Fpr For Big Fuel Return Pipe?!?

[GreeceS13]

I have 1 intank walbro and 2 external walbro with surge tank and I want to use stock fuel feed and return both for feed... each pump one fuel rail side... and from cencer the return with fpr and 16mm fuel returm line... but fuel pressures are 8mm!! How I will use 16mm fuel line?

Also how I will make the fuel return pipe cheap and safe? Braided or Silicone are very expensive choices..? Black rubber or something other?

[GreeceS13]

Anyone?!?

[shanef]

i use aeromotive fuel regs - great bit of kit

also dont skimp, use proper fuel lines. braided all the way back or braided to an aly line under the car, then back to braid into the boot - i use earls fittings/lines

also, a -8 return line will be plenty big enough

[GreeceS13]

Ok -8AN have 5/8inch external diameter and 3/8inch internal diameter!

Can anyone tell me what is the stock fuel feed and return pipes please??

[GeeTR]

8mm ID comes to mind? Ill try and check this morning, and update this post.

[GreeceS13]

8mm internal???

-8AN pipes have 3/8inch internal... so only 9.2mm!!

So are you sure that -8AN pipes are enough? They are like stock...!!

Anyway if I will put only -8AN pipe I think that I can mount it at stock fpr right?

[shanef]

8mm internal???

-8AN pipes have 3/8inch internal... so only 9.2mm!!

So are you sure that -8AN pipes are enough? They are like stock...!!

Anyway if I will put only -8AN pipe I think that I can mount it at stock fpr right?

u said ur using the std feed and return lines both as the feeds. 1 line for each fuel pump and they join the fuel rail at each end. how do you propose to use the std fuel reg?

IMO if ur going to this much trouble, ur best off getting a dual entry fuel rail, an aftermarket fuel reg and dong the damn thing properly.

-8 line is 7/16 (11.12mm) ID

[GreeceS13]

http://cgi.ebay.com/ebaymotors/Stainless-S...sspagenameZWDVW

Dimension Table

AN-Size External Diameter of Stainless Steel Pipe

4 1/2inch 12.70mm

6 9/16inch 14.29mm

8 5/8inch 15.88mm

10 25/32inch 19.84mm

12 29/32inch 23.19mm

Dimension Table

AN-Size Internal Diameter of AN Fittings Adaptor

4 3/16inch 4.25mm

6 9/32inch 6.60mm

8 3/8inch 9.10mm

10 31/64inch 11.65mm

12 9/16inch 14.20mm

8AN is 5/8 external and 3/8 internal! 3/8 internal is only 9.1mm and the stock is 8mm!

Some other people here told me to do this.. two external pumps using stock feed and return both for feed and then a braided return 5/8! Stock pipes are 8mm! So 8+8=16mm feed and only 9.1mm return?!?

I will modify my stock fuel rail to make it dual entry and I think to put the stock fpr at the center of the rail as in the other thread we said with other people here!

I ask them if I can use stock fpr with two external pumps and the said YES!

The thread is here... http://www.skylinesaustralia.com/forums/S1...ct-t202358.html

But now I don't know what I need :|

[GeeTR]

I just measured 8.17mm OD of the stock steel fuel line. ~1mm wall thickness, the ID would be around 6'ish i would think.

The stock FPR prolly "would" functionally work fine, but once you've moded the rail, and bolted a hose tail to the reg, ppl are suggesting you might as well buy aftermarket items.

Considering in other of your threads, ppl mentioned that the stock lines would support 600rwhp, -8 return would be fine. In the total cost of things, playing around with returns is fairly trivial, and can modified later on, if proven to be insufficient. Swot i would do.

