Original gas sending unit size?

[swissmopar]

Which is the correct size of the original gas sending unit for a Superbird?
5/16 or 3/8

[nascarxx29]

I think its 3/8 inside the tank .But at the end it comes out through sender it drops to 5/16 where hose connects .Double check I havent changed a tank or sender in a while

[maxwellwedge]

3/8" sender and fuel line all the way to the pump.

[Aero426]

3/8" sender and fuel line all the way to the pump.

This is correct. 

[nascarxx29]

This I what was thinking of even though its a HP 3/8 fuel line required car .
At some area on the fuel line it was cut down to the smaller 5/16 line size.From Seperator to carb to  5/16 And found this older post saying the same?
http://www.dodgecharger.com/forum/index.php?topic=4414.0

Re: Fuel Line Question 5/16 to 3/8
« Reply #5 on: October 16, 2005, 04:49:24 AM » Quote 

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Originally on an HP big block car the main line from the tank to the pump is 3/8"....out ot the pump to the vapor seperator gets cut down to 5/16" as well to the carb.

The return line back to the tank from the seperator is 1/4" in diameter.....it runs parallel to the main line

[maxwellwedge]

Dave - It is a little confusing. In 1970, Chrysler finally came to their senses and put a 3/8" sender and a 3/8" fuel line to the pump on 440's. It is the 69 440's (and probably the 68's) that had the 3/8" sender and 5/16" fuel line to the pump....The Hemi's in 69-71 (not sure about 66-68) had 3/8" sender and 3/8" fuel line to the pump.

[nascarxx29]

  makes sense last car I had was the 69 daytona And superbirds mid 70-80-s

[pettybird]

3/8" sender and fuel line all the way to the pump.

I don't.  I have 5/16" to the carb from the pump.  This is on my 4bbl Petty bird with its original fuel lines.

[maxwellwedge]

3/8" sender and fuel line all the way to the pump.

I don't.  I have 5/16" to the carb from the pump.  This is on my 4bbl Petty bird with its original fuel lines.

Re-Body!!!!    Re-Body!!!!   

You should - You 100% sure?

[pettybird]

I'll check tomorrow but I'm 99% sure.

Hemis and six packs are probably different since they have the HD fuel pumps. 

[maxwellwedge]

Hey Doug - The 383 got the 5/16" - 440's (all) and Hemi got the 3/8" main and the return line in 70.

Have you been adding liquid to that jar again?     There is a miniscule difference beteen the two so it's not always the easist to spot....1/16".

[gtx6970]

AFAIK, All Superbirds should be 3/8" main line with a 1/4" return

It's the Daytona that I can't get 100% confirmation on , per normal 440 car build specs they should be 5/16" and Hemi only should be 3/8"

[maxwellwedge]

Hey Bill all 3 of mine (440 Daytona) are 3/8" sender - 5/16" main line.

[gtx6970]

Hey Bill all 3 of mine (440 Daytona) are 3/8" sender - 5/16" main line.

Jim, I know about the 3/8" sender with 5/16" line thing.
I just re-read my comment and I should have said line size . you were supposed to know what I meant not what I wrote.

But I had an ebay customer last year swear to me his original Govier authenticated   440 Daytona was 100% original and it had a 3/8" line and sender. it's the one and only pre 1970 440 car I 've ever heard of that was equipped as such

[maxwellwedge]

Well - Mistakes happened I guess....Also - consider the source....

[nascarxx29]

That short piece of fuel line where sender connects to main line.I can remember on alot of my prior cars changing it as it split or swelled .I thought it was 5/16

[RAC95054]

Don't forget, starting in 1970, the 440 and Hemi started using the 1/4" vapor line as well, so the sending unit had two connections.  I don't think it was California-specific.

[maxwellwedge]

I think it was 68 but close enough! 

[69fuchs]

AFAIK, All Superbirds should be 3/8" main line with a 1/4" return

It's the Daytona that I can't get 100% confirmation on , per normal 440 car build specs they should be 5/16" and Hemi only should be 3/8"

I am confused!!!

My 68 gtx 440 car had 3/8 line 1/4 return (original fuel lines/vapor separator still on car)  The only 5/16 on this car was pump to carb
My 69 charger rt 440 automatic  has 3/8 line 1/4 return (original lines/vapor separator) 42,823 miles on this car....my dad bought it new.
My 69 charger rt 440 4 speed has 3/8 line 1/4 return

The only 69 b body 440 cars I have EVER seen with 5/16" line are some of the a-12 cars.  Why do daytonas have 5/16"?

[tan top]

Don't forget, starting in 1970, the 440 and Hemi started using the 1/4" vapor line as well, so the sending unit had two connections.  I don't think it was California-specific.

69 440 & hemi cars had the 1/4 " return with a vapour separator also
don't think  68 s did though , i await to be corrected  

[gtx6970]

AFAIK, All Superbirds should be 3/8" main line with a 1/4" return

It's the Daytona that I can't get 100% confirmation on , per normal 440 car build specs they should be 5/16" and Hemi only should be 3/8"

I am confused!!!

My 68 gtx 440 car had 3/8 line 1/4 return (original fuel lines/vapor separator still on car)  The only 5/16 on this car was pump to carb
My 69 charger rt 440 automatic  has 3/8 line 1/4 return (original lines/vapor separator) 42,823 miles on this car....my dad bought it new.
My 69 charger rt 440 4 speed has 3/8 line 1/4 return

The only 69 b body 440 cars I have EVER seen with 5/16" line are some of the a-12 cars.  Why do daytonas have 5/16"?

See there, I've found just the opposite. every 1969 440 car I've had or had access to has been 5/16" main line with a 1/4" return line used with a 3/8" sender with a 1/4" return line fitting

I've never had a 1968 440 car so I can't go there.

[69fuchs]

AFAIK, All Superbirds should be 3/8" main line with a 1/4" return

It's the Daytona that I can't get 100% confirmation on , per normal 440 car build specs they should be 5/16" and Hemi only should be 3/8"

OK, I just went out and measured fuel lines on my cars:

1969 charger rt 440     5/16" fuel,  1/4 return.

1968 charger rt hemi      3/8" fuel, 1/4 return.

All this time I thought the 440 cars were 3/8, but I was wrong.   You taught me something new today.  Thanks Bill!!!

[nascarxx29]

  It would seem logical that the 440 six pack and 426 dual quad Hemi would need the larger line for more fuel volume.And they recieved a different fuel pump
 But A12 440 six pack car with 410 gears having 5/16 line  

[swissmopar]

Thanks for the help!!!
Karl

[gtx6970]

It would seem logical that the 440 six pack and 426 dual quad Hemi would need the larger line for more fuel volume.And they recieved a different fuel pump
 But A12 440 six pack car with 410 gears having 5/16 line  

A12 cars started life as simple 383 cars and were converted outside of the normal production line methods