Building my fuel rail

[DSMMER06]

Im going to go to mega squirt after i build my fuel rail and thats where im stuck at. how do you install a 1:1 fpr if you dont have a return line? also should i get an sfmu

 

[BigRand]

well its not that it can't be done, regulator goes on the feedline....but what I don't get is why don't you just install a return line if your building a fuel rail..

 

[Locke]

Since your '97 will have the late model fuel system., your return line will be under the vehicle, in front of the fuel tank, on the passenger side of the vehicle, off of the FPR.

 

[VelocitàPaola]

If you're going the MSnS-E route, you might as well re-do a portion of your fuel lines. Depending on your goals, you can completely redo them, but you can get away with connecting the stock feed lines, and running your own return line. For the return, you'll need 3/8" rubber line (made specifically for fuel injection systems).

You'll need to connect the output of your new rail to the input of the AFPR using rubber line. Now connect the output of the AFPR to the stock return line with more rubber hose.

Obviously, you'll have to remove the stock FPR/input-output junction. There are many ways to install a return line for use with an AFPR, but this way seems the most straightforward.

An S-FMU is a type of non-standard rising rate AFPR... for MS, you should only need a 1:1 AFPR.

 

[Ajax]

I had the same issue and ended up removing my stock fpr, and installed a -6AN line from my tank with a fitting that fit right onto my fuelpump out. Ran that line straight to my fuel rail and unscrewed the schrader valve used an AN fitting from there to my AFPR and from my AFPR to my stock fuel line on the fire wall. Removed the stock FPR by the tank and used some fuel hose from were the fpr use to be to the tank return. Works great for me sofar! only thing that is pissing me of is that I switched over to 1660cc and have been told the -6AN line will not hold up! So am guessing sometime in the future I might have to change that out if I want to use the full potential of my new injectors.

 

[XMasta19]

I had the same issue and ended up removing my stock fpr, and installed a -6AN line from my tank with a fitting that fit right onto my fuelpump out. Ran that line straight to my fuel rail and unscrewed the schrader valve used an AN fitting from there to my AFPR and from my AFPR to my stock fuel line on the fire wall. Removed the stock FPR by the tank and used some fuel hose from were the fpr use to be to the tank return. Works great for me sofar! only thing that is pissing me of is that I switched over to 1660cc and have been told the -6AN line will not hold up! So am guessing sometime in the future I might have to change that out if I want to use the full potential of my new injectors.

 

[Ajax]

YEah I know it's confusing and I have not heard of anyone else going that route but I could not find help so I just figured out my own way. If you are lost with cerrtain steps ask, bc its kinda confusing if you look at the whole picture but makes sense if you look at one thing at a time.

 

[Woot]

your running 1660cc injectors?

 

[DSMMER06]

would it just be easier to buy like an aem fuel rail so that its already tapped?

 

[BigRand]

have you ever seen an AEM fuel rail, made for our cars?

Making a custom one really isn't that hard, if you have the fuel rail stock, and know who to take it to if you don't know how to tap it yourself.


Or if your lucky, you can find a couple that are already made for the 420a (NOT OBX) but someone selling a custom made one, all you have to do is strengthen the welds that it came with.

 

[VelocitàPaola]

Yep. I got my fuel rail stock from Ross Machine. I'm going to stick it in the mill and drill the holes, then do the same for the manifold (for the secondaries). The ends get tapped for 10-AN ORBs. 1600s will go in the back, and stockers will be in the front.

Don't get AEM Universal Rails, they're so expensive... any extruded aluminum stock will do.

 

[BigRand]

Hey paul, what are the biggest sized injectors that MS can control?

 

[VelocitàPaola]

Uh... the answer to that question isn't very cut and dry. MS controls injectors by outputting a pulsewidth. Larger pulsewidths on smaller injectors correspond to smaller pulsewidths on larger injectors (injector size and pulsewidth share an inverse relationship).

Given that, MS can physically open and close just about any size injector (although, I've never seen any much bigger than 1600, and I can't imagine anyone needing much more than 1600).

The problems arise when MS tries to successfully idle with larger injectors. MS can only make pulsewidths so small, so when you have a really large injector, chances are you'll bottom out the idle pulsewidth and idle will be a little sloppy. Anything bigger than a 700 or 800 might feel a little sloppy at idle. Forget a "normal" idle with 1000s.

Staged injectors can help combat that problem though.

 

[Ajax]

But you could use the HiRes code for MS which helps. My injectors are supose to be 1600cc but I just got them reconditioned and they flow 1660cc.

 

[VelocitàPaola]

True, but then low Z injectors aren't simply plug-and-play anymore, as you'll have no flyback protection.

 

[XMasta19]

Holy triple post!!!

Why such huge injectors?!?

 

[Ajax]

E85-----requires more fuel.

 

[Blitzeclips]

Paul's drunk.

 

[VelocitàPaola]

The DSMTuners.com server was drunk... I gave up after it was "loading" for half an hour...