Custom Fuel Lines

[MXD]

Hey guys, im trying to peice together my own fuel system, and was wondering what AN fitting or NPT fitting size threads into the fuel pump assembly?? For example, SBR has a fuel AN line kit from tank to fuel filter, but im looking to do something different then what they offer so i was wondering what fitting they use for their kit. Hope i make sense and hope someone can help. Thanks guys.

 

[99gst_racer]

Use 6AN hose and fittings (unless you plan to exceed 450 HP or so...).

Here's a pic of something I put together for a local DSMer that was doing exactly what you are doing.

http://www.intrastar.net/~kdogg/dsm/sending_unit/DSC02454.JPG
http://www.intrastar.net/~kdogg/dsm/sending_unit/DSC02458.JPG
http://www.intrastar.net/~kdogg/dsm/sending_unit/DSC02457.JPG
http://www.intrastar.net/~kdogg/dsm/sending_unit/sending_unit_riggin.jpg

He chose to run some reinforced rubber hose and push-lock fittings. You could easily put this together with a different 90* fitting and you could run the stainless braided hose unstead of the rubber.

Run the -6 hose all the way to the firewall, and then into an inline fuel filter. Then out of the filter into the fuel rail. This would be a very easy kit to put together. I am going to do this on my GST in a few months and I will make sure to do a write-up on it.

 

[MXD]

So you guys just put a AN fitting through the fuel pump housing and attached the hose from the pump to it?? Thats a good idea.

In this Photo (http://www.intrastar.net/~kdogg/dsm/...t/DSC02454.JPG
) How did u guys keep the hole that the fitting on the bottom of the mounting plate and the one above the mounting plate goes through from leaking?

Thanks for your help so far

 

[pinder91]

Paul, what do you recommend for applications over 450 hp?

Brandon, Matt, and I keep talking about doing this in the spring, and I'm really looking forward to it.

 

[99gst_racer]

Well, first, I'll start by saying that the only reason he was prompted to do this was because of a crimp in the factory hardline that runs through the plate. He cut both ends of the hardline off and then drilled the hole out on the plate. That assembly that you see consists of a -6 bulkhead and a couple lock nuts. And then the AN push-lock fittings screw on each end of the bulkhead.

Here's a pic of the bulkhead:

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[99gst_racer]

Paul, what do you recommend for applications over 450 hp?

Brandon, Matt, and I keep talking about doing this in the spring, and I'm really looking forward to it.

I honestly dont know exactly where the limit of fuel delivery is with the -6 hose. It very well could support 600HP, but I honestly dont know for sure. The next step up would be -8, which is rather large. I believe Shep is running -8 or -10.

Andrew, on a car like mine, yours, Brandon's or Matt's, -6 will be more than enough to deliever the fuel we use.

 

[pinder91]

Thats what I thought. I couldn't imagine needing anything bigger than that even after the upgrade to Matt's magic turbo.

 

[MXD]

Do you use o-rings on both sides of that Bulkhead fitting to seal it or does it seal enough on its own when it is tightened down? Thanks i know what ill do now.

Well, first, I'll start by saying that the only reason he was prompted to do this was because of a crimp in the factory hardline that runs through the plate. He cut both ends of the hardline off and then drilled the hole out on the plate. That assembly that you see consists of a -6 bulkhead and a couple lock nuts. And then the AN push-lock fittings screw on each end of the bulkhead.

Here's a pic of the bulkhead:

You must be logged in to view this image or video.

 

[99gst_racer]

You put the longer end though the hole in the fuel pump plate, then tighten it down with the aluminum locknuts.

All JIC/AN fittings have a self sealing 37* flare, so there is no need for o-rings anywhere...

 

[turbodsm18]

What do you think the cost difference is between building your own fuel lines or just buying the kit from SBR.

 

[Black94DSM]

Do you use o-rings on both sides of that Bulkhead fitting to seal it or does it seal enough on its own when it is tightened down? Thanks i know what ill do now.

Answer Below

You put the longer end though the hole in the fuel pump plate, then tighten it down with the aluminum locknuts.

This will end up leaking eventually, Jaz, Aeromotive, Aeroquip, Goodwrich, ect... have Nylon Washers to go inbetween the metal and the bulkhead to serve as a seal. You need to have these on there in order to make the right seal.

Heres a link to some summit brand, just a random size.
http://store.summitracing.com/defau...eywordSearch&DDS=1&N=115&target=egnsearch.asp

All JIC/AN fittings have a self sealing 37* flare, so there is no need for o-rings anywhere...

This is correct.

