70 Cuda fuel return line
 

Hi guy's - new to this forum. Appreciate any help anyone has to offer.

I have a 70 Cuda with a 340/410 Stroker with a 6 pack setup producing 550+ horses. I have a dead head Holley black electric fuel pump with a 3/8" fuel line that does not keep up with the HP. I am currently installing 1/2" fuel feed & return lines with a stock gas tank. I am having a problem finding a sending unit that can handle a 1/2" return line for a bypass regulator. All that is available, that I can find, is a 1/2" feed line with a 1/4" return/vapor line.

Does anyone know of a solution to the 1/2" return without having to install a fuel cell. I have to keep the stock gas tank intact. I am up a creek without a paddle right now.

Welcome to the forum!! Just my .02 worth,but I don't think you need the 1/2" return line.A 1/4" return line will be fine. The holley black pump with the 3/8" fuel line should have been fine,do you have a pressure guage you can see while driving?
If you still want the 1/2" return just cut off the 1/4" nipple off the sending unit,and silver solder in a 1/2" fitting.
john

Thanks for your help John,

I had purcahse a 1/2" sending unit and cut out the 1/4" return and had a 1/2" return tube made to replace it. I was not successful with soldiering it in place - soldier kept running off the round face plate and never took. I used silver sodier and tryed multiple wattage soldiering irons and came down to trying a propane torch. Flux was used in all attemps and silver soldier - I am obviously not doing something right.

I have recently discovered that the return line can be located in the filler neck of the fuel tank. A little luck and a good weld job with an AN bulk head fitting we could be in bussiness.

I hope - what do you think?

More help welcome>>>>>>>>>>>>>thanks:swinging:

Try "tinning" the plate first. With the tube out solder onto the plate, will take less heat. The same could be done to the tube. Now when the two pieces are joined they have been presoldered or tinned and the final soldering should flow into the joint. If silvering get a flux specifically for that type of solder, very important for a good job. Silver is typically more difficult and will take a bit more heat.
I'm not to keen on the filler neck idea. I have seen some add a nipple like a vent line to the top front of the tank, and I like the idea of a down tube into the liquid rather than spraying into the tank.

Pretty sure it's not an issue with the pump or line. I have a 500hp 360/410, running a holley red pump with 3/8 line, my regulator is set at 7 psi and my guage never drops below 6.

If the pump is mounted wrong it won't push as much, could also be a restrictive filter or something.

You may need 1/2" feed from tank to pump, but 3/8" from there should not be an issue.