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Old 05-30-2016, 11:12 PM   #1
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Default NB Fuel damper conundrum

Hi folks...hoping someone can shine some light on my confusion:

I have a 1998 (1999 USA) NB being rebuilt for turbo. I splashed out on the FM fuel rail which is a nice bit of gear now I have it in hand.
My question relates to what I thought was supposed to be a damper on my stock fuel rail (being an NB) but looks like a FPR rather than a damper?
My unit in the picture below has a return coming out of it and a vacumn port?
Is this an NA fuel rail FPR?


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NB Fuel damper conundrum-80-img_0987_26aebdda8584b747197862e9aef53f5e0b833250.jpg   NB Fuel damper conundrum-80-img_0988_a65bae4d497e4089ac06f3813c7d901f6677f9fd.jpg  
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Old 05-30-2016, 11:49 PM   #2
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Originally Posted by Calmdown View Post
Apparently there is/May be a variant fuel rail for the 99-01? The fpr on the front has a part number of BP5B 795300-3730. It has a return line and a feed line parked up front near the throttle body. There's a few threads on here about it, but nothing definitive.

Under a Mazda parts search, it shows the 2001-2002 moats with a 13290c pulse damper in the front. Shows the same for all of them.

Now I'm really confused. Are mk2/2.5 fuel rails the same?

I've got a 99 coming in anyway, so does it need to be a mk1 1.8 fpr, or can I use a 1.6 as well?

Just asking because I'll be calling junkyards to see what they have .
OK so found this post...thats me with the variant FPR 795300-3730!
So my plan is to run the FM fuel rail, fuel line and filter arrangement as per this:


Given I have a FPR on the rail, can I assume I do not have one in tank? Secondly, I am going to run an aftermarket FPR as per the above so should I just get the 99+ damper BP4W20180 to mount to the rail, OR should I just plug the port on the fuel rail and not worry about a damper?
Its all very new to me, sorry.
TIA
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Old 05-31-2016, 12:40 AM   #3
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Euro NB1s had return-style systems. You'll need to verify this, but I believe your fuel system is basically an NA system.

Do not follow that FM schematic for the NA. Get a regulator adapter and use a 2-port FPR. Their setup basically converts it to a returnless system which is inferior.
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Old 05-31-2016, 02:39 AM   #4
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Originally Posted by Savington View Post
Euro NB1s had return-style systems. You'll need to verify this, but I believe your fuel system is basically an NA system.

Do not follow that FM schematic for the NA. Get a regulator adapter and use a 2-port FPR. Their setup basically converts it to a returnless system which is inferior.
Thanks. I chatted to my mechanic today and he advised me similarly. I will run with 2 lines, separate FPR and get my hands on a stock damper to install on the FM rail.
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