AFPR setup
I picked up a M-Tuned fuel rail with K-Tuned AFPR off Facebook a few months back and after doing some research I was wondering if you guys could help me figure this one out.
When I got the stuff in the mail the AFPR had fittings on both sides with hoses attached to them and a fitting on the bottom with a hose. It also came with this T fitting. https://cimg7.ibsrv.net/gimg/www.mia...af947c813.jpeg https://cimg9.ibsrv.net/gimg/www.mia...0ba2328b3.jpeg https://cimg6.ibsrv.net/gimg/www.mia...310cff7b0.jpeg After some research it seems the way to install the AFPR would be to run one return line from the rail to the AFPR and then plumb it into the stock return line next to intake manifold. So HOW did this guy have this thing set up?! Any ideas how this would have been plumbed? |
Most likely, he was using the T to make it a dual feed rail.
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Originally Posted by curly
(Post 1591782)
Most likely, he was using the T to make it a dual feed rail.
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One side is feed to the fpr, the lower port is return to the tank, the other side is feed to the T, which T’s to both sides of the rail.
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Originally Posted by curly
(Post 1591813)
One side is feed to the fpr, the lower port is return to the tank, the other side is feed to the T, which T’s to both sides of the rail.
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C’mon Curly, draw a picture.
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Originally Posted by DNMakinson
(Post 1591871)
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I’m making no recommendations. I’m only showing what I understand Curly is trying to convey to you. That answers your question as to what the Tee was for; and why there were 3 hoses connected to the AFPR.
It it is up to you to decide why you bought this and how you wish to use it. I presume it was to be able to run higher fuel pressures. See this Here it is recommend to use a damper by drilling out that middle boss and mounting it there, if 99 or up. Possibly for all that are dual fed? IDK. Maybe best to get a recommendation from the company. DNM |
DNM thanks for your input. Initially I only bought this setup for the injectors which I have since sold in favor of some brand new DW 700cc injectors. I will not need this AFPR unless I one day decide to upgrade my entire drivetrain in search of 400+whp on E85. For now the rail and the injectors should get me where I want to be for some time.
Right around the time when you posted this I saw somewhere else a diagram of someone running the AFPR this way. That doesn’t really make sense to me to put the AFPR in the feed line, but it is apparently one way to set it up. Weird. One more question. I am running a standalone ECU and considering upgrading my fuel pump to Walbro 255 I’ve read reports of this pump overloading the stock FPR causing a rich condition at idle. Is this a condition that is consistent and therefore would be easily managed with a standalone, or is this something that is sporadic and unpredictable in which case I would remove the stock FPR and install this one |
If you think about it, this is how the factory does it.
The FRP is mounted to the fuel rail, which is a metal extension of the feed line. It holds until the set 43.5psi, dumping excess in the return line. This setup simply moves the aftermarket FPR off the rail with a rubber hose. I've tuned cars with the 255 for a decent idle without issue, but I don't like it. An AFPR adds a lot of hoses and complication in the engine bay, so if it isn't absolutely necessary, I wouldn't use it. The best thing the AFPR can do is give you the ability to go from 3 bar to 4 bar, increasing headroom if your injectors are slightly undersized. |
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