I want to purchase the fuel line and fittings soon and think I have a good idea what I'm doing. Read the Coast Guard approved info and plan to work with a supplier that is also knowledgeable. Any fuel fitting suggestions ? AN stuff looks nice but I'm thinking Stainless steel from Titan fittings in Colorado. My fuel line path is as follows. I have two spun aluminum 12 gal fuel tanks with 3/8 npt outlets in the bottom of the tanks. One tank is fitted with a # 8 AN fuel return port also this tank has the fuel level sender. I am thinking of running lines from each tank to a T, then to a pre-filter, then the fuel pump, then another filter, then to the engine. I'll put a pressure regulator on the return side of the injection rails and run a line back to the AN fitting on the tank. Both tanks have vents with roll over protection. Your thoughts are all greatly appreciated. Thank you!

I like all the push-lok hose & fittings. coast guard says a boat cant come new from the manufacturer with them, but after that its what ever you feel safe with. cigarette delivers/ed new boats with push-lok hose & fittings for many many years. they did anyways. dont know if they still do or not.

Thank you Ed! Eventually I also need to make the oil lines from the engine and the transmission to the heat ex changer. I feel like I'll have these made to order versus push lock. Will most likely cost a bit more but hopefully more durable.

Ayuh,..... I believe you'll find the coast guard don't like tanks which draw from the bottom, as a fuel line failure will dump the contents into the bilge,....
Boat fuel tanks draw from the top, with an anti-siphon valve. right at the tank's exit,....

Interesting! Thank you Bondo! I think I still have the opportunity to fix the fuel pickup to top draw. So I will look into doing this.

I used push lock AN fittings and used Oetiker clamps to wrap the hose at the fittings.
I had to have my boat surveyed for insurance. The surveyor took no issue with my hoses meeting USGC regulations.
They have been in operation for several years with no issue.

I have purchased two new 3/8 npt. bungs, which have been welded to the top of my two fuel tanks. Also two siphon tubes and anti-siphon valves. So now my two 12 gallon spun Aluminum fuel tanks are all set for top fuel draw. The next thing I need to do is purchase the fuel pump and filters plus fuel line and clamps. Over the last two weeks we finished gluing in and reinforcing the two struts with the boat upside down. After filling the cavity between the struts and keel with epoxy, I added four layers of carbon fiber and four layers of fiber glass with epoxy forming a 90 degree flange between the strut and the bottom of the keel and boat. This was all sanded and fared and a new coat of bottom paint applied. Boat is now back in the upright position and I striped the transom down to almost bare wood. Applied a thin coat of epoxy mixed with colloidal silica and the red stain powder to make it look uniform in color and appearance. This worked great. Very happy with how this turned out, so we decided to strip and re-sand the decks to do the same process.

I would change the fuel pickups from the style you have and go with completely stainless steel pickups. Here are a few pics of my old pickups and the new ones, The old ones get pretty rough looking after a few years.

I like the nylon braided compression AN fittings...

From were did you purchase the SS tubes?