ScottEwine

I am making progress on the '73 project I bought (Operation Code-name: Norman Borlaug) - the differential is in, most of the suspension is on and I am starting to install the brake lines. I am planning on putting an LS3/6-speed in it (perhaps this one?: https://www.ebay.com/itm/2010-Camaro...-/192584895226 ). The car came with new fuel lines, both from the tank to the pump and the LH and RH vapor return lines. Can these be used with an LS conversion? I know I will need a higher pressure pump in the tank, but can I use these lines to get the fuel from the tank and for a return line?

Scott

ignatz

The little bit of research I did on this suggested that the lines are sized to support the horsepower of the car. I believe there are online calculators that will tell you how to size the line. As I remember 3/8" was pretty good and I haven't had any prob's with a 500 HP motor and the stock lines.

71 Vert LS1

If you use a C5 FFR you only need a short return line from the FFR back to the tank. The return line is 5/16". I've used -6 or 3/8" a number of times. Couple of LS swaps were 450-480 rwhp and ran well with -6 line.

bluegtp

I rerouted mine to the driver side but stayed with a -6 (3/8) for my ceate 525 ls3. I haven't gotten it on the street yet but it runs just fine.

cardo0

The fuel lines of an LS motor should be the same 3/8" supply but the return line i expect is larger 5/6" rather than the 1/4" size your CELL has. I don't expect fuel delivery will be a problem since your LS pump will be much higher pressure and produce much greater flowrate. Possibly the return could be more restrictive and generate higher back pressure but I don't expect that. The real problem is you now need higher pressure flex portions of fuel lines.
After you have resolved that you need to consider tank venting and vapor control. mobird has an active thread on those and you may want to follow it closely.

Good luck.

71 Vert LS1

The LS engines need 58 psi at the fuel rail. If your new frame uses a C3 tank I would look into Tanks Inc. EFI tank. I'm using one on my 68 C10 LS1 swap and it has worked well. It's baffled and you can order it with a 255 pump as I did or if higher horse power a 340 pump. Comes with a fuel level sender. My 68 C10 chassis dynoed at 380 rwhp so about 450-460 hp at the crank and with -6 fuel line no signs of running out of fuel. My combo is a LS1/T56 with AFR heads and a small cam. Very easy to drive but still plenty quick with 4:10 gears.

ScottEwine

I came across this excellent post and I think I will proceed with a plan along these lines: https://www.corvetteforum.com/forums...post1594986249

71yellow454

I used the Tanks INC with the Walbro fuel pump the corvette filter regualtor with quik disconnects on my 73.

cardo0

Scott its difficult to help you without knowing what your going to use for fuel injection or carburetor. I think we are all guessing fuel injection but you need to confirm that and what model EFI. You wanted to use the stock fuel lines but going to what? From what fuel pump? I say this because I see some bad designs posted here. We need to know what you plan to use to suggest something that will work for you.

ScottEwine

Thanks,

The plan is to install a stock 2014 Camaro SS LS3/TR-6060. I was just looking at the parts I got as part of this project and I will need a new tank, but I have a brand new sending unit and brand new fuel lines, so I think I will use this as a starting point:

https://www.corvetteforum.com/forums...post1594986249

Scott

ScottEwine

I could us an OEM style tank and sending unit (that mounts on the underside) if I retrofit the Walbro pump, correct?

ScottEwine

And just to clarify, it seems I would need to mount the fuel pump externally for this to work since there is no easy way to get the power to a pump in the tank.

Garys 68

I used an external walbro. It actually works pretty well with the tall corvette tank, no starvation issues until it's very low.
But if I were to do it again, I would go with an intank pump, the fuel cools the pump.
Your current line is fine as far as pressure, but since it's non-seamless, you'll need to make inverted flare connectors on the ends, then adapt them to the flexible line.
Again, if I were to do another, I would use OEM style plastic line, nylon fittings.
With an f body intank pump, you wont need your return line. With external, you'll just need a short, low pressure line from the rear mounted regulator to the tank. Only trucks had a fuel rail mounted regulator/return.

ignatz

Just a comment on otherwise good advice ... I would put both lines in, regardless of what you think now ... you never know

bazza77

I used the vetteworks set -up . only because tanks inc . wasn't around then. http://www.vetteworksonline.net/cata...products_id=89




I also made a new line down the left side for fuel delivery , I actually bought new lines for a commodore utility and re-bent them to fit so I ended up with the GM connectors for the inline fuel filter and the standard GM $$$ fuel flexi line to the engine .
I also put a new 3/8 fuel line in the original position in case I needed to upgrade the system later (big return line )