So I have looked through all of the topics regarding making a sump for the stock tank, and I am going to post my quick summary of how I think it should work.

1) Remove Stock Tank, clean, soak with water and dish soap, citrus based cleaner, etc for a couple days.

2) Drill 5-10 holes in the bottom of the tank. The majority (all?) of the holes should be at the middle of the tank, towards the rear. Holes are 3/4" to 2" in diameter, the larger the holes, the smaller # of holes.

3) Weld on a triangular shaped (in profile) sump, where the tallest side is towards the rear of the car. Fuel feed and return line is placed on the back wall (facing rear of car.)

Fuel goes through the holes in the bottom of the tank, and goes in to the sump. The sump is semi-enclosed which prevents fuel from easily escaping the sump. Fuel naturally goes in to the sump and stays there under accel, and it hard for the fuel to leave the sump under breaking conditions.

Please correct me if I am wrong.

Is there any special coating that the sump needs, or can I just use stainless sheet metal perhaps 1/8" thick? Is there any science to the length of the tube from the fuel tank to the fuel pump? For the most part I have seen only about 1' between the fuel tank and the pump, can it be longer to allow for the pump to be placed in a more secure location?

Thanks!

Chris Barnes

 

sounds good i prefer to use stainless and keep the pump inlet a little below the fuel level

 

Keep the fuel inlet a little below the return line you mean?

I need to remove the EVAP system to make room for the sump. Is there anything I need to do in this scenario?

I figure that if you keep removing fuel from a sealed system that there would be a vacuum in the fuel tank...

Chris

 

Much easier way:

http://toyotaperformance.com/surge_tank.htm

 

i used a gas tank sealer after i put my sump un to seal up any porosity in the welds probably not needed but for 50 buck i did it anyway and now the tank wont rust on the inside either