If I am not mistaken it isn't really any different. I've seen some people run their rails like that even with a dual feed. I've been under the impression that a dual rail is "better", but I am not so sure that is really the case.

You can arrange how a rail gets fuel however you feel like it so yes, you can run dual pumps to a single feed rail.

Alex

 

I think one of the sp systems only feeds one end, but I could be mistaken....where is the return on your rail? it is definitely possible, lots of folks run 2 y's in their system, with a single feed you'll only need one....

 

The feed is one side and the return is on the opposite side.

What would be the best way to run lines to the rail from the pumps? What size for the feed and the return?

 

It is possible to run dual pums to a single feed line. No real reason to though. I haven't heard of a single feed rail that will flow much over 7-800 hp. That's still in reach of a single pump. Very close to maxing it out, but close.

As for the size lines, I would go -8 feed, and -6 return. Pretty standard for most of what I've seen. I know that's what mine are. Then again mine is dual feed center return.

 

That is good to know. I haven't see a lot of people running the stock pump past 600 hp so that's why I was opting to go with dual pumps. Would it be feasible for me to run a single stock fuel pump with -8 from the tank to the rail and use the stock return? Should this be able to support 7-800 hp?

run a y in the tank and a -8 all the way to the front of the rail...then put your regulator on the return line...use your stock return

I just went over supratt400hp's fuel page and saw how he used a y-block in the tank with his dual pumps. I'll probably go that route if I decide to still go with dual pumps.

 

run a y in the tank and a -8 all the way to the front of the rail...then put your regulator on the return line...use your stock return

 

It will work, the idea is that with a center return you have more consistant fuel pressure to each injector with the side feed rail.

 

No, stock pump will not support 7-800 WHP. I don't know what in-tank pump that will. Maybe Mike can let us know as I'm sure a lot more people would be using them.

-8 will support your power goals, IMO you shouldn't even try to reach those numbers with one pump safely.

Alex

 

sign me up for one of those as well

 

Hell people wouldn't be throwing 3 and 4 walboros in their tanks if it existed. Maybe he means a high altitude dyno corrected 800hp. :bigthumb:

Alex

 

I personally wouldn't use a single Denso much past 600, but I have heard of cases where they have tickled 700 at the wheels.

I was researching them a couple months ago when I had my fuel system built. I was just saying I don't know if I'd still use the single feed rail with a dual Denso setup. IMO if you're spending the money to have your fuel system built, spend the extra few hundred to get a dual feed rail.

 

I am pretty sure a dual feed rail costs the same as a single feed rail. It just has one extra hole tapped into it (center). How many feeds it has doesn't dictate how much power it can support. It's the size of the rail internally.

 

Well, the reason I'm going with the single feed rail is because I'm getting it at half the price of a dual feed. I'm going to try it out and take the boost up incrementally and look at the A/Fs and injector duty % at each level.

Here is my planned setup:

-1000cc injectors
-Dual Denso pumps (unswitched, running full time)
-Y-block in the tank
-8 AN from the tank to -8 AN inline fuel filter
-8 AN from fuel filter to -8 AN fuel rail
-Areomotive FPR
-Stock return
-MAP ECU for fuel control

Thanks for everyone's input so far.

 

Well, the reason I'm going with the single feed rail is because I'm getting it at half the price of a dual feed. I'm going to try it out and take the boost up incrementally and look at the A/Fs and injector duty % at each level.

Here is my planned setup:

-1000cc injectors
-Dual Denso pumps (unswitched, running full time)
-Y-block in the tank
-8AN from the tank to -8AN rail
-Areomotive FPR
-Stock return
-MAP ECU for fuel control

Thanks for everyone's input so far.

you will be fine.....why look at injector duty cycle? are you worried about maxing out 1000's?

 

I don't think I will but once I start getting close to 30 PSI, I'm not sure how much those injectors are going to be working. Guess I'm just worrying too much.

 

The theoretical advantage of the dual feed rail is taht there would be a more uniform distribution of fuel among cylinders, since fluid pressure losses would be less.

I know that the big dogs do not worry about that stuff for about 700 HP or less, but do not know at what point they would worry for bigger injectors - and power levels.

If there is a problem, I do not think that injector duty cycle would reveal it; these things look at aggregate parameters. If something goes wrong, one would expect that the cylinders on the return side of the rail would be the lean ones.

I would think that if there is a problem, detonation would come up, and the ECU would pull timing, and that might be a better parameter to monitor.

That much said, I think that we all are going on reasonable, yet empirically untested theories.

All the best