Fuel injection Return Line Question

[TJBrown]

OK, i used to run a MegaSquirt Fuel Injection system on a Turbo car a few years back. Well i had the whole ECU setup in the closet so i decided i am going to convert from Carb / HEI to EFI and Spark with MegaSquirt.

Question is, does anyone have any recommendations on what to do since i have dual tanks and need to have a return line to the take being used? Anyone crossed this bridge yet? Any advise would be great.

[gmtec93c1500]

i havint crossed this bridge yet but what i would do is run an equalizer line from one tank to the other like a semi dose ... theres a line comes off the bottom of one tank and runs to the bottom of the other ... if you wanted you could plum your return line into this

[Jonboy]

If you run the dual tanks, you need to get a higher pressure switching valve also. The tanks each have a return already, the switching valve opend the feed and return to each tank (and turns on the fuel pump) depending on which tanks is being used.

[bloodybronco]

I'm in the middle of this aswell, so more input would be nice. My way, in my opinion is over complicated, but because i have most of the parts already lying around, it's going to mostly only cost time rather than money. i was just planning on putting two low pressure fuel pumps on the same switch as my fuel guage change over lined to a "fuel surge tank" that will have 6 lines on it. 1. engine feed - with a high press fuel pump. 2. engine return. 3,4 feed, return left side. 5,6 feed, return right side. so i have 3 fuel pump relays all signalled from a pigtailed ecm wire to power the 3 pumps. the surge tank will let me turn a corner without stalling, or cavitating my high press pump. while using my stock tanks and sending unit. the problem is that i am returning an unknown amount of fuel to two tanks at the same time, while only feeding from one. This shouldn't be a big problem, as i normally have gas in both tanks. If i am filling the tank i'm not using, i will just switch tanks when the one i am using is empty. i know it doesn't answer your question but but just thought it might give you ideas. You could get a hydraulic manifold where it's basically your carbureted fuel feed switch stacked, on the same switch but for higher pressure. don't have a specific example of a switch like that, but i work on heavy duty and we have lots of similar switches, where one switch controls 4 different things.