stm tank to rail kit

[BayState300GT]

Is the stm tank to rail kit worth it? My car is daily driven, 950cc injectors, gt35r, wiesco/ eagle, 272's. Also is it easy to install? Thanks.

 

[dsmcurse]

avoid 90* fittings, in the air brake world of semi trucks theyre illegal to use because they cut flow so much. look for 45* fittings

 

[99gst_racer]

avoid 90* fittings, in the air brake world of semi trucks theyre illegal to use because they cut flow so much. look for 45* fittings

This is a complete non-issue. At the volume and pressure that our fuel systems operate, it's nowhere near the region of which directional flow experiences a measurable loss.

On a -6 hose with the flowrate of ten Wally 255 pumps, you'd only see a 7 psi pressure increase from a 90* AN fitting. And nobody is running 10 Wally pumps, let alone on one -6 hose. With two Bosch 044 pumps ran in parallel through a single -6 hose, there is zero restriction through a 90* hose end.

 

[GSLENK]

Holy shit balls, that fitting is expensive.
However its's cheaper then having an AN fitting welded to my sending unit.

HAHAHA yeah that what I thought. But its very clean, and stainless steel, should last forever. (it is going in the engine bay for now, I'm running SS braid off of the oem hardline for now, relocating the fuel filter for a wire tuck.

Theres a cheaper option that I found too, and appears to be a perfectly functional solution, however uglier.

4g61t.org • View topic - Fuel Line Fittings, OEM to 6AN
from this thread I found:

4g61t.org • View topic - Fuel fitting from the hard fuel line

sourced here but it might cost more than the guy is asking.

pegasus racing:
https://www.pegasusautoracing.com/productdetails.asp?RecID=7549

IMO its the only way. Weld on or go this route. besides, if you stay -6an, I see no reason to weld, unless its free.

 

[Calan]

Can we get some pictures or a how to on installing an AN fitting in the fuel sending unit?

I dont see the point of the kit if it attaches to the stock line as that will be the restriction point. It would make alot more sense if the lines started at the sending unit for max flow... not knocking the STM kit in any way though, I plan on getting one myself

You could always just getter a better sending unit.

 

[99gst_racer]

besides, if you stay -6an, I see no reason to weld, unless its free.

The primary benefit to welding a bung vs using this fitting is being able to ditch the hardline that is prone to bending, kinking, and breaking.

 

[dsmcurse]

Well, at any rate, a 45 will flow more than a 90 so...

 

[Calan]

Well, at any rate, a 45 will flow more than a 90 so...

Why is that?

 

[kchaazz]

Ive been kicking around the thought of replicating the factory hardline from the front to rear of the car with -6 or -8 ss tubing, as I have tons of it at work. We carry the SS covered hose and fittings as well, but I could do the tubing cheaper and itd be pretty nice, really...

 

[99gst_racer]

Well, at any rate, a 45 will flow more than a 90 so...

If they are of the same inside diameter and restriction (zero), then how can one outflow the other?

 

[Calan]

If they are of the same inside diameter and restriction (zero), then how can one outflow the other?

Fluid gains velocity through the 45* bend due to the Heisenberg lepidoptera effect, so there is more room for more fluid to fill in behind it.

You should know that Paul!

 

[dexterholland04]

Fluid gains velocity through the 45* bend due to the Heisenberg lepidoptera effect, so there is more room for more fluid to fill in behind it.

You should know that Paul!

Yep...basic Fluid Dynamics.

 

[99gst_racer]

...

 

[black97spyder]

You could always just getter a better sending unit.

I plan on a STM full blown hanger eventually but if there is a way to do it with the stock hanger I would do that way for now, being the cost of a full blown hanger....

and im not sure how to wire the fuel gauge sending unit to work with the full blown hanger so my gas gauge and low gas light still works

 

[Calan]

I plan on a STM full blown hanger eventually

(You should browse the freelancer section and click signatures every now and then. )

 

[rvaughn]

If only there were a freelancer who produced a dual hanger for the 2g awd... Assuming they could make it fit of course...

 

[black97spyder]

(You should browse the freelancer section and click signatures every now and then. )

Where about should I look Calan?

 

[rvaughn]

^insert your own level sarcasm as you see fit 2g guys jealous of a 1g product for once!

 

[dsmcurse]

Why is that?

Because you can rail 90* corners in your car WAY harder than you can a 45 huh?

Look up the DOT guidelines to airbrakes on big trucks (yes i know its air not fluid) 90* fittings are not allowed because they rob to much flow.

