Unique Fuel Rail

[jfa.series1]

In working through the refurb of a group of fuel rails I came across one with some unique properties.  I'm hoping @kats or anyone else with insight can help me identify the unit - is it possibly a JDM / Fairlady part?  The first pic is the unique rail with a typical '71-72 240Z rail behind it for comparison.  The second pic shows two unique properties: the supply and return nozzles are equal length versus offset, and the first mounting bracket is fixed - not on a pivoting insulator.  The third pic shows a small brace installed in reverse.  The fourth pic shows a wide mounting bracket versus a narrow one.  Any input would be much appreciated.  Thanks!

 

[S30Driver]

@Mark Maras  has much experience with the carb's & rails of the early cars, maybe he can shed some light ...

[Mark Maras]

 Interesting. I wish I could help but I'm in the dark too.

[240260280]

The very early fuel rail in the FSM is unusual. It even has rubber fuel hose interconnections like the early EFI rails.

It may be possible that your unique rail is from a different car model than HLS30 but with SU's and L engine.

@Mike B may know.

 

 

Edited September 26, 2019 by 240260280

[CanTechZ]

For reference here is a pic of the fuel rail from my 7/70 car.  It's similar to your '71-72 fuel rail but it has the wide mounting bracket like your "unique" one.  The wide mounting bracket on mine has a bent over tab at the top with a tapped hole. I have no idea what that tapped hole is for.

[240260280]

Here is a 1972 Cedric Fuel rail.  It has similarities and differences:

 

[240260280]

1971 Cedric Single Carb

[jfa.series1]

2 hours ago, CanTechZ said:

For reference here is a pic of the fuel rail from my 7/70 car.  It's similar to your '71-72 fuel rail but it has the wide mounting bracket like your "unique" one.  The wide mounting bracket on mine has a bent over tab at the top with a tapped hole. I have no idea what that tapped hole is for.

We share this rail design our our cars - it is the typical Series 1 style.  There are two notable differences from the '71-72 style: the right-angle tab on the next-to-last mounting tang that you mentioned and the step-down in the tubes.  Ours has a gentle slope down from the wide tang forward to the next tang.  The '71-72 has a distinctive step-down at the back end.  The unique rail I found has this same distinctive step-down suggesting to me it is also from the same years.

[jfa.series1]

@240260280 Keep on Hoovering, its out there somewhere.  I Googled some RHD Fairlady Z engine pics - the few that I found all had a rail with the pivoting first mounting tang and offset supply/return nozzles.

[kats]

Nice examples ! 

I will take a picture of my Fairlady 240ZG tomorrow, let’s see what the car have .

Kats

[jfa.series1]

I just spotted another unique aspect of this rail: the return nozzle opening is a "huge" 1/8th inch diameter unlike the pinhole opening in the typical 240Z or 260Z rail.  This suggests it was (1) feeding a much lower fuel pressure to the carbs or (2) an allowance for a much higher fuel pressure entering the rail - possibly from an electric fuel pump.