OK so im gathering all the parts to switch my 350 TBI to TPI this summer and im really starting to read into it as my next project after my suspension build. I have read the Tech article numerous times and also searched many times. Im clear on almost everything except the fuel line issue. It says you need to replace the lines to metal ones. Im assuming this means both the rubber lines that come off my pump at the tank and the rubber lines that go from my TB to my Metal hard lines in the engine bay. However, through searching i have come up with conflicting answers. Some say that you do, some say that you dont, others say just swap the send lines, they must be rated for 75psi. Which one is it?

Which lines need to be swapped?

And with what exactly if they need to be swapped, i would probably buy some braided line if they need to be swapped is the send line coming off the tank not rubber like on a TBI car?

My car is a 1991 RS by the way.

 

i dont see how you would be able to get rid of the rubber lines. they almost have to be there for flexability reasons when your suspension is going up and down and when your engine torques. have you tried looking up the part numbers for the fuel lines between a tbi and tpi? i would assume they would use the hard lines and maybe the rubbers on the back but would have to have different rubber in the front to connect from tpi to tbi. but i may be wrong. looking at my classic industries mag they have it listed like this for fuel lines
1982-86 4 &6 cylinder (LH) 3/8" line #FGL8201
1982-92 V8 with 3/8" line #FGL8202
1982-92 all with (RH) 3/8" line FGL8203
1985-92 6 cylinder with 3/8" LH forward line only

They make no distiction between TPI and TBI. Not for sure what they mean by (RH) but it doesnt seem like they show any difference for TPI lines. they dont show the rubber lines, so i am not for sure if there was a difference between them. maybe that is where the difference between the 2 are. maybe higher rated rubber lines for the TPI and the same hard lines.

Hope this helps.

 

Thats exactly what i was thinking, the articles and searches say to replace them, but other than braided or a higher rated rubber line i cant see how it would come stock, nor does anyone who has done the swap state what to replace it with all the Part #'s that i have seen are the same.....

 

there are 2 short steel lines that come from the intake on tpi cars and tbi cars.
They are diff. between the 2 and also the rubber lines from the framerail are the same.
I have the parts you need if switching to tpi from tbi.
I see you're in Fl. if you want these pieces for free, pm me and let me know.
I will be at the sumter county fairgrounds this coming sunday for the swapmeet.

 

any idea on the size braided line I would need for my swap? I dont know alot about An sizes.

Im cutting my TBI lines short and going to the TPI intake.

BTW I have a Caprice

 

The metal lines going from the tank to the front do not need to be changed. They're the same.

What needs to be changed are the rubber lines going from the metal fuel lines to the intake manifold and fuel rails.

 

yeah thats what Im saying, so what size line is needed? Are the spectre fuel line and anodized fttings (from pep boys) worth a darn? My dad gets his stuff from Jegs or a Local speed shop.

 

the rubber lines from the frame rail need to mate to the short tpi metal lines on the intake.
When switching a tbi motor to tpi,you will find these short metal lines from the rubber end of the frame rail to the tpi intake very necesarry.
I ran into the same problem on a project car a few years back.
Sorry for the earlier confusion,my mind was wondering last night in the previous comment I made.

 

Okay i get it now, i understood before also from your previous comment, i believe there is metal line, some rubber lines than more metal into the TB, ill let you know once i pick up my intake if it comes with the rubber lines or if ill need them. Im just assuming the TPI lines are rated for higher pressure.