I was told once before that if you used a smaller line for a return than what was stock for a TPI system you would cause too much back pressure and end up causing a fire in the engine, Im begining to think that this was a load of but at the time I didnt want to chance it so I made my own fuel lines and am now thinking that they look terrible plus all the bends are creating restriction.
This is what I want to know...
Can I use the stock fuel lines fora Monte carlo 3/8 feed, 1/4 return?
Also if so..
were there any TPI's that had the fuel lines come into the engine on the pass side? I thought certain year corvettes did but Im not sure since this is the side that the fuel system is ran stock.
:hail: to anyone who can help me!
thanks
Jack

 

Dont know about a fire in the engine but a too small return will burn out the pump. I would get a second 3/8 Monte feed line and use both 3/8 lines for the fuel injection. I used the stock Trans Am lines "adjusted" to fit the G-body frame and a Gran National tank (190 lpr pump) with #6 braided line to connect the two. Using the stock hoses front to connect to the rails. Future mods will require larger lines... You can see the fuel lines in the pic. Hope this helps, Bob

 

HOLA CHIT MAN !! that looks great, thats not in a 3rd gen is it? I may be wrong but from the frame that you can see it looks identical to mine. Did you run the #6 line all the way to the tank or just to the fuel lines?
thanks again

 

hehe, thanks..yeah its a 80 Malibu coupe. its all factory F-body fuel lines back to near the tank, then braided to the top of the Buick GN tank.

 

I installed braided fuel hoses in my 86 Vette because my stock ones rusted out and no one had replacements for it.

I used the -6 size hoses and AN fittings and bought the accel adaptors to connect -6 line to a 3/8 GM saginaw fitting.

Even though I connected my lines to the fuel filter and return junction up front near the back of the motor,that accel kit was also for installng braided hoses directly to the fuel rail.My filter and junction-TO- the stock fuel rail lines were still good so I didnt have to replace them.Just from nder the car back to the tank.Same sizes as the fuel rail themselves if needed.

On my TPI,The feed line was 3/8 but the return line was 7/16 size saginaw.I installed a later model sending unit at the tank which had BOTH 3/8 size return and feed and was able to use the -6AN lines at both ends.Seems GM switched to 3/8 hose sizes for both lines n later cars for some reason.

The accel kit let me plumb a -6 braided hose to a 7/16 return feed line saginaw fitting under the car at the junction.
Have no problems with it and the car runs great and no leaks.

Btw, if you decide on braided hoses,try and ask for teflon or sealed coated hoses...the standard type of braided hoses will vent some gas fumes and can fool you to thinking you have a fuel leak somwhere.I hear they now have a coated hose that wont vent gas..try and see if you can buy that instead so you wont have gas fumes under the car.

My aeroquip fuel line hoses vent a little gas fumes...when I went under the car to smell and inspect for leaks,I could smell some gas fumes,especially with my nose right by the lines.It wasnt major but was normal for these hoses I later found out.
I thought I had a leak and was a nervous wreck trying to find it until a few phone calls told me they will do that sometimes.Hasnt been a problem for over a year now.

Good Luck.