Feul injection return line

Ricky B

Ricky B

Wiiide Open
Joined
Mar 20, 2005
Location
LKN - Tha Dirty Mo (Mooresville, NC)
I got the holley projection kit im bout to put on my ford (400) and I need to do a return line from the throttle body to the tank. Do I just drill a hole in the tank tap it and put a fiting in for a hose? I realize I'd need to clean it out real good to get the shavings, just wondering if it reall mattered where in the gas tank i drilled the hole. I was thinking I need to get it away from the sending unit as much as possible so the returning gas splashing into the tank won't mess with with my gas guage float.
Thanks
 
You could prob. pull the sending unit out and drill the top of the unit??
 
I'd run a tube down to near the bottom of the tank to minimize the amount of fuel just splashing in there. But basically, yeah.
 
I'd run a tube down to near the bottom of the tank to minimize the amount of fuel just splashing in there. But basically, yeah.
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Aight cool, kinda dumb question though but if I drill the hole at the bottom what keeps the gas from running out into the return line when the motors off? just the gravity at the line where it starts to arch up to the motor?
 
jrraw23 said:
Aight cool, kinda dumb question though but if I drill the hole at the bottom what keeps the gas from running out into the return line when the motors off? just the gravity at the line where it starts to arch up to the motor?
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yep, unless you put a check valve in. What's the concern?

Are you sure there's not a fitting for return line on the tank already?
 
jrraw23 said:
ahhh, duh thanks

but yea the exsisting sending unit does not have a return and pretty sure there's not one on the tank.
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you might want to look at a later model sending unit that had a vacuum canister. you can use that port as the return line
 
hmmm good thought. I know the projection kit comes with its own feul pump (engine has a mechanical pump on it now) so all I really need is like two ports on the tank really, plus the gas guage float. probably be cheaper to just put my own new port on though than getting a new sending unit

If i do run a tube to the bottom of the tank to eliminate splashage from the return do i just use normal feul injection line? Just wondering if it would deteriorate the ouside of the hose being in gas all the time.
 
jrraw23 said:
hmmm good thought. I know the projection kit comes with its own feul pump (engine has a mechanical pump on it now) so all I really need is like two ports on the tank really, plus the gas guage float. probably be cheaper to just put my own new port on though than getting a new sending unit

If i do run a tube to the bottom of the tank to eliminate splashage from the return do i just use normal feul injection line? Just wondering if it would deteriorate the ouside of the hose being in gas all the time.
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There is no pressure on the return so regular hose will do. if you are running a external pump you could just run the return back to the input of the fuel pump. There is no reason that is has to go back in to the tank. I just did the same thing on my Dodge CTD with my WVO conversion. since my return oil was allready heated I did not want wast the heated oil buy putting it back into the tank.
 
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