I rigged off shore ocean boats at THUNDER JET BOATS for about 6 years, the big diesel ocean goin boats have a water to water radiator system, the hot engine coolant is cooled by fresh river/ocean water, the cooling system CAN NOT HAVE A 90* FITTING IN THE SYSTEM! the engine runs a little bit hotter than it should.

As the main rigger for Thunder Jet i got to do side by side water testing with an official YANMAR tech that was sent from there main head quarters, I first hand witnessed the differance in water moving from from a pair of 90's to the 45* fittings.

hmmm....

 

[DSM Jeff]

Ive been kicking around the thought of replicating the factory hardline from the front to rear of the car with -6 or -8 ss tubing, as I have tons of it at work. We carry the SS covered hose and fittings as well, but I could do the tubing cheaper and itd be pretty nice, really...

I had ClassicTube do this for me in -6 stainless along with my brake lines. I would say go for it.

I would also raise caution to those using a rubber hose in the tank. Be sure its fully fuel rated. I have replaced some for friends after they lost pressure due to the hose breaking down.

A little over done maybe but this is my Sending unit set up

 

[dsmcurse]

good job, pictures look good man^^

 

[99gst_racer]

Look up the DOT guidelines to airbrakes on big trucks (yes i know its air not fluid) 90* fittings are not allowed because they rob to much flow.

I rigged off shore ocean boats at THUNDER JET BOATS for about 6 years, the big diesel ocean goin boats have a water to water radiator system, the hot engine coolant is cooled by fresh river/ocean water, the cooling system CAN NOT HAVE A 90* FITTING IN THE SYSTEM! the engine runs a little bit hotter than it should.

As the main rigger for Thunder Jet i got to do side by side water testing with an official YANMAR tech that was sent from there main head quarters, I first hand witnessed the differance in water moving from from a pair of 90's to the 45* fittings.

hmmm....

Do you ever question things? Do you ever wonder why something is the way that it is? Did you ask how a 90* fitting in a cooling system can cause an engine to run hotter? Or do you just believe everything that you're told? I'm not fluid dynamics professor, not do I play one on TV, but the things you believe to be true sound absurd to the point where YOU should be questioning them.

I just checked the 2007 DOT air brake manual and there is nothing in it in regards to NOT using 90* air pressure transfer fittings. But it does mention several times about the use of "T" fittings, which we all know has a 90* directional change. Furthermore, there are dozens of online websites that sell DOT approved 90* fittings for the specific use of air brake tube.

And what exactly is "rob too much flow"? What exactly does that mean? Does fluid physically dissipate from the line when it reaches a 90* fittings?
________________________________________________________________

Fortunately for us, this thread is about fuel transfer on a car. Not air brakes, not offshore boats... And I'm not regurgitating misinformation told to me by a co-worker that I took to heart. At the flow rates that we DSMers flow in our fuel systems and through the sizes of the plumbing that we use, we will not experience any restriction (or robbery as you so eloquently put it) due to using a 90* fitting. Period. And aside from any potential restriction, there is no other possible side affect an AN fitting can have to fluid transfer on our fuel systems.

So regardless of what anyone tells you about air plumbing on a trailer, or cooling systems on a boat, I can assure you that this is a non-issue with a DSM fuel system. And to tell anyone that there is something to gain by switching 90* fittings for straights and 45's, well that's just misinformation.

 

[Calan]

Because you can rail 90* corners in your car WAY harder than you can a 45 huh?

That makes absolutely no sense whatsoever.

Are you really comparing lateral g-forces as related to cornering (grip and aerodynamics)... to fluid flow in a pipe?

 

[Calan]

If only there were a freelancer who produced a dual hanger for the 2g awd... Assuming they could make it fit of course...

^insert your own level sarcasm as you see fit 2g guys jealous of a 1g product for once!

Ok, he changed his car damn it. I KNOW he had a 1g when I first looked at his profile.!

(the 2g hanger is still on the radar... just a ways out)

 

[black97spyder]

(the 2g hanger is still on the radar... just a ways out)

More info on this??...

STM has a full blown hanger for 2g awd's but its pricey

 

[boost97gst]

This is how myths are created and propagated on the interwebs. Even though it may seem silly to get fired up over something so trivial, i agree w paul. The record HAS to be set straight by someone lest it be seen as the "truth".

edited out


Times like these i love 'tuners, great place

Ok, he changed his car damn it. I KNOW he had a 1g when I first looked at his profile.!

(the 2g hanger is still on the radar... just a ways out)

I was laughin so damn hard.... hahaha, shame it wasnt a 1g right? Still that was hilarious