IMOP it is a peice for guys looking to get the best fuel supply ( quantity ) they can get . I have no reason to believe it will let you fill your tank with any more fuel and I owned one . It will cure any issues with running at less than 1/4 tank and sucking air though .
Just wondering how true this is/isn't. Not argue or trying to start anything just trying to look at it from a logistics standpoint (which what makes sense in theory does not always pan out in the real world).
The factory has the return go into the bucket where fuel is sucked up through. That would help keep fuel supply at the pickup when acclerating, decellerating, corning, etc.
Our tanks are not baffled (at least I did not see any when I installed my KD pickup) and fuel will "slosh" due to physics. Placing a pickup in the center of the tank is probably the worst place for it (except when the vehicle is stationary and motionless). I believe that is why the factory designed that from the start as a fitting in the bottom of the tank would have been cheaper.
All that being said, if the factory fuel pickup is comprimised or altered, it can lead to issues as the tank is drawn down, or if it's a restriction (size of the openings) then I can see where a large diameter bulkhead with large ID fittings and hose would help (although the inlet of the CP3 is pretty small).
The nice thing about the bulkhead fitting at the bottom of the tank is it is non-mechanical (less chances of a failure or part wearing out as there is no moving parts, hoses, etc.).
It was also mentioned about the slime/gook at the bottom of the tank. I think the slime/gook is from the factory pickup not picking up the stuff from the bottom of the tank and then it accumulates. This fitting would not allow this to happen and that stuff would normally be filtered by the fuel filter. If I were to install this fitting I would drain the tank and clean it prior/after install to prevent the accumulated gunk from even being sent to the filter.
I would think the OEM style would provide better fuel quality until it reaches a point where it loses suction (VERY low fuel levels), whereas the bulkhead would provide good quantity/quality as the tank is full or near full, but as fuel sloshes at low levels it would allow more air to enter the system as there are no baffles or catch cans (this may not be an issue as our fuel systems deal with air fairly well compared to older systems). Yes it will allow you to run your tank lower than OEM but at what cost (fuel quality and air).
Thoughts?