1) Fuel injection hose for external routing has an SAE 30R9 rating for continuous & pressurized fuel flow use.
This is not the same rubber fuel hose as used on carbureted applications:

2) Fuel injection hose for in-tank (immersion) use has an SAE 30R10 rating, which contains a
special compound called fluoroelastomer (FKM), which resists fuel permeation and retards aging:

3a) The appropriate gasoline resistant thread sealant for fittings
and the like, is Permatex Aviation Form-A-Gasket sealant liquid:
(Read this forum POST for Automotive Gasoline Resistant Silicone RTV.)

3b) The appropriate gasoline resistant Teflon Paste thread sealant
for fittings and the like, is Permatex & Loctite Teflon Paste:

4) Red (high temp, high strength), blue, purple & green Threadlocker, is also impervious to automotive
fluids such as motor oil, gasoline, brake fluids, transmission fluids, alcohol and antifreeze solutions.
(It's also a great bonding agent for freeze plugs.)

5) Fuel injection type hose clamps (always available at your local auto parts store):
https://www.holley.com/brands/earls/...ard_hose_ends/ (Vapor Guard Fuel Injection Hose Clamps)
https://www.holley.com/products/plum...arts/750000ERL (Vapor Guard Hose Clamp Pliers)
https://www.holley.com/brands/earls/...es_and_clamps/ (Super Stock Fuel Injection Hose Clamps)
https://www.holley.com/products/plum...arts/818000ERL (Super Stock Hose Clamp Pliers)
https://www.holley.com/products/plum.../parts/D022ERL (Earl's D022ERL Hose Cutting Tool)
https://www.holley.com/products/plum...ools/wrenches/ (Earl's AN Wrenches & Wrench Kits)

6) EFI Compatible Hose Types:
http://www.gates.com/products/automo...ction-hose-mpi (Gates MPI Fuel Injection Barricade Fuel Hose)
http://www.gates.com/products/indust...-225-barricade (Gates Marine Master 225 Barricade Fuel Hose)
http://www.gates.com/products/automo...fuel-line-hose (Gates Heavy Duty Submersible In-Tank Fuel Hose)
http://www.gates.com/products/automo...ative-emission (Gates PCV/Evaporative Emissions Control Hose)
http://www.gates.com/products/automo...fuel-fill-hose (Gates Fuel Filler Neck Hose)
http://www.gates.com/products/automo...ller-neck-hose (Gates Fuel Filler Neck Hose)
Contact Chris Myer at Fuel-Pumps.net or EFISystemPro.com. He's a fuel pump specialist & Holley EFI distributor/EFI parts professional.

Originally Posted by Danny Cabral
• Procedure for creating a barbed end on a cut-to-length steel tube:
(Hose doesn't slip over a double-flared end. A barbed end is the proper means of attachment.)
Cut and deburr the steel tube using a tubing cutter.
Assemble line in double-flaring tool, the same way you would if creating a double-flared end.
Compress the double-flare die about ½ way down and stop and inspect the result.
It's important not to let the die tilt on its way down, because we're not going all the way down.
Compress more if necessary to create the desired barb shape. It's visible in the tool.
The end result is a perfect barbed line, ready for slipping on and clamping a hose.
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• If you don't need to cut (shorten) the steel tube, you can also use an inverted flare/barbed adapter fitting - no cutting, soldering or flaring:
http://www.plews-edelmann.com/push-on-rigid-female/ (3/8" Female Inverted Flare, 3/8" Barb Fitting - Edelmann 724660)
http://www.plews-edelmann.com/produc...-style/724560/ (5/16" Female Inverted Flare, 3/8" Barb Fitting - Edelmann 724560)
http://www.plews-edelmann.com/produc...-style/824550/ (5/16" Female Inverted Flare, 5/16" Barb Fitting - Edelmann 824550)
http://www.plews-edelmann.com/assets...ings_90078.pdf (Complete Edelmann Catalog)
Originally Posted by Danny Cabral
Fuel Injection applications: 100 micron pre-filter, 10 micron post-filter.
Carburetor applications: 100 micron pre-filter, 40 micron post-filter.
Holley offers billet aluminum filters with stainless steel elements.
The 10 micron filter element is a depth media (paper) type element.
The 100 & 40 micron filter elements are stainless steel woven mesh.
https://www.holley.com/products/fuel...lters/filters/ (Billet Aluminum Filters)
https://www.holley.com/news/articles...5_compatible_/ (E85 Compatibility News)
http://documents.holley.com/holleyfu...ems_chart1.pdf (Fuel System Selection Chart)
http://documents.holley.com/flyer_ho...el_systems.pdf (Holley Fuel Systems Catalog)

Also, Earl's Performance Plumbing offers Teflon (PTFE) inner lined, stainless steel
braided or Kevlar hose (Speed-Flex & Ultra-Flex 650) for compatibility to any fuel.
https://www.holley.com/products/plumbing/ (Earl's Products)
https://www.holley.com/document/tech...ing_basics.pdf (Plumbing Basics)
http://documents.holley.com/earls_guide.pdf (Earl's Hose & Fitting Compatibility Guide)
(Read Sections 10.0 & 10.1, "Plumbing" & "Fuel Line Sizes", Pages 7 & 8)

