Camaro LT5

[Beechy]

Originally Posted by Stielow

A fuel tank needs room to vent. If not I’ll add an expansion tank. The issue in the summer we pump 70 degree fuel into a car when it is 90 degrees out side. The fuel expands and fills the TooMuch vent. OE ad a dome or expansion area for this. In hot rods we want all the fuel volume we can get.

OEMs have a"dead man" in a fuel tank......basically an inverted pie tin with a pinhole in the top surface.
When you thought you'd filled the tank, air is still trapped in the pie dish void and the fuel nozzle cuts out. The pinhole allows controlled venting to occur, so that when the fuel increases in temperature and volume (now that it's out of the ground), it swells into that void and doesn't puke out the vent lines.
THATS WHY YOU DON'T TOP OFF AFTER THE FIRST CLICK.

TOOmuch vent chamber gives the liquid/air time to settle out and is a great feature........but can't cope with massive west-coast changes in temp out of the ground vs. cooking in 95* ambient.

Aftermarket tanks don't have this feature.
Competing claims to the largest volume compared to the competition?

Carl?