Diem Cras FCBO Gold Member

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    If it's not rusted, just flush it, and put in the new float and sock. While you have the tank off, backflush the line from the carb with some good solvent, and put a new filter on.


    Unless money isn't an important part of the equation, in which case, just buy a new one.
     
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  5. GJS

    GJS Senior Member FCBO Gold Member

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    This is also true if it's not corroded I was just assuming it was.
     
  6. 73Coupe

    73Coupe Senior Member

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    My rule of thumb when it comes to gas tanks is: if they make a new one, replace it. This was told to me by a radiator shop owner 30 years ago.

    On these tanks with vent lines, the lines often become plugged solid with rust and can't be cleaned out, plus if you introduce sealer to the inside, then they will surely be plugged.
     
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  7. Davea Lux

    Davea Lux Senior Member FCBO Gold Member

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    It depends on what you mean by dirty fuel. If you are clogging fuel filters with rust, the tank needs to be replaced. What usually happens is that a car is left with moonshine blend fuel in the tank for a period of time and the fuel breaks down to form a corrosive by product that eats up all the plating on the inside of the tank. Once a tank starts to rust, there is no good fix, it will continue to rust. You can pull the tank and remove the sending unit and check the inside of the tank for rust. If it is rusty, it belongs on the junk pile and do not give it a second thought.

    Dave
     
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  8. Dsertdog

    Dsertdog Active Member

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    Picture's worth a thousand words right? This is filter number 3 or 4 within the last month. 000_0009.JPG
     
    Last edited: Apr 3, 2019
  9. CBODY67

    CBODY67 Senior Member

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    Prices vary on C-body fuel tanks. Although they all probably come from the same factory. So DO shop, but Van's is typically the most cost effective to purchase. Not sure if the new sending units are the correct ohmage? Cleaning the old one might be a better option. Which could also ensure it matches what the fuel gauge on the instrument panel needs.

    CBODY67
     
  10. Dsertdog

    Dsertdog Active Member

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    Does it matter if the tank comes vented or non-vented? Some sources sell an non vented tank for 66, Van's shows vents, probably why it works on a 67 and up C body. I can plug the vents.
     
  11. swisherred

    swisherred Well-Known Member

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    It looks like rust scale...I would attempt to wash it out with metal prep...that should remove most if not all the rust...and agree with back flushing the lines.
     
  12. 3C's & a D?

    3C's & a D? Well-Known Member

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    I always try saving them, for the sake of originality and cost savings. My '70 Newport convertible was sitting for twenty years (with a few yearly firings and the odd jerry can thrown in). It's fuel looked just like yours. I didn't remove the tank just the sender, sucked out all I could, back flushed the line, replaced old sender, new filter (clear one), filled 1/4 tank. Drive with sloshing in mind, lots of hard starts, stops and corners, hit some train tracks for good measure, inspect and replace filter when needed. Keep filling quarter tank at a time. I went through about three filters in 300 miles. Once it was running clear for a few hundred more miles, I replaced the sender, all hoses, pump and filter (steel one). That was 5-6 thousand miles ago. Every scenario is different. It worked for me, but it could have been an exercise in futility. I usually do things the hard way though, family trait. Should have mentioned, when I replaced the steel filter 3000 miles later there wasn't any signs of rust!
     
  13. Dsertdog

    Dsertdog Active Member

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    So far Vans was the cheapest. An exact non vented tank is more, but I can plug the vents. Car isn't totally numbers matching and I'm a stickler for reliability.
     
  14. CBODY67

    CBODY67 Senior Member

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    When swapping or removing the tank, be SURE to remember that the clamp which goes from the body fuel line and the sending unit grounds the sender. Clamp with a bar between the clamps which touches the body fuel line and the sender output tube. Normal Chrysler stuff from back then, I suspect.

    The 4-tube version is for the evap emissions control system. 2-tube would be the normal version with the vent pipe which goes high onto the rear frame rea. No-tubes would need a vented gas cap, I suspect.

    Just some thoughts,
    CBODY67
     
  15. LeBaron1973

    LeBaron1973 Senior Member FCBO Gold Member

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    It'd be far less hassle to just get the correct tank than stuff around blocking vents, spend the time thus saved repairing some other component.

    Happy motoring when you're done.
     
  16. Ripinator

    Ripinator Senior Member

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    My '66 Chrysler convertible has a gas tank with two vents (I think), so your car probably has a vented tank too. DO NOT PLUG THE VENTS.
     
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  17. GJS

    GJS Senior Member FCBO Gold Member

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    Have you pulled the tank yet? I'd be surprised if you didn't have a 2 vent unit.
    I'd drop the tank, get a direct replacement and a new sending unit and flush your lines really well ... esp seeing that fuel filter.

    As I stated before, don't use the lock ring in the sender unit kit, it's crap.
     
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  18. LocuMob

    LocuMob Fluid Technician with a hat FCBO Gold Member

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    There's two vents on the tank, so the vents are correct.
     
  19. Dsertdog

    Dsertdog Active Member

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    After discussing it with my lady, she agrees that a rusted tank is unreliable and a dented tank is undesirable. Unreliable +undesirable=unuseable.
    So I'll be ordering a tank and hardware from Vans this week.
    Thanks to all who responded.
     
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  20. 1978 NYB

    1978 NYB Warfighter FCBO Gold Member

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