88gunmetalgta

iTrader: (1)

What type of fittings are these, and what fittings do I need to adapt them to -8 AN?

They are the factory hard lines from my '88 TPI car

anesthes

iTrader: (12)

Those are "Saginaw" fittings. I know the 3/8 and 5/16 saginaw is available to be adapted to a -6. Not sure about -8.


-- Joe

vetteoz

iTrader: (13)

TPI fittings are Metric "O" ring
16mm x 1.5 on the larger
14mm x 1.5 on the smaller

You need to find -8 AN to Metric Adapters ( if made ) the same as these -6AN fittings
EAR-9894DBHERL
EAR-9894DBJERL

Most run -6 AN braided because the hard lines are only that size

88gunmetalgta

iTrader: (1)

Thanks! Thats just what I needed to know.

Continuing down this dumb question path......

The attached image is how I plan to run my fuel lines. I really shouldn't NEED the loop at the rails, but I figure it will eliminate any chance of the "last" injector seeing a pressure drop.


Do the legs coming from the Y-block need to be the same length? I didn't think so.

I'd heard that its best to stick to one brand of fittings and hoses. Does this apply to ALL fittings (such as male AN-NPT adapters), or just hose and hose ends?


Also, I was thinking people went with -8 AN line on 3/8" tube cuz the ID of the tube is 3/8", whereas the ID of the -6 AN is not actually 3/8", but is instead the ID diameter that a 3/8" OD pipe would be. I will prolly still run -8, since eventually I plan to replace the lines to the tank eventually.

Orr89RocZ

iTrader: (20)

EFI car doesnt need bigger than -6 unless you are getting into huge hp numbers. 900-1000+ hp.

Keep it simple and run same brand line and fittings if possible. I dont know what regulator you plan to use but on all my previous setups, the regulator was mounted on return line after the rails. There was no supply line going into the regulator then to the rails.

I ran tank straight to fuel rails then out of the rail into the regulator then back to the tank.

The picture you have doesnt seem to make sense. Fuel has to go into the rails and out of the rails through the same line? How can you have reverse flow?

You can Y the supply line into the rails directly, and then on the return side, Y back into a single connection into the regulator then back to tank. Legs dont have to be same length.
Its just easier and cheaper to run in series with 1 line going into 1 rail, into a crossover to the other rail, then out to the regulator.

88gunmetalgta

iTrader: (1)

It would work, Fuel doesn't need to flow THROUGH the rails and back to the return. Anything before or after the regulator is at basically the same pressure, EXCEPT the line coming from the return port on the regulator.

That drawing was based off of the way some people run them. pic attached.
The problem (if you could call it that) with this method, is that there is the potential for the last injector on the second rail to lose a little fuel pressure.
that's why I added the loop, it would equalize the pressure a little better.

However, what you did just remind me of, is that the fuel would stay in the fuel rail loop until it is consumed. Potentially letting it sit on top of a nice and warm intake manifold for a while, and letting it warm up. Running them either of the ways you suggested would solve that problem.

I'll take your word that I only need -6 lines, take the cash I'll save by buying smaller lines, and invest in a second $40 Y-block. That's the way Aeromotive and all the rest recommend that they be plumbed anyway.

Once again I overlooked something by trying to figure this stuff out at 4:00 a.m.

vetteoz

iTrader: (13)

Save your $$$
450Hp+ on -6 lines with single supply to one rail and reg on end of other as Orr89RocZ suggests above

Orr89RocZ

iTrader: (20)

I got basically the same thing as above.... i'm up near 850hp but I have a -8 feed and -8 cross over but its overkill. feeding single rail and crossing over is fine for most builds

Orr89RocZ

iTrader: (20)

I thought that was the whole point of a return style system, to have fuel flow through and back to the tank, but I guess that could work...i just never seen it done that way

Jaxom

There's no sense in using Y-fittings to split the flow and then recombine it later. I've seen cars running 1000HP on monster turbos with a factory-style plumbing scheme (i.e. source->rail->crossover->other rail->regulator->return.)

There are a lot of cars on the road now using dead-head systems, like the "config 3" pic. The regulator can even be part of the fuel pump assembly, and there's only a single fuel line running from the tank to the engine. It feeds into the fuel rail, and the other end of the rail is a dead-end. It's common especially on Dodge products. Apparently fuel heating isn't considered to be a problem there, but I'd still stick to a return-style system in any performance build.

88gunmetalgta

iTrader: (1)

Well you guys are the experts -6 it is.

What do you think of this regulator?
http://www.summitracing.com/parts/AEI-13109/


With it set up that way, fuel rail is pumbed into the inlet on the reg, the outlet is plugged, and the return port is run to the tank, right?

Jaxom

Yar. You can T the supply line to the fuel rail and the regulator inlet, plug the outlet of the rail, and hook the regulator outlet to the return line. That'll let you put the regulator on the fender away from some of the engine heat too.

83 Crossfire TA

iTrader: (2)

I know that this is an old thread, but has anyone ever found these in black or -8?

88gunmetalgta

iTrader: (1)

They are available in black. Usually the color is just a suffix on the pn. I used fragola fittings FWIW.

-8 wouldn't do much good on a 3/8 line tho.

83 Crossfire TA

iTrader: (2)

Any idea what PN Frangola fittings you used, or how to change the earl's PN to a black one? I haven't had any luck finding either...

-8, depends on how you run it and how 90*s it has in it, but mostly it will make some plumbing that I want to do easier. But yea, it's not worth it (actually, 6/half dozen, the rails/fittings I bought from you already are setup for -6, but I think the rails are threaded for -8 or a larger npt thread).

83 Crossfire TA

iTrader: (2)

actually, _I think_ I figured it out... (though if I have it right the pics are all wrong on summit's site, and only figured it out with fragola fittings):

Fitting, Adapter, Straight, Aluminum, Black Anodized, -6 AN Male To 14mm x 1.5 O-ring Female Threads, Each
FRA-491970-BL

Fitting, Straight, Male -6 AN to 16mm x 1.5 Female O-Ring, Aluminum, Black Anodized, Each
FRA-491971-BL

Fitting, Straight, Male -8 AN to 14mm x 1.5 Female O-Ring, Aluminum, Black Anodized, Each
FRA-491982-BL

Fitting, Straight, Male -8 AN to 16mm x 1.5 Female O-Ring, Aluminum, Black Anodized, Each
FRA-491983-BL

88gunmetalgta

iTrader: (1)

Yup, those look like the right PN. Summit doesn't catalog the entire line, but they will still drop ship them. I didn't know the -8 ones existed, but the -6 ones look like the right part numbers per Fragola's catalog.

83 Crossfire TA

iTrader: (2)

the funny thing is that I tried earls and russel first (they're cheaper), but none of them came up with a black or clear finished PN, at least not in the searches (figured out what the PN was and how _I think_ to convert it to a black/clear part...)