Fuel system requirements

[PN in KC]

I've been (over) researching what I need for my fuel system, from tank to engine. I'm using a blueprint 427 with EFI and have the complete kit. I'd love some advice on what if NEED to have and any recommended upgrades. I'm thinking about buying the in-tank fuel pump assembly from Breeze (or anywhere really) but they have 3 different ones and not sure which is best considering the note below from Blueprint.

Blueprint says it includes Fuel Delivery: Holley Sniper EFI complete system. Includes electric external mount fuel pump. So, I may be getting everything I need and just need to throw out the filter that came with my kit?

[Al_C]

I believe that everyone here will tell you that you need to size your pump and lines correctly. Too much fuel is better than not enough. Not enough results in a lean condition which causes too many other problems. Fuel requirements are a function of HP. Blueprint should be able to tell you what the fuel requirements are for your 427. You may be OK with the 5/16 and 1/4 lines provided in the kit, but you'd be better served with 3/8 lines in both directions. If I remember correctly, the kit came without an in-tank pump and hanger. I think that came with my engine. In my case, I initially installed a 155 lph pump along with the 5/16 feed and 1/4 return. That proved to be a bit undersized for my Gen II coyote. It was fine until I got it tuned, but I think I crossed a line at that point. I now have a 190 lph pump, which is reportedly the largest you can use with 5/16 feed and 1/4 return lines. My engine is producing 390 at the wheels.

If I were to do it all over again, I'd get a 255 lph in-tank pump, use a hanger that's designed for 3/8 inch lines on both sides, and run 3/8 lines both ways to/from the regulator. I have the 3/8 lines in place, but the section between the tank and the fuel filter is 5/16, and the return is reduced to 1/4 at the tank, so I'm really constrained to the original size. My suggestion is to ask Blueprint what your requirements are and go from there.

[FLPBFoot]

I'm running a 427 from BluePrint. I used the supplied external Holley Red pump and ran 3/8" inch SS braided lines. Their set up all works great except the Holley Red pump was LOUD! I could hear it even when the motor was idling. I upgraded to the Holley HP 125 which is a much better pump and is very quiet. I have to listen pretty hard to hear it running when I turn the key to verify it pumps the system up with pressure before I start the engine.

If I were to do it again, I'd go with an in tank set up probably from Breeze or Mike Forte. Call Mark and/or Mike and they will help you pick the system that will work best for your build.

[CaptB]

This is what I used for my 427, it allows you to run a single line to the engine:

https://breezeautomotive.com/shop/fuel-filter-regulator-and-single-line-kit-for-sniper-in-roadster-remote-mount/

[TBull]

If I were to do it all over again, I'd get a 255 lph in-tank pump, use a hanger that's designed for 3/8 inch lines on both sides, and run 3/8 lines both ways to/from the regulator.

I agree with Al_C. For an EFI 427, I'd do a Walbro 255 LPH as well. There are multiple 427W builds in our club over 500 RWHP. Pro_M racing has a hanger that a lot of us have used with AN fittings for both the feed and return. It also reduces cavitation of the fuel on return that the original hanger doesn't do. I have a -8 all the way to the fuel rails with the -6 return and a 450 LPH pump in mine. Like others have said, it all depends on your horsepower and fuel needs. If you're doing a first time install I'd do it this way and not worry about it in the future.

[PN in KC]

Thanks all, talked to Mark at Breeze this morning and all set!

[mladen]

Seems like you're all set. Agree with everything above. The Breeze pump will do a great job, and you definitely want a 3/8" feed and return lines. I opted for hard lines, which limits a bit the choice in fittings. You can read in my build thread here (https://thefactoryfiveforum.com/showthread.php?43812-Mladen-s-MK4-Build-Thread&p=504234&viewfull=1#post504234) of my exploration in learning about the two thousand seven hundred and forty eight different standards out there and where I eventually found the right ones. Sniper instructions say to use a pump that can do 58-60 psi.