I'm going to do two posts tonight, They deal with different aspects of my build. One (this one) is a request for help. The second one will just be information sharing.
I'm trying to get everything done in the transmission tunnel so that it is finished and done with. Part of what needs to be done is plan for, and route, the 2 fuel lines. In my case, the donor engine has EFI with a fuel input line and a high pressure return line from the EFI system to the fuel tank. Because there is much to be done in the engine compartment and rear kick-up (it carries the future fuel tank), I want to leave those until later.
Here is a horrid, but useful schematic of what I'm after:
Attachment:
Fuel System Schematic.jpg
The part I need to do now is the
red part. However, I need it to eventually interface to the two blue parts: fuel tank; and engine. I know what the engine needs. However, the fuel tank will be up to me and I'd like to do something standard, simple and effective. I have no design for the fuel tank yet.
The blue parts come later as I mentioned. However, I need to terminate the two ends of the
red part to some sort of "interface block", which I have no real idea about, but need to identify and purchase now. That's question #1 that I need to solve, "What should I use at each end, and where do I find it?
The second issue is the size of the two fuel lines. The outside diameter of both the fuel and return lines now are 5/16". Those service the stock donor engine of 195HP. Eventually, the engine will have close to 300HP. So, the second question is, "Should I up the size of the fuel and return lines now as the fuel flow required later may require extra volume?"
I'm hoping someone will know the best answer, and I won't have to spend a lot of time trying to figure out and estimate what the EFI system might require at 300HP as this is beyond my knowledge today.
I'd like to run hard lines for the
red part in the tunnel for simplicity of routing and attaching. The other two ends, the blue parts, I'd like to do in flexible hose because the routing of hard lines would be difficult.
Here's what the donor fuel line system under the car, and to the engine looked like:
Attachment:
Donor Fuel Lines 1.JPG
Attachment:
Donor Fuel Lines 2.JPG
Attachment:
Donor Fuel Lines 3.JPG
Attachment:
Donor Fuel Lines 4.JPG
I don't know what those EFI attachment joints are called, but they appear on a number of other vehicles beside my Ford Mustang donor. My front interface block will need to accept hard line fittings in and output to flex line fittings identical to these.
At the rear, I'll probably use A/N fittings as every fuel tank maker seems to deal with those. However, if NPT fittings make more sense, and I can find suitable high pressure flex lines (the Mustang uses 40-45 PSI input) that's fine too. I just need to be smart about the "interface block" at rear and make sure it's something that won't limit my possibilities later, if possible.
Any help on these three things (line size, interface blocks and compatible engine flex line fittings) would be very much appreciated.
Cheers,