I'm doing the typical upgrades to the stock fuel rails like putting -AN fittings on them. I see that most people tend to keep the crossover tube as sort of a balance tube. I'm wondering if this is necessary in any way or if everything will go fine without using this tube. Also, would taping this line for the fuel pressure gauge have any downsides? Thanks.

 

I think most people still use the crossover on the fuel rail. Thus, the rail is still setup in a simialr fashion as came from the factory. I still run the factory crossover in mine and dont have starvation problems

 

Re-reading the question I see that I wasn't terribly clear. I am running -8AN to each rail and have a -6AN return off of each rail. I've seen some people leave the crossover pipe in there just to equalize pressure between the two rails or something of that nature. I'm just wondering if it's worth it to keep that pipe or if the rails can be indedpendant of each other. Also, if the crossover is retained simply to "balance" the two pipes, would it be an ideal place to put a -4AN fitting to hookup to a gauge?

Thanks for the response tho.

 

Think of it like this, your running fuel to both sides of the fuel regulator right? So everything will balance there. I have thought about doing it this way, but the crossover seems to supply enough fuel. I may just do it anyway.

 

I'm setting up my fuel system based on the manufacturer's recommendations. Basically the way many people have explained it to me so far is that it's better to go overkill on the fuel system than to take any chances.

 

Rather than individual return connections off each rail, I took a single -6AN return off the cross-over pipe. This solution will generally be satisfactory up to about 1,000HP with the stock rails. Over that, the individual return connections appear to be needed. I don't see a whole lot of difference with the cross-over being there or not when you have what becomes two independant rails returning to a single regulator. My fuel pressure sender is on the middle of the passenger side rail.

return line

 

well other then sucking up about four cubic inches of plenumn volum and blocking flow it provide the rest of the "Loop" in the fuel return system. if you look the way the factory sets it up the fuel comes up the passenger side and back the driver side to the regulater