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  1. #1

    Default 1980 mustang fuel tank

    what makes the 1980 mustang gas tank different from other years? because i have a 1980 that is full of old gas(1996) and was wondering if other years would work if they were modded.

  2. #2
    FEP Power Member Flowpro's Avatar
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    Interesting, I did not know this. I was keeping a 79 gas tank as a spare for my 80 Cobra in case I needed one down the road. What makes them different?
    ** Kurt **

    Current:
    1980 Mustang Cobra

    Past:
    1966 Mustang Coupe (first car!)
    1971 Mustang Grande
    1979 Mustang Hatchback

  3. #3

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    thats what i am trying to figure out.

  4. #4
    FEP Power Member Flowpro's Avatar
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    Quote Originally Posted by CanyonGT View Post
    thats what i am trying to figure out.
    Sorry, misread your first post.

    I just went out and compared the spare gas tank(1979) to the one on my car(1980) and can't find any differences. Inlets are the same diameter, the lines out are the same (same spot also), both have the vapor line on top (can't actually see mine but there is a line going up there).

    So I went to Oreillys parts store online and compared the two. Both came up with part number F82A. Then I dug a little further and searched for an 81 gas tank, early 81's (pre 4/1/81) are the same as 79 and 80 but later ones have the fuel lines on top with the vapor return line. See pic below.

    http://www.oreillyauto.com/site/c/de...2539&ppt=C0025

    These were for Mustangs with factory 302's and 255's.

    So to answer your question, looks like you need one from 79 to early 81. Otherwise you would need to modify your fuel lines to route them to the top of the tank instead of the lower front passenger side.
    ** Kurt **

    Current:
    1980 Mustang Cobra

    Past:
    1966 Mustang Coupe (first car!)
    1971 Mustang Grande
    1979 Mustang Hatchback

  5. #5
    FEP Power Member STL79Coupe's Avatar
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    I thought they were the same from 79-82??
    Keith formerly STLPONDS
    '79 V8 coupe in the works!
    Build thread http://vb.foureyedpride.com/showthread.php?t=89153

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    FEP Power Member kj_80Cobra's Avatar
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    And the 79-80 gas tanks are not being remanufactured by anyone. If you have a good one, you better hang on to it. The older gas tanks are smaller than the 81-93 tanks, 12 gallons vs. 15 gallons. You can fit the newer style in a 79-80 car with some work. I just finished the job. You have to change the tank strap mounting points and I had to beat in the edge of the tank in a few places to get it to fit up into the space between the spare tire well and the frame rail. I used the newer tank straps too.

  7. #7

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    thanks this is good info. do you have any pics of where you had to change the strap mounting points?

  8. #8

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    I was about to say 81+ were bigger.

  9. #9
    FEP Power Member gr79's Avatar
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    Quote Originally Posted by CanyonGT View Post
    thanks this is good info. do you have any pics of where you had to change the strap mounting points?
    My 79 has the old style 'T' shaped strap end. Slides into the slotted strap connection on the under body, over the axle area.
    The bumper end of the straps are basically the same as the newer ones.
    The newer straps have bolt on provisions at both ends.
    It is the front most end that is different. Have not crossed the river to do the conversion yet.
    Gonna get a fuel tank repair shop to do it, since i have no plans to do any Smokey Y. or military aircraft style tank drops ever.

  10. #10
    FEP Power Member kj_80Cobra's Avatar
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    Added the later style tank strap mount on the passenger side and made a new mount for the driver's side. Had to move mounting bolt locations on the other side of the strap too.


  11. #11
    FEP Super Member TWR2003's Avatar
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    Quote Originally Posted by kj_80Cobra View Post
    And the 79-80 gas tanks are not being remanufactured by anyone.
    Not so:

    Spectra Premium is producing the F82A (12.5g/47L) tank for 79-81 Mustangs (before 4/81). Rockauto.com has it and Im sure any auto parts store could order it. They are not making the straps for it though so you need to reuse the originals.
    MF: Shoot pool Fast Eddie.
    EF: Im shootin' pool Fats. When I miss you can shoot.

