So, I'm getting parts together to build a fuel system. I was going to do the standard regulated return that most folks do. Then I started learning about aerated fuel and the damage it can cause to injectors. So I learned how air separators work, (the patents are out there and explain). It's actually fairly simple, but it requires moving quite a bit of fuel. Which leads me to the question, has anyone kept both tanks in an OBS and gone to larger fuel lines? My thoughts on this are to get a second switching valve and plumb them in parallel for both tanks, or setup a transfer pump and only actually feed from one tank.

There is a moderator on another form who says the stock 3/8" line is not large enough for 238/80s but doesn't really support his assertion. Is that true? My FPR has AN10 inlet and outlet, and AN6 return. I wouldn't mind running larger lines, I just need to figure out how to keep using both tanks.

I know I could switch to a larger single tank, but I want to keep my spare tire and both tanks.

Thanks for any help folks!

 

I think you're overthinking this. I haven't read of anyone having an issue with the stock line size. Maybe on a pro-level competition truck it'd require larger lines, but they're probably running a single tank.

 

My Marty's efuel kit came with 1/2" supply line and 3/8 return. This is all after the selector valve, and yes I'm running 2 tanks for now. In the future I might go to just a 38 in the rear.

 

All I will say is my stock lines,gsl392,aeromotive reg and 250/200 never moved my incab fuel pressure gauge. Maybe on an all out crazy tune but I have never had mine all the way up. Heck my tow time is pretty stupid @50lbs..
The trans checked out on my#4 tune.

 

So, the reason I'm looking into this is for air separation. From what I've read, somewhere around 1/2 the fuel has to be returned to eliminate all the air. I'll be setting up a test bench sometime soon. Been getting busy with work.

Interesting. I guess it would reduce restrictions even if it's after the switching valve.

Thanks for that, I kinda felt like that assertion was not true otherwise it would have been more talked about.

Anyone know how to calculate minimum and maximum fuel consumption for a given injector. I've heard 238cc is actually 238cc per minute, which times eight would be about 1,900cc per minute. Is that right?

 

air removal is needed when using a mechanical pump as the fuel will cavitate with enough suction

 

To my knowledge, the fuel sloshing in the tank alone is enough to introduce air. Pressurizing air to ~20k psi and sending it through the small injector holes erodes the holes. I'm going to do this primarily as protection for my injectors. When I get it all sorted I'll share some videos. Sadly work has kept pushing this project back.