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datsun 1600 fuel tank lines,which one is which
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Author:  benjoeau02 [ Tue Feb 17, 2009 5:45 pm ]
Post subject:  datsun 1600 fuel tank lines,which one is which
iv got a datsun 1600 fuel tank ,
not shure which one of the pipes are what,,,breather or fuel line
8mm ?
or 6mm ?

please advise
thanks
Author:  Mad1600 [ Tue Feb 17, 2009 8:07 pm ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
6mm return, 8mm feed.

You might want to swap these if you are going EFI. Or even better replace the 6mm with 8mm
Author:  benjoeau02 [ Tue Feb 17, 2009 9:15 pm ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
Thanks for that .,
Next month or two I will be putting a l20 around 180hp
Will the 8mm line be good enough
Thank again
Author:  turbovan [ Wed Feb 18, 2009 8:40 am ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
Mad1600 wrote:
6mm return, 8mm feed.

You might want to swap these if you are going EFI. Or even better replace the 6mm with 8mm
wrong the 6mm is the feed, 8mm return

only the 6mm one picks up from the bottom of the tank, the other one is higher in the tank.

6mm will be fine for your l20b
Author:  SR20Datsun [ Thu Feb 21, 2013 9:41 am ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
Chris,
I assume for your twin scroll turbo fitment you are going to be changing this?
Author:  datzenmike [ Thu Feb 21, 2013 12:54 pm ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
turbovan wrote:
Mad1600 wrote:
6mm return, 8mm feed.

You might want to swap these if you are going EFI. Or even better replace the 6mm with 8mm
wrong the 6mm is the feed, 8mm return
Yup, 620 and 720 are that way also. Returns are always larger, less restriction.
Author:  adriansk [ Thu Feb 21, 2013 7:31 pm ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
turbovan wrote:
Mad1600 wrote:
6mm return, 8mm feed.

You might want to swap these if you are going EFI. Or even better replace the 6mm with 8mm
wrong the 6mm is the feed, 8mm return

only the 6mm one picks up from the bottom of the tank, the other one is higher in the tank.

6mm will be fine for your l20b
Yes, 6mm is the feed. My old l20 ran twin45's and made 186hp and the 6mm fuel line couldn't keep up with it on the race track, fuel pressure would drop off to 2psi at best. I leaned it out before i realised this. I just bronzed some 5/16 bundy tube into the tank that would pick up off the bottom, and ran the feed up the old return line.
Author:  hailest [ Thu Feb 21, 2013 7:39 pm ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
I just realised I have mine around the wrong way after reading this post. OOPS!

So will the 6mm feed be OK to feed the surge tank? Then onto the SR...

Cheers,

Trent
Author:  nick [ Thu Feb 21, 2013 8:35 pm ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
Not really but you could suck and see. The dyno will reveal any problems.
If your fuel rail return line goes to the surge tank you might be ok as the surge tank is then not relying solely on the main tank for fuel.
Best to try and replicate the same sized lines as the motor had in its original car for starters.
Modified engines will need more thought...
Author:  turbovan [ Sat Feb 23, 2013 3:38 pm ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
SR20Datsun wrote:
Chris,
I assume for your twin scroll turbo fitment you are going to be changing this?
No need to change it, you can flow quite a lot of fuel through an 8mm line, and a 6mm line pumping constantly is also enough to keep a surge tank filled.

Did 5 back to back full power runs on the dyno to test cooling and there was no issue with fuel.
Author:  hailest [ Sat Feb 23, 2013 5:05 pm ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
Interesting, will leave it for now and see how it goes :)

Thanks for the advise. The engine is stock for the time being...
Author:  butch510 [ Sat Feb 23, 2013 11:04 pm ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
Could you just run all 8mm?

Cheers,

Richard.
Author:  turbovan [ Sat Feb 23, 2013 11:39 pm ]
Post subject:  Re: datsun 1600 fuel tank lines,which one is which
Sure, but the pickup in the tank is 6mm so you would have to cut that out and weld in a larger one.
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