It will be a true win for social networking forums when this car is running, and youtube is full of videos of it

[shanef]

http://cgi.ebay.com/ebaymotors/Stainless-S...sspagenameZWDVW

Dimension Table

AN-Size External Diameter of Stainless Steel Pipe

4 1/2inch 12.70mm

6 9/16inch 14.29mm

8 5/8inch 15.88mm

10 25/32inch 19.84mm

12 29/32inch 23.19mm

Dimension Table

AN-Size Internal Diameter of AN Fittings Adaptor

4 3/16inch 4.25mm

6 9/32inch 6.60mm

8 3/8inch 9.10mm

10 31/64inch 11.65mm

12 9/16inch 14.20mm

8AN is 5/8 external and 3/8 internal! 3/8 internal is only 9.1mm and the stock is 8mm!

Some other people here told me to do this.. two external pumps using stock feed and return both for feed and then a braided return 5/8! Stock pipes are 8mm! So 8+8=16mm feed and only 9.1mm return?!?

I will modify my stock fuel rail to make it dual entry and I think to put the stock fpr at the center of the rail as in the other thread we said with other people here!

I ask them if I can use stock fpr with two external pumps and the said YES!

The thread is here... http://www.skylinesaustralia.com/forums/S1...ct-t202358.html

But now I don't know what I need :|

farken jeebus. look at the earls/speedflow specs, not some random specs on f**king google.

braided hose specs - http://www.mscn.com.au/scripts/prodView.asp?idproduct=17

aly tube specs - http://www.mscn.com.au/scripts/prodView.asp?idproduct=95

modding the std fuel rail will only be the better option if u can get it modded for under $300, and a fuel reg only costs ~$160 ( http://store.summitracing.com/partdetail.a...mp;autoview=sku )

[GreeceS13]

The Aeromotive fuel reg that you show me has 6AN inlet and 6AN return...

So how I will put 8AN pipes?

Also I cannot find any fuel reg with 8AN inlet and return in fair prices... all are very very expensive...

[R31Nismoid]

Performance costs money... we've told you this a number of times

[tacker]

why a dash 8 return line, i believe the centre outlet of a after market fuel rail is no where near that size nor the FPR ports your throwing your money away.

still i made new supply and returns out of aluminium tube ( 10mm od ) and welded dash 6 male fittings to each end and used braided hose to connect to them.

cost was 28$ for the 4 male fittings and 9$ for the 2 lengths of alloy tube 10$ to weld the fittings on to tube.

[DCIEVE]

If I was you I would replicate the standard feed and return lines in ally tube (this is the only cheap part), solder -8 fittings either end, split the feed to twin -6 for a twin feed rail and return from the middle of the rail to a good reg ie aeromotive and back through the -8 line.

http://www.aeromotiveinc.com/products.php?...b=1∏=11

I cant see reusing the stock lines as twin feeds as being economical, the lines willneed to be removed from the car anyway to silver solder the fittings either end (not to mention four off instead of two), would be much easier to just copy in larger id ally and halve the no. of fittings.

btw do it in teflon braid... and yes the jap rails come with -6 fittings, just replace the centre return with -8

Edited March 11, 2008 by DCIEVE

[datsqik]

-8 fuel line and fittings to the rail is good for 500-800hp and -10 is good for 800-1100hp and the return from the reg can be one size smaller than the supply. Aeromotive make a reg with 4x -8 inlets and a -8 outlet.

[shanef]

The Aeromotive fuel reg that you show me has 6AN inlet and 6AN return...

So how I will put 8AN pipes?

Also I cannot find any fuel reg with 8AN inlet and return in fair prices... all are very very expensive...

simple, get -8 adapters to screw into the reg

[DCIEVE]

simple, get -8 adapters to screw into the reg

be far easier to just get a1000 instead of the a1000 -6

in any case you need to buy the fittings you screw into the reg so you can do whatever you want

[datsqik]

I dont know why i wrote aeromotive I meant to write Magnafuel. Probably looked at to many fuel systems in the last couple of days as I'm looking to upgrade as I'm switching to methanol.

http://www.magnafuel.com/products/efi/regu...s/MP-9940-B.htm

You can buy these from places like Jegs or Summit Racing for around $220us

[GeeTR]

I cant see reusing the stock lines as twin feeds as being economical, the lines willneed to be removed from the car anyway to silver solder the fittings either end

Cant you double flare the end and use a hard pipe fitting...?

