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1970 Javelin fuel tank size

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greenhue View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote greenhue Quote  Post ReplyReply Direct Link To This Post Topic: 1970 Javelin fuel tank size
    Posted: Oct/13/2021 at 9:21pm
I was wondering if any new tanks fit my 70 Javelin. It now has 16 gallon tank and at 10 MPG , I can drive only a few hours before refueling. Somebody got one from Chiefs auto parts but it only was listed for 1971 and up. Is there that much of a difference in the years or did Javelins stay the same throughout the years? Will an Ambassador tank fit? Anybody refit any other models onto their cars? No fuel cells, please.
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Heavy 488 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Heavy 488 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/13/2021 at 9:39pm
Big car tanks are side fill, not rear.
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Trader View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Oct/13/2021 at 9:40pm
Here is a very expensive 19 gallon tank:
I believe if you call Spectra, they will make a 22 gallon tank, example only:
Keep us informed on what you find out as most will be planning our tours via gas stations in the near future!
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Sonic Silver View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sonic Silver Quote  Post ReplyReply Direct Link To This Post Posted: Oct/13/2021 at 9:43pm
Originally posted by greenhue greenhue wrote:

I was wondering if any new tanks fit my 70 Javelin. It now has 16 gallon tank and at 10 MPG , I can drive only a few hours before refueling. Somebody got one from Chiefs auto parts but it only was listed for 1971 and up. Is there that much of a difference in the years or did Javelins stay the same throughout the years? Will an Ambassador tank fit? Anybody refit any other models onto their cars? No fuel cells, please.
Since it is a 70 model, it must be a California car if it has a 16 gallon tank. The other 49 states had 19 gallon tanks in 1970, and all were 16 in 1971.
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mmaher94087 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mmaher94087 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/13/2021 at 9:43pm
..and at 10 MPG .."  Hum, not stock?  My '70 was better than 23 MPG.
Mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sonic Silver Quote  Post ReplyReply Direct Link To This Post Posted: Oct/13/2021 at 9:51pm
Originally posted by mmaher94087 mmaher94087 wrote:

..and at 10 MPG .."  Hum, not stock?  My '70 was better than 23 MPG.
My 70 - 360 AMX was around 12-15 mpg city/hwy when it was stock. I have no idea what it gets now, as I run it hard and never check it. Of course it has a 3.54 gear which makes a big difference compared to a 2.87. 
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390amx1 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 390amx1 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/14/2021 at 6:10am
I'm with Sonic on this one.  My well tuned and well running 390 AMX with 5 speed and 3.15 rear end turns 1950 RPM at 70 MPH.  Speedo and all other gauges have been rebuilt and the installed speedo was GPS tested for accuracy.  On a round trip from Cleveland to St. Louis and almost all freeway it was 19 MPG for the trip.  With the 4 speed t-10 and 3.15 rear best average was 16 mpg. 
69 BBB 390 Tremec 5-speed AMX
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Red Devil View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red Devil Quote  Post ReplyReply Direct Link To This Post Posted: Oct/14/2021 at 11:09am
I have the Spectra AMC1 tank on my '74 Javelin and used the pickup, straps, etc. for a Concord, but changed the potentiometer strip in the pickup to the early one to work with the stock gauge.   Worked fine with later Javelin push-in filler neck.   Vent line needed to be routed to opposite side, so modified the new tank before putting any gas in it.   For a '70,  you'd need to solder/braze in the filler neck or maybe change to the later push-in filler neck (not sure it works??).   Good time to also modify the tank for an in-tank fuel pump if ever considering EFI.  The stock tank didn't give enough range for me either.

Hope this helps, RD.
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