My car (stage 3 saff.) is running lean over 4500 rpm in 4th and 5th gears

STU from MSD thinks it may be my intercooler (has a small hole) or wrong fuel tank ie. non ford item. Trying to rule out the fuel tank.

What i want to know is how do i tell if it is the right one ?

Would the worng tank cause my car to run lean?


The tank is silver. Are ford tanks not black?

Wheres the cheapest place to get a proper ford tank if i need one ?