I'm doing a 6.0L swap in my 64 Chevelle from a "03" Hummer, Working on keeping pretty much stock, but I'm told that I can use the Corvette style filter/regulator and cap the return line at the fuel rail. What does a person use to cap the return with and is this a acceptable option? Instead of running a complete return line.

 

If your fuel rails have a existing return line u need to use it. Do not cap it off. The return style rails have a built in fuel pressure regulator already. (The small round plug with a hose tht goes to the top of intake.)

I would just run a feed to the rails and a return back to the tank. Simple and effective. This way if u ever step up u will have room to grow!

 

I am currently running my LM7 with the return capped off at the return port on the rail. No extra return fuel line to the rear, only a short piece of hose with a clamped bolt to stop the fuel. I'm not sure I will stay with this plan long term because I only recently got the engine to start, idle and accelerate with the vehicle up on jack stands - no actual fuel fuel tank is installed yet, just a small pressurized PVC tank.

This might work long term with my yet to be installed Corvette regulator and my original LM7 regulator at the rail but I'm not sure. There could be too much regulation.

Rick

 

Good grief, this is a car-b-q waiting to happen....... There's 58psi of highly flammable gasoline being stopped by a piece of hose with a bolt in it? No, this is definitely not a long term solution! I wouldn't even do it short term, way too risky, but then I like my cars. Capping off the return is a very lazy way of doing it, if you absolutely have to only run one line then by all means find a returnless rail, they've been around for 14 years and not hard to come by. Capping off a return style rail with a rail mounted regulator might work, but those regulators are known to leak when they go bad, and the engine runs bad so you notice it, if you're bypassing it and it starts to leak, well, its going to just leak gasoline all over your hot engine, and you're back to risking a Chernobyl like scenario, but what the hell, that might be interesting.......

 

Believe me, I have thought about this and what you are suggesting about the risks. But in the end, I had to balance the risks of doing this versus running another length of fuel hose all the way to the tank at the rear. At least with this very, very short length of brand new 300 PSI capable strength of fuel injection hose and fuel injection clamps, I only have one place to inspect for fuel leaks in my mostly non-used return system at the engine. To me, this is better than worrying about an entire length of fuel line exposed to rock and other road damage underneath the vehicle that is tougher to view for leak inspection.

But I may still go with a no kidding Russell fuel injection rail cap assembly (???) from Tanks, Inc but I think I will need to call them - can't find it separately on their web site.

Rick

 

Why not just swap out a retunless truck rail? My 05 flex fuel motor came with one I didnt use (swapped LS1 intake). Or use aftermarket rails.

 

I did not know there was one that would fit my 1999 LM7 intake and injectors. I have been trying to keep my costs down and only a month or so ago finally got the engine running well. This vehicle is still up on jack stands and does not yet move under it own power.

Model year 2005 GM vehicles are returnless? Can you let me know the models, please?

Rick

 

2004+ are returnless. Some of the older returnless 78mm intakes are the same as the return style intakes. So your injectors should fit just fine into a retturnless rail. I have a few sets if interested, Pm me.