The -6 line is supposed to flow enough for around 600 hp.

 

[MXD]

You guys are great man! Thanks i now know everything i need to finish this fuel system. Thanks a lot 99gst_racer and the rest you that helped. I appreciate it.

 

[GeosTalon]

You can also use:

http://www.stevetek.com/R-FuelSys.html

They sell fittings for the rail end for Ebay if you don't feel comfortable with modding the rail the way they show you on that page.

 

[GeosTalon]

Here is a link to the fitting you are looking for, took a little research to find.

http://store.summitracing.com/default.asp?target=partdetail.asp&part=EAR-9894DBHERL

 

[99gst_racer]

This will end up leaking eventually, Jaz, Aeromotive, Aeroquip, Goodwrich, ect... have Nylon Washers to go inbetween the metal and the bulkhead to serve as a seal. You need to have these on there in order to make the right seal.

This is correct. However, I just want to clarify for anyone who might read this.

The potential leak described in the above quote is not referring to the fluid transfer through the fitting and/or hose themselves. It's referring to sealing the bulkhead on the fuel pump plate. If the locknuts come loose, it would not leak from the fitting or the line, but it could potentially leak out of the fuel pump plate. I too would recommend running one of the nylon washers on each side of the fuel pump plate.

 

[Black94DSM]

This is correct. However, I just want to clarify for anyone who might read this.

The potential leak described in the above quote is not referring to the fluid transfer through the fitting and/or hose themselves. It's referring to sealing the bulkhead on the fuel pump plate. If the locknuts come loose, it would not leak from the fitting or the line, but it could potentially leak out of the fuel pump plate. I too would recommend running one of the nylon washers on each side of the fuel pump plate.

Yep, thats why i put that you were correct about the 37* flare on the fittings, so that you would not need any sealant or o-rings.

 

[DSM90AWD]

Not to disuade you from purdy $$braided lines, but for ~1/3 less money you could just use upgraded hard lines (Steel, SS or AL) for the run from the pump to the firewall. The Tube Sleeve/Nut Fittings are also pretty inexpensive.

Stock lines are 3/16"

-6AN = 3/8" Hard Line
-8AN = 1/2" Hard Line

 

[larsrya8]

...you could just use upgraded hard lines (Steel, SS or AL) for the run from the pump to the firewall...

Aren't hardlines considered safer too? Less likely to be damaged by debris or something...

 

[GeosTalon]

Hardlines are harder to work with, harder to fit through tight areas. I would imagine that braided line is going to withstand more abuse since the braided.

 

[DSM90AWD]

Hardlines are harder to work with, harder to fit through tight areas. I would imagine that braided line is going to withstand more abuse since the braided.

The Braided SS lines are 2x the thickness of the metal equivelants, what makes you think it would be easier to route?

A $9 tubing bender can make 90* bends in the metal line all day. Try that on a braided line without kinking

 

[Turbo Juice]

does anyone know the size of the fitting for the fuel outlet on the pump. so that you dont need a bulkhead?

also is there a fitting for the bottom of the stock fuel filter? if not what is an inexpensive inline filter to use.

 

[Black94DSM]

The Braided SS lines are 2x the thickness of the metal equivelants, what makes you think it would be easier to route?

A $9 tubing bender can make 90* bends in the metal line all day. Try that on a braided line without kinking

And if you opt for the Aluminum lines you can hand bend them yourself, they are really easy to move around.

 

[DSM90AWD]

also is there a fitting for the bottom of the stock fuel filter? if not what is an inexpensive inline filter to use.

If going to all this trouble to increase flow from the tank, ditch the anemic flowing OEM Fuel filter.

You need a minimum 10micron filter for EFI applications. The cheapest I found (actually bought it last week) is the "Large" Golan which is $51.95 at Rex Marine flows 900gph and comes in inlet/outlet sizes of -6AN thru -10AN.

Mr Gasket used to sell this under their brand name.

Pretty filter

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[DSM90AWD]

I plan to run one of the inline Earls filters when I do this. The retail for about $30.

As an FYI, the Earls inline filter is not recommended for EFI apps as the only two media options are 35micron (Sintered Bronse) and 85micron (Stainless Steel). 10micron is the minimum media size per Earls (and Summit Racing)

 

[Black94DSM]

So a 10 micron is what is needed for our cars? If so here is a cheap route to go, its made my Edelbrock so i know its good. And its got barb fittings on it for the ease of installation. How do you think this would fair to the other high dollar versions ?

http://store.summitracing.com/defau...eywordSearch&DDS=1&N=115&target=egnsearch.asp