Fuel return plumbing question?

Well in my thread posted regarding moving my tanks back and adding toolboxes i already mounted the pass side fuel tank, which no leaves me to now start to connecct all lines to the pass side tank and take off the driver tank to start working on it as well.

heres my issue regarding the feed line i have none pretty simple i just needed to extend line a couple more feet and connect to other tanks. NOW my issue is the RETURN line on the driver side tank it had a bung a the top of the tank for the return line BUT my PASS side new tank doesnt have a bung it just has the sump section on bottom of tank with the 4 half inch ports on the bottom one of these being for the feed line.
MY QUESTION is can i run the return line to one of these port on the bottom of the tank which would be below the fuel level or would i be able to maybe tee it off of the FEED line? this is only a temp fix until i can remount the driver side tank which has the port on it for the return.

I ask as the newer freightliner tanks have the fittings which hookup to the middle of the tank which then feed from tubes on the inside which go back down to the bottom of tank to pull and dump fuel whcih then in turn with this type of system leave the fuel returning to the bottom of the tank. I just wanted to know if i would have any issues with aeration or pressure or just plain any...i just need to get her hooked up to start pulling fuel out of the new tank so thati cna get ot working on the driver side tank. Doesthe return line on diesel mechanical system need to be plumbed above fuel level line or does it even matter. Hopefully i can just plumb it to one of the bottom three ports of tank for now.

any help with this would be great im trying to get all this done and her running off new pass side tank before i start the week so any help would be great.\


my only other cheap and simple alternative would be to drill and tap a fitting to an old fuel cap i have add a barbed fitting and some 3/8" transmission hose and just drop return fuel in from top of fuel cap. not to bad of a mission for me as i dont have to make new lines and its going to be cheaper plus theres no pressure on that side so a hose a clamps will work. Will Goodyear rubber hitemp transmission hose work well with diesel fuel i know in terms of temps i will be fine but will the diesel fuel mush up the hose and make it soft if i use transmission hose? i like this idea just unsure about hose.

 

perfect thats all i wanted to know... i will run it to the port on bottom of the tank next to the feed line. the rubber hose and clamps idea was just a thought.

 

quick question? what would be the problem of teeing off the supply feed line going to the motor and just adding the return to it, to then avoid having to run an extra line back to the tank? what would be wrong in doing it like this in turn it would be the same as if it was sucking it from bottom of tank just with less the fuel hoses needed. Plus the unburnt fuel will always get used and never need to be drawn back to tank similar to the way older carb systems work with no need for return line.

 

isnt the hot return side of the fuel dumping into the tank thus making the smae fuel thats being pulled from the supply line just as hot as the return side of fuel? What could the temp difference be in 8' more of fuel line????

 

understood but isnt the return line pressureless? sorry for being so hard on this i just want to get down the concept of why not.