How To Properly Add A Fuel Return Line for EFI Installation

Link to some of the fuel line ends I am using in the video:

After watching a handful of videos in adding a fuel return line the wrong way, I decided to make a video showing the proper way to do this so you don't introduce aeration into your fuel system.

Link to some of the fuel line ends I am using in the video:

[robertclymer]

This video makes perfect sense. Air in the system will cause all kinds of issues. Thanks for sharing your knowledge! Cheers from Motown.

[richardengland]

Yes, a very important step. Make sure you use a hose that is submersible rated.

[treasure_hunters]

Thanks very much for this tip. I will be doing this very thing this coming week. Glad I watched this. Saving me in long run from loosing my mind!! Thanks ✌️

Absolutely spectacular video! Thank you very much for this information! I have only one other idea of potential improvement. Everything in the tank by default, which the gasoline would constantly be steeped with, is pure authentic metal. I don't like the idea of a rubber hose being constantly steeped in gasoline. This might potentially cause the gasoline to become contaminated by the rubber, and cause the rubber to become deteriorated by the gasoline. The best option is to mount an authentic metal return line into the tank itself.

[HaydenJames]

Hey thanks man! This is what I thought was right but a friend told me it only barely had to go in the tank. He's a bit more experienced with fuel systems than I but it didn't seem right to me and you just confirmed it! I appreciate you taking the time to make the video.

[michaelbonjour]

Put a stranded insulated wire still connected to its spool through the holes drilled for the return line, use a grabber or bailing wire with a hook and catch it the the main opening, push the wire through the nut or vapor guard bolt, make a knot or put a stop (I used a large washer), the piece of wire that goes in the tank should, coming off the spool> through the return line im hole drilled into the tank> throughly vapor guard etc>then have the knot>ensure the vapor guard Al can’t slide passed the knot or stop and pull toward the spool, with a little finesse you should be able to do it quickly and easily! Thanks for the vid

[mrmotofy]

Using the AN bulkhead fitting you can also just flare an aluminum line instead of the hose. Then add the proper flare nut and tighten it up...Again not easy inside the tank but doable if you position it correctly. Use a cheap lil electric fuel pump with a clear filter on it to suck up any shavings in side the tank.

[robertmangieri]

Thanks for the part numbers man that was a huge help! Much appreciated.

[LH-kznf]

After watching this I'm not sure what I should do in my situation now.
I'm building a blow through turbo set up for my Sportster. I'll be running a low pressure fuel pump and boost referenced regulator. I'll have to fit my tank with a bung for a fuel return. The bung will be fitted up through the bottom of the tank. I was told to attach a down pipe to return the fuel to the top of the tank where it would be above my fuel level. The reason was to avoid the head pressure from the fuel inside the tank on the fuel being returned because of the fuel being returned upward through the bottom.
Way back in the day a company the made turbo kits for these bikes used the vent tube for a return. My vent tube is only 1/8" and points directly up to the under side of my fuel cap.

[jeffokelley]

I did the same exact thing with the efi hose, works great

[glennstock]

Did you notice on the diagram the separation between the fuel pick-up and the return tube? Where you are mounting this return extension tube into the tank would be 3-4" away from the fuel pick-up tube. The pick-up tube would suck any air bubbles in.

[TheLuckyone]

Thank you for this. I'm about to install my EFI tank for my 50 Chevy Deluxe with LS1

[ronaldjacobs]

thanks for taking the time to make this important point.

[Moparbarnett]

If there is room, can I drill and add the return line on top of the sender, take the sender out drill and install the fitting?

[tprince]

Thanks for the Info, it was extremely helpful for my CJ7 Sniper EfI BBD install

[cbrSpeedster]

Thanks my friend. I'm planning an EFI conversion soon myself. One question. Would it also be helpful to have a a fitting and plate fitted with a strong magnet to hold the hose down to the bottom of the tank? Wondering if over time the hose with curl up.

[yaboihuskymolly]

found something that my ass LMAO. i like that you talk about the video as if ur friends are working with you

[alanp]

nice video, would be cool, if you added in the complete parts list and what size drill bit did you use for the bung?

[fiatmonkey]

I didn’t scroll through all the comments so hopefully I am not asking same question already but could you tap and add a return hole/inlet line at the same level and close to the stock/existing exit/line on the tank?

[LukeBrinkerhoff]

Not car related, or carb conversion. I have a crashed motorcycle that’s already EFI, but the tank is destroyed and fuel pump. I have a inline fuel pump, and can put that down into a gas tank, with just the return line shooting in at the top. It runs fine like this, but my real question is I am just gonna have a normal fuel tank gravity feeding to the pump, with a decent size inline fuel filter. But I won’t have anywhere to put the return line, I was just going to get a T connector right after the petcock for the return, but was worried that it might be too agitated to work properly, but at the same time be fine. In the end I won’t loose anything trying.