Earl's offers stainless steel & Ano-Tuff Speed-Seal hose ends for their Speed-Flex hose.
Ano-Tuff is MIL-Spec Type 3 hard anodized for excellent wear & corrosion resistance.
Both are impervious to fuel blends, ideal for use with alcohol fuels and marine environments.
https://www.holley.com/brands/earls/...ds/speed-seal/ (Stainless Steel & Ano-Tuff)
http://documents.holley.com/199r10733rev1.pdf (Speed-Seal Instructions)
(Earl's Performance Plumbing Catalog)
Originally Posted by Danny Cabral
The in-tank "sock filter" is actually an excellent pre-filter. I've experienced some problems with that small plastic pre-filter (with external
in-line Walbro fuel pump). After experimenting with different options, I found that using a sock filter (just like the OEM in-tank pumps use)
was the best pre-filter option. I also drilled out the fuel pump's suction side fitting to allow easier volume. These are the only two aftermarket
sock filters I've ever seen for 3/8" pick-up tubes. They're designed for external pumps - perfect for aftermarket EFI systems:
http://www.atlinc.com/pdfs/2014-2015...b-COMPLETE.pdf #TF268 Link ("Fits #6 Fuel Pick-up" - page 19)
http://www.fuelsafe.com/pdf/FuelSafe...atalog_web.pdf #FS06, FS38 ("Fuel Pick-Up Kits" - page 27)
https://www.holley.com/products/fuel_systems/hydramat/ (Holley HydraMat - A Better Option)
https://www.holley.com/products/fuel...s/parts/19-174 (Holley 19-174 EFI Fuel Tank Vent)
Originally Posted by Danny Cabral
Since I discussed fuel plumbing aspects, you might find this helpful.
Forum posts by Brian Macy - TurboNova (Instructor at EFI University)
that really parallels everything I've done with my own fuel system:
http://www.cpgnation.com/forum/threa...06/#post-72225 (Pump Cavitation)
http://www.cpgnation.com/forum/threa...77/#post-74345 (Suction Side)
http://www.cpgnation.com/forum/threa...44/#post-75311 (Pump Fittings)
http://www.cpgnation.com/forum/threa...10/#post-68486 (Tank Venting)

In-tank pumps are great, however, I've never had a single problem with an external in-line pump.
My external in-line fuel pump has never been mounted below the level of the fuel tank.
It's more important to mount the fuel pump as close to the tank as possible, keeping the suction line as short as possible.
Drill the Walbro pump's inlet & outlet fittings a little larger, and use the shortest possible suction hose.
My fuel pump has been mounted near the top of the fuel tank for over 12 years and never had any problems.
UPDATE: I now have a custom made fuel pump module mounted on the fuel tank frame crossmember like THIS.

I've never used the ECU's fuel pump trigger wire to directly power the pump (even if it is less than 10 amps).
I've always used a separate relay (shown below) because that green wire is still only 14 AWG.
The 2nd fuel pump relay is used so the fuel injectors aren't subjected to the pump's amp draw.
It's only a 20 amp fuse and it also feeds power to the fuel injectors (& ignition coils - LSx, MOD & HEMI).
I prefer to use 10 gauge wire due to its long length, especially for high output race pumps.
Simply use the green fuel pump wire (+12V) to trigger your additional fuel pump relay's coil (+) terminal #86.
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https://www.holley.com/products/fuel...s/parts/12-753 (Holley 12-753 Fuel Pump Relay Kit)
(Holley 12-753 Fuel Pump Relay Kit Instructions)
https://www.holley.com/products/fuel...arts/30-199QFT (Quick Fuel 30-199QFT Fuel Pump Relay Kit)
https://www.holley.com/products/fuel...s/parts/40100G (Mr. Gasket 40100G Sealed Relay Kit)
https://www.summitracing.com/parts/pco-5593pt/overview/ (Pico Wiring 5593PT Sealed Relay Kit)
Delphi Metri-Pack 630 Pull-To-Seat female terminals for retrofitting to a sealed relay socket connector:
#12033997 10/12 AWG (3.0 mm²), #12066614 14/16 AWG (2.0-1.0 mm²), #12020156 18/20 AWG (0.80-0.50 mm²)
Originally Posted by Danny Cabral
Holley EFI Performance Fuel Pumps:
Holley EFI 12-920 fuel pump: 10mm x 1.0 internal threads (Walbro GSL392)
http://www.fuel-pumps.net/walbro-forgeries.html (Buy Holley or other legitimate source.)
https://www.holley.com/products/plum...arts/991953ERL (Earl's -6AN Blue Anodized Fittings)
https://www.holley.com/products/plum...ts/AT991953ERL (Earl's -6AN Black Ano-Tuff Fittings)

I'm a bit skeptical about the high horsepower ratings of this fuel pump.
The pressure it produces can certainly support the horsepower ratings.
However, I doubt the small I.D. of the fittings can support high volume.
If you're anywhere near the limit of this fuel pump,
I suggest Holley's new line of performance fuel pumps:
https://www.holley.com/brands/holley...fi_fuel_pumps/ (Billet Electric In-Line Pumps)
https://www.holley.com/news/articles...5_compatible_/ (Fuel Type Compatibility)
http://documents.holley.com/holleyfu...ems_chart1.pdf (Fuel System Selection Chart)
http://documents.holley.com/flyer_ho...el_systems.pdf (Holley Fuel Systems Catalog)
https://www.injector.com/injector_selection_guide.html (Marren Fuel Injection Calculator)
https://www.holley.com/document/tech...l_injector.pdf (Selecting a Fuel Injector)
(Injector Dynamics BSFC Guidelines)
https://www.holley.com/brands/holley...ion/injectors/ (Holley EFI Fuel Injectors)

(Convert GPH to PPH)
http://convert-to.com/conversion/flo...r-hr-flow.html (Convert PPH to GPH)
http://convert-to.com/conversion/flo...line-flow.html (Convert LPH to PPH)
http://convert-to.com/conversion/flo...r-hr-flow.html (Convert LPH to GPH)
http://convert-to.com/conversion/flo...-min-flow.html (Convert LPH to GPM)