Help with installing Fuel Pressure Regulator
 

Hello,

Im getting ready to install my new FPR, it came with no instructions heres a picture of one just like it to help me get my point across.

https://www.miataturbo.net/attachmen...ine=1394229260

heres a picture of a 1.8l oem fpr with my personal editing to point out what im getting to.

Alright so the inlet on the bottom of the regulator is were the fuel sending hose goes.

the one on the top right is were the hose goes from regulator to fuel rail via adapter flange.

there is another hose coming from the side of the oem fuel pressure regulator. were does that get plumbed too?

there is a vaccum line looking port on the top of the reg, and a port which im pretty sure the gauge goes in.

so what do i do?

let me express this in a graphic
Attachment 105382

how am i supposed to plumb this thing? please help

Sides are fuel in. Bottom is fuel return.

Vacuum line looking port.... well.... takes a vacuum line.

Why did you even buy it?

Because he likes cheap useless Ebay things that MIGHT not set his car ablaze.

I think the bottom is the inlet.

That would be weird. "Normally" in a reg like that there are two inlets and 1 outlet, and a gauge port which is also connected to the inlets. Outlet goes back to the tank, inlet(s) go to the fuel rail(s).

Well, now we know how you got to be a moderator :pitlab:

Bottom back to fuel tank (the return out of the rail). Side connect to the rail where the stock regulator used to be with the piece that is included. Looks like the aeromotive regulator.

^ This.

OP: You have a megasquirt, why the hell are you fooling around with a FPR? Just go buy proper injectors already. There is a set of Denso RX8 425cc injectors in the classifieds right now for $125, that'll get you started.

Zing! Props, yo.

its not made by ebay douche bag. my stock fpr is fucked up.and the hoses need be replaced, alot of things in my engine bay are over 20 years old and why not get one from Majesty they have great reviews and are better and cheaper than getting an oem one from mazda for 170$

Yeah.

That's ebay knockoff bullshit.


How did you fuck up your stock fpr? And why didnt you just post a wtb for a stock one? Someone would have give you one for $10.

The stock fpr is 200k miles old, its only sending 20psi, and twitching. The fuel lines are dried out and wearing away, the kit comes with new steel braided line and an fittings.
Does the stock one rise in pressure like a rising rate fpr?

Ebay AN fittings for fuel use? Brave man.

Does the stock fpr have a vacuum reference?

Even if so, it won't rise with boost because well... was your car turbo from factory?

Car is not turbo i am naturally aspirated,
Built motor headers ms pnp, and i have a vaccum gauge, do i need to keep that tapped in on my vaccum line constantly? That does not sound safe having fuel regulator attached to a vaccum line that goes to a gauge in my cab

What?

Yes, 1:1 with manifold pressure.

https://www.miataturbo.net/attachmen...1&d=1394261378

Attachment 105427

Does this help?

I earned my status the old fashioned way, pleasuring men in public restrooms, just like Leonardo DiCaprio. Look it up.

does anybody know if i splice the vaccum line that goes to my gauge, and manifold, and hook that up to the vaccum ine port on the regulator

You should probably retain the stock vacuum line location, in the back of the intake manifold.

Most likely, you'll want to listen to the others, both in their insults and line location advice. Side goes to the adapter plate/fuel rail, the other side goes to a gauge (if you want), and the bottom goes back to the tank, aka the hardline.

Was there any indication that your stock fuel pressure regulator was bad? I'm still really confused as to how an ebay unit with questionable fittings and lines is more reliable/easier than just spending $5 on high pressure fuel line.

Put your tools down and back away from the car, slowly.

^ Best advice in this whole thread.

But you can't take good advice, can you? I gave you a solid recommendation in the other thread that will take you down the path to glory:

1. Stop posting
2. Read "Maximum Boost"
3. ???
4. Profit

The money you paid for your dubious eBay FPR probably could have paid for the book. I know, you are a modern man and can't be bothered to do things like read or use punctuation properly. After all, reading and books are for fags, amirite? :facepalm:

Believe it or not I'm trying to help you here. If you keep posting threads like this and ignore the people who are trying to help you will find your stay here at MiataTurbo to be very short and highly frustrating. Put down the Rockstar, pull your pants up, step back from the keyboard and try reading a book.

I hate you guys with you quirky little insults and BS. But I realized that i don't need this fuel pressure regulator.

Im going to sell it, luckily i got all of the AN fittings mocked up and connected properly to the hose, I also forked out 20 bucks for an mazda miata fuel rail adapter, so im in this thing 100$

I will try and sell it on ebay as a mazda miata AFPR kit for Naturally aspirated engines with a stock ECU (trying to get more fuel)

If you're going to buy an Ebay fuel pressure regulator, do it right and get the $25 shipped directly from China one.

Not the one that you pay as much as you'd pay for a good used Aeromotive.

Do what i do.

https://www.miataturbo.net/attachmen...ine=1394303768

Ok. im not sure if you guys are realizing what i am pointing out here in my question.
BTW probably going to sell the kit as a ready to go kit for a guy with a stock miata or whatever because i have already fitted the hoses and cut them to length before hand.

But nevertheless,

The stock regulator has only two ports which the only two fuel hoses connect; the other port, is connected to the rail.
- with the adapter there is another hose involved.
So, this other hose is going to the rail. its connected to one side of the regulator this is an sending line,
the Fuel sending line that was already in the engine bay, hooked up to the top of the reg, (is this supposed to be on the other side of the reg?(an inlet as well?))

So the two inlets, one of the inlets is sending...
and the bottom port is the fuel return? Just take a second to think about that, is that the correct way.

And is the vaccum port constantly going to be connected to the manifold, or vaccum line going to the megasquirt? constantly? this is supposed to be for more or less fuel because of the ratio of pressure.

this is for purposes of sellling/helping my friend install it on a stock miata with some less mild mods

No not constantly, you connect and unconnected the vacuum line as you drive. Really quickly.

What in the hell?

I have to admit, I'm slightly impressed.

I never realized someone could make installing a FPR so hard.

:rofl:

Oh, I get it! Its like PWM for your FPR?

The NA8 even has the solenoid in the vac line already to make this happen. :idea: