LS Swap 70c10 Need help

[ls1nova71]

Originally Posted by Project_70'

also another quick question, on the return side of my system is it pressurized? how would i run it with the stock tank? im running rubber efi hose from my sending unit to my pump then from the pump will be stainless braided line to the feed on the rail and for the return either regular efi hose or braided if it has pressure on that side, any replies would be great thanks.

The return side will have some pressure on it or else the fuel will just be sitting there. The question is how much, and that's determined by how much fuel is being used at any given time, but typically it will b e a very low pressure compared to the feed line.

As for the pump sucking fuel, it can be hit or miss. There's a guy on here right now that I think is suffering from not enough fuel pressure at times, likely due to the pump trying to suck the fuel up the stock sender and then to the pump. When the pump begins to get weak, or doesn't have enough power going to it you may see a lean condition and could get a check engine light. electric fuel pumps are designed to push fuel more effectively than pulling it. I've done it both ways, used the stock sender with a pump mounted under the cab, and a gravity feed to an under cab pump. The gravity feed works much better and I have never had it starve for fuel even when the level gets low, something you will have to contend with, with a stock unbaffled tank. There are pics of both set ups in the build threads in my sig. The rusty green truck is the gravity fed one.