[GreeceS13]

If I was you I would replicate the standard feed and return lines in ally tube (this is the only cheap part), solder -8 fittings either end, split the feed to twin -6 for a twin feed rail and return from the middle of the rail to a good reg ie aeromotive and back through the -8 line.

http://www.aeromotiveinc.com/products.php?...b=1∏=11

I cant see reusing the stock lines as twin feeds as being economical, the lines willneed to be removed from the car anyway to silver solder the fittings either end (not to mention four off instead of two), would be much easier to just copy in larger id ally and halve the no. of fittings.

btw do it in teflon braid... and yes the jap rails come with -6 fittings, just replace the centre return with -8

Ok but this aeromotive fpr have... Two -10 AN inlet ports, one -6 AN return port and 1/8" NPT gauge port

-8 fuel line and fittings to the rail is good for 500-800hp and -10 is good for 800-1100hp and the return from the reg can be one size smaller than the supply. Aeromotive make a reg with 4x -8 inlets and a -8 outlet.

Can you tell me which? I see 8AN or 10AN outlets only at pro series for 2000horses!

The most cheap aeromotive regs have 6AN or 6ANx2 for return...

simple, get -8 adapters to screw into the reg

This is the point I need help guys!!!

Ok you said me to use 8AN hoses... but if the fpr have small holes like sard that has 6AN( http://www.rhdjapan.com/images/product/102...rmal/Image3.jpg ) or malpassi or aeromotives with 6AN, will can flow the return fuel? Or if I will have fpr with small holes (6AN) it will not have any difference if I have 8AN or 6AN return hose?

Please someone to explain me this because it is the only problem that I have...

So if I can use 6AN fpr I will put fittings like this ( http://www.rhdjapan.com/jdm/SARD-Fuel-Pres...-8-NPT1-8-17630 ) and I will use 8AN return hose?

be far easier to just get a1000 instead of the a1000 -6

in any case you need to buy the fittings you screw into the reg so you can do whatever you want

A1000 use Two -10 AN inlet ports, one -6 AN return port and 1/8" NPT gauge port

Are you sure if I will put just fitting it will flow the fuel? I ask more in the previous quote...

I dont know why i wrote aeromotive I meant to write Magnafuel. Probably looked at to many fuel systems in the last couple of days as I'm looking to upgrade as I'm switching to methanol.

http://www.magnafuel.com/products/efi/regu...s/MP-9940-B.htm

You can buy these from places like Jegs or Summit Racing for around $220us

Yes I know them and it have 10AN Inlet and 8AN return but it is for 2000hp it is a bit expensive....

There isn't any other cheaper choice?

I try to see other guys cars too see what they did...

http://www.skylinesaustralia.com/forums/Ju...-Un-t98086.html

StageZilla rb26 t04z

His fuel system..

sard 1000cc injectors

sard dual entry fuel rail

sard adjustable fuel pressure regulator

bosch 044 fuel pumps x 2

goss intank pumps x 2

Alloy surge tank

twin fuel lines from pumps to engine

And a foto here from Stagezilla's car... I am thinking that he use 6AN hoses from rail to fpr to surge.

Performance costs money... we've told you this a number of times

I know mate... check my sign.. I paid a lot and this is the last part I need! But I want to be sure that I will pay what I need for my setup and don't pay parts for 2000hp!

Ofcourse I will pay either aeromotive pro series or the magnafuel if you will say me that I cannot work with smaller fprs!

But the Stagezilla use only sard fpr and he has 044 pumps that they have more flow than my walbros!

Thanks for your help guys

Edited March 12, 2008 by GreeceS13