Fuel won't flow backward through the FPR.  It's pushing on a tiny little area.  Hydraulics.

 

The bottom tube is for bypassed fuel keeping the pressure from getting too high, it's returned to the tank in a proper set up. Seems like we're discussing a very missed attempt to put an NLA dampener "looking" part on a high pressure fuel pump. The PO was going by looks instead of function. Had he searched he would have found an alternative.

I thought we were talking about the BRE car. 

 

43 minutes ago, siteunseen said:

The bottom tube is for bypassed fuel keeping the pressure from getting too high, it's returned to the tank in a proper set up. Seems like we're discussing a very missed attempt to put an NLA dampener "looking" part on a high pressure fuel pump. The PO was going by looks instead of function. Had he searched he would have found an alternative.

 

 

If that is what the device is, then the bypassed fuel would pour out the open port, onto the ground.

2 hours ago, Zed Head said:

Fuel won't flow backward through the FPR.  It's pushing on a tiny little area.  Hydraulics.

 

So the device on the BAT car is item 16 in this diagram, which would be mounted near the injector fuel rail, under the hood, not at the rear of the car downstream of the fuel pump.

In zspert's photo they could have used a straight 5/16" hose barb and saved some money. That FPR is not even a good stand in look-alike for the proper part. A '75-'77 FPR would have been a better con. 

Here is a pic off my 78 fuel dampener 

 

On 6/29/2023 at 6:23 PM, zspert said:

Now, what was he trying to address with this trick? 

Maybe just saving some money?  Didn't have spare hose or tubing?  Had a spare FPR laying around and needed to stop a fuel leak so he could sell it?

There was a thread in the past about alternatives.  They're out there but if you go to the Z specific web sites, that looks like a quick and dirty good idea.

https://zcardepot.com/products/fule-injection-pressure-pulse-damper-efi-280z-280zx

 

 

 

Here's a cheap alternative.

https://www.oreillyauto.com/detail/c/standard-ignition/fuel-delivery/fuel-injection/pressure-damper/3ef9efd721d3/standard-ignition-fuel-injection-pressure-damper/std0/fpd84?pos=23

Compare to others.

https://www.oreillyauto.com/shop/b/fuel-delivery/fuel-injection/pressure-damper/3ef9efd721d3

Interesting drama on BAT.  Arizona retitling.

https://bringatrailer.com/listing/1977-datsun-280z-98/#comments-anchor

4 hours ago, Zed Head said:

Interesting drama on BAT.  Arizona retitling.

https://bringatrailer.com/listing/1977-datsun-280z-98/#comments-anchor

Imagine having your z car stolen, and then seeing it on BaT a few months later!  What a story played out in the comments! And some people just kept bidding.

 

I had a motorcycle stolen years ago.  I eventually got it back when I saw it in the back of a guy's truck.  NOTHING ever happened to the thief as he claimed he bought from "some Mexican".

4 hours ago, Johnz1971 said:

I had a motorcycle stolen years ago.  I eventually got it back when I saw it in the back of a guy's truck.  NOTHING ever happened to the thief as he claimed he bought from "some Mexican

Most states have laws against possession of stolen goods. Sounds like they didn't want to mess with him.

9 hours ago, Zed Head said:

Interesting drama on BAT.  Arizona retitling.

Ewwwww. That all sounds messy. Hope anyone who was innocently caught up in that comes out OK. And I hope anyone not innocent is held accountable.