  12. #12
    FEP Power Member kj_80Cobra's Avatar
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    I never found that in my searches. If you have good straps, then that is a better option than all the mods needed to fit the bigger tank even if you switch over to efi like I am doing.

  13. #13

    Default RockAuto Pricing

    Here is what the results from RockAuto show as pertaining to a 1980:

    FINELINE Part # FLF12B
    $98.79

    SPECTRA PREMIUM Part # F82A
    (Only 1 Remaining)
    - Stocked in outlying warehouse--shipping delayed up to 1 business day
    $184.79

    Check it out here:
    http://www.rockauto.com/catalog/x,ca...CTRA%2BPREMIUM
    ~Corey
    80 Cobra
    07 F150

  14. #14

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    awesome info guys thanks for the great info. my straps are good. so i will have to decide to go with new or used now.

  15. #15

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    Quote Originally Posted by kj_80Cobra View Post
    Added the later style tank strap mount on the passenger side and made a new mount for the driver's side. Had to move mounting bolt locations on the other side of the strap too.

    Thats what i wanted to do. I have never seen pics of how the factory hardware looks on a 79 and 80. I did what a member suggested and used carriage bolts in the rear. The 86 tank fits like crap in my 79 capri. The early spare tire well seems bigger.
    1979 capri, a mess, 86 efi

  16. #16
    FEP Power Member Blainer's Avatar
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    The 85+ tanks are different as well because of the dual exhaust
    1981 Tu-toned coupe, 3.3 inline six, auto, Clifford header dual exhaust(first car)...gone not forgotten
    1982 Red hatchback(fixed it with parts from first car) SOLD
    1993 White LX Notchback 5.0, Auto...Sold (got wrecked and fixed)Gone but not forgotten
    1983 Bittersweet Factory optioned 5.0, 5 Speed T-top Coupe....FOR SALE!!
    1980 Tu-tone Blue/White 3.3 Notchback(was fixing up but became a money pit)...SOLD IT
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  17. #17
    FEP Power Member kj_80Cobra's Avatar
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    Quote Originally Posted by mutantcapri1979 View Post
    The 86 tank fits like crap in my 79 capri. The early spare tire well seems bigger.
    The well is bigger, that's why the 79-80 tanks were smaller. I had to bash in the top edge of my brand new 84+ EFI tank to get it to fit right.

  18. #18
    FEP Senior Member SVO4PWR2's Avatar
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    I have a question for the people that used newer style tanks "electric fuel pump & sending units on top" in 79 - 80 cars.

    Does the 79 - 80 sending unit bolt in & does the gauge work properly.

    thanks -RICH-
    84 CAPRI RS FOR SALE
    i'm a car junkie - i love junkie cars

  19. #19
    FEP Senior Member cipher's Avatar
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    Quote Originally Posted by SVO4PWR2 View Post
    I have a question for the people that used newer style tanks "electric fuel pump & sending units on top" in 79 - 80 cars.

    Does the 79 - 80 sending unit bolt in & does the gauge work properly.

    thanks -RICH-
    No they sending unit don't work. To use a later efi tank you need a sending unit from a efi 83 to 86. CFI,turbo,and sefi cars all have the correct sending unit. I used a efi tank from a 89 gt car with a sending unit from a wrecked svo in my wifes 80 turbo rs.

    Mike J.
    80 Capri RS turbo(svo in capri clothing)
    86 SVO
    "Doh, Why do my actions have consequences?"

  20. #20

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    How bad did you have to beat in the EFI tank?
    1981 T-top coupe - FEP #28
    1990 GT - H/C/I
    2003 GT daily driver - bolt-ons 252hp/292tq rw

  21. #21
    FEP Power Member kj_80Cobra's Avatar
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    On the left side where the foam insulation tape is.


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