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Thread: Mark VIII Gas Tank w/Dual Pumps?

  1. #1
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    Mark VIII Gas Tank w/Dual Pumps?

    I know this has been thought of before, but I'm not aware of anyone (here at least) that has went through with it...

    I need more fuel to continue running E85 and would like to explore the dual in-tank pump option first....from what I can tell, it's doable with a T-Bird tank. David Neibert has it done on his car, and I'm sure a few others.

    I'm pondering using a late model Mark VIII tank (97/98)...it looks like they use the fuel pick-up bucket like some other late 90's, 2000's Ford cars. It also appears that the sending unit drops the pump / hanger assembly more "straight-down" than the T-bird setup. I'm wondering if this would facilitate arranging dual pumps more so than the T-bird tank. I'm aware there are minor differences in the exhaust path....I don't really care about that right now. There have been other members that have verified that it will bolt it in, so I think that is out of the way.

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    Also wondering what weight difference there would be between the Mark VIII steel tank and the 92+ T-Bird plastic tank...I doubt it's much - the plastic tank is pretty heavy. A few Google images came up with a factory, gasketed fuel pump access door too...might try to make that work in the process, if I go this way.

    I'll be replacing the fuel line fittings out of the hat, and I think I should be able to reuse the sending unit without issue this way.

    Anybody care to share their experience and/or research?
    Matt Haub
    Shootouts: '09 SS 1st | '10 Mod1 2nd | '11 Bracket 3rd | '12 Bracket 1st | 2013 | '14 Bracket 3rd | 2015 | '16 Bracket 1st & Mod2 2nd | 2017 |
    Black '89 5spd - 281K miles, MPx, E85, Alky-Inj RWHP: ? RWTQ: ? Best 1/4mi:12.521, MPH:107.23mph
    35th Anniversary Auto 46k miles | Red '93 Auto 186k miles
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  2. #2
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    ~Chris
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  3. #3
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    Also wondering if the dual-pump Cobra fuel hat assembly would fit....I'd probably want to redo it in AN fittings anyway though.

    There's also the materials compatibility thing though....not sure there...finding mixed results on materials compatibility charts. I'm not too concerned on that point....the stock fuel hat / tubing is plated steel.
    Matt Haub
    Shootouts: '09 SS 1st | '10 Mod1 2nd | '11 Bracket 3rd | '12 Bracket 1st | 2013 | '14 Bracket 3rd | 2015 | '16 Bracket 1st & Mod2 2nd | 2017 |
    Black '89 5spd - 281K miles, MPx, E85, Alky-Inj RWHP: ? RWTQ: ? Best 1/4mi:12.521, MPH:107.23mph
    35th Anniversary Auto 46k miles | Red '93 Auto 186k miles
    My Garage

  4. #4
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    I'm following because I need a fix for my leaking hat gasket (replaced twice: still leaks, so I think it is the tank). Is the Mark VIII tank essentially the same shape (driveshaft tunnel and exhaust channel)? If nearly the same, I'm hoping my exhaust would not need to be modified.
    Kurt K (e-mail)
    SCCoA Member #: 443
    '92 SC AOD -- 11.521s @ 116.748mph, 2.0 AR power
    . . . . . . . . . -- 13.547s @ 101.01 mph, only w/ bolt-ons
    '95 SC 5spd -- All Stock, except 17" Simmons wheels.
    '90 SC 35th Anny 5spd -- 3rd owner, 16k miles
    2 '89 XR7 5spd's -- on their way out, really!

  5. #5
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    Quote Originally Posted by Kurt K View Post
    I'm following because I need a fix for my leaking hat gasket (replaced twice: still leaks, so I think it is the tank). Is the Mark VIII tank essentially the same shape (driveshaft tunnel and exhaust channel)? If nearly the same, I'm hoping my exhaust would not need to be modified.
    Did you replace the ring too, Kurt? Also, I've had the solder joint break on one of the lines into the hat, causing a leak.

    Swapping a tank would be more fun though. From what I've read, 93-96 had a plastic tank - possibly identical to the Thunderbirds/Cougars....97/98 had the steel tank with (for sure) different sending unit / hat assembly.
    Matt Haub
    Shootouts: '09 SS 1st | '10 Mod1 2nd | '11 Bracket 3rd | '12 Bracket 1st | 2013 | '14 Bracket 3rd | 2015 | '16 Bracket 1st & Mod2 2nd | 2017 |
    Black '89 5spd - 281K miles, MPx, E85, Alky-Inj RWHP: ? RWTQ: ? Best 1/4mi:12.521, MPH:107.23mph
    35th Anniversary Auto 46k miles | Red '93 Auto 186k miles
    My Garage

  6. #6
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    Quote Originally Posted by Kurt K View Post
    I'm following because I need a fix for my leaking hat gasket (replaced twice: still leaks, so I think it is the tank). Is the Mark VIII tank essentially the same shape (driveshaft tunnel and exhaust channel)? If nearly the same, I'm hoping my exhaust would not need to be modified.
    Did you replace the metal ring at some point? The Dorman ring does not have the bends in it to put tension on the oring when it is locked down. I replaced mine with a stock ring and all is well. You could probably put the bends in the Dorman ring if you had to. I can try to get some pics.
    ~Chris
    SCCoA Member #1826
    Bettie Riding jack stands
    SCARlet on drag duty now

  7. #7
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    Quote Originally Posted by BLOWN38 View Post
    Did you replace the metal ring at some point? The Dorman ring does not have the bends in it to put tension on the oring when it is locked down. I replaced mine with a stock ring and all is well. You could probably put the bends in the Dorman ring if you had to. I can try to get some pics.
    Stock ring, new gasket (twice).
    Kurt K (e-mail)
    SCCoA Member #: 443
    '92 SC AOD -- 11.521s @ 116.748mph, 2.0 AR power
    . . . . . . . . . -- 13.547s @ 101.01 mph, only w/ bolt-ons
    '95 SC 5spd -- All Stock, except 17" Simmons wheels.
    '90 SC 35th Anny 5spd -- 3rd owner, 16k miles
    2 '89 XR7 5spd's -- on their way out, really!

  8. #8
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    Quote Originally Posted by BLOWN38 View Post
    Did you replace the metal ring at some point? The Dorman ring does not have the bends in it to put tension on the oring when it is locked down. I replaced mine with a stock ring and all is well. You could probably put the bends in the Dorman ring if you had to. I can try to get some pics.
    I think I remember having to add a little more bite on mine...it was probably a Dorman replacement
    Matt Haub
    Shootouts: '09 SS 1st | '10 Mod1 2nd | '11 Bracket 3rd | '12 Bracket 1st | 2013 | '14 Bracket 3rd | 2015 | '16 Bracket 1st & Mod2 2nd | 2017 |
    Black '89 5spd - 281K miles, MPx, E85, Alky-Inj RWHP: ? RWTQ: ? Best 1/4mi:12.521, MPH:107.23mph
    35th Anniversary Auto 46k miles | Red '93 Auto 186k miles
    My Garage

  9. #9
    Join Date
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    Paoli Indiana
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    Kurt I had a similar problem had to re/solder the return line to the hat it was only partially sealed.
    93 SC Red Auto 111k
    2013 Shootout Bracket ET First Place
    2015 Shootout Car Show Honerable Mention
    2016 Shootout Mod-1 First Place
    4.2, 2.3 Whipple, 3.73s AOD
    307rwhp 12.70@107.2 (MPX)
    395rwhp Whipple 11.741@117.5mph

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