Considering installing Holly Snipe efi on my 1972 LS5 454. It requires a fuel return line to tank. Does 454 have a return fuel line or will I need to replace the fuel tank? Thanks for all input.

 

It "should" have the return line
You should be able to feel them run up along the inside of the passenger frame rail and depending on the wheel clearance at the rear you can see them on top of the frame in the rear wheel well and of course if you can see under the fuel pump both are there, you can't really see them at the pump from the top side
M

 

Found it. Thanks

 

If you choose the Stealth Sniper it doesn't need a return line. The In-Tank Module made by Holley also has the Fuel pump, Fuel Pressure Regulator and a new sending unit all in one simple to install part. It even has the Hydra Mat by Holley which is an incredible part by itself.

I have the Stealth Sniper on my Corvette because it doesn't look like a EFI system on my engine. It looks like a double pumper sitting on the intake. Not much of a difference in price and the drop bases for Holley carburetors still work on them. That is not necessarily so for the Plain Sniper.

 

Are you happy with the result? Any problems?

 

I would highly recommend using the Holley Fuel Tank Modules as they work and are easy to install. The entire fuel system for my Stealth Sniper was installed in less than 1/2 hour and it holds pressure way longer than my C4 can. EFIsystempro is the place to call if you are interested. I placed my order on a Monday and had the parts in my hands on Wednesday. They are located in Central Florida so we on the East coast get faster results.

I want to get a piece of the Hydra Mat for my C4 as that model has a history of sucking air when less than 1/4 tank of fuel is left. The Hydra Mat is amazing but unfortunately Expensive. Getting a piece with the Fuel Tank module was a real bonus as that one piece is $187 by itself. The whole Fuel Tank Module cost less than double that. The one I have has a Walbro 255 Lph fuel pump, 58 psi fuel pressure regulator and the new sending unit. They now offer a higher flowing fuel pump if your engine is particularly thirsty. I installed mine from under the Corvette as the 1968 has a hole in the bottom of the tank where the fuel outlet is mounted. When installed you can barely hear the fuel pump running and the Holley ECU controls the operation of the fuel pump. Some nice engineering work on Holley's behalf. And best of all just one fuel line, no return lines needed.

The only negative for me was having to remove the Fuel float from the main parts to get it into the fuel tank more easily. It only uses two screws to secure the float arm so it was not to hard but laying on your back doing it makes it a bit more of a challenge.

 

Interesting. Thanks for the input/

 

i am not real comfortable with 60 psi of fuel in a steel fuel line that is 50 years old and designed to pass fuel at slight negative pressure. if that line gets a leak either from corrosion or vibration-stress, with a carb it will suck air and leave you stuck on the side of the road. same leak with 60 psi of fuel is spraying fuel all over your exhaust. and the car will keep running. many people use a flexible efi rated rubber or braided steel fuel line.

 

Very good point. Thanks

 

I used Earl's EFI fuel line,, and you can use E85 and simular fuels in it if you like without issues.