How much fuel is being returned to the tank while motor is running? The reason I am asking is because I am going with the in tank pump which has that little tray on the bottom and my fuel return will also be dumping into that tray. With no baffels in my el camino I am starving the pump on grades and turns along with takeoff.

So take the rated output of your pump and subtract what the engine actually is using. That is what is returned to the tank.

For normal driving that is most of the fuel pumped.

Thanks Steve,
So as long as the pump is running I will have fuel being dumped back into the tray so I should not have any starvation issues. :yes:

Since this is a new tank i'm going to install would it be wise to cut it open and weld in baffels also or is that a waste of time.:confused:

I would not go so far as to say you will have no starvation issues using a tray solution. A search could turn up some discussion of the Spectra EFI tanks for our cars which use a simple tray solution. These tanks can suffer starvation issues even with their tray. Much of it comes down to your own use and expectations.

Personally, as I have said many times on TC, I am a very big believer in the surge tank concept to prevent starvation issues. There are two general forms of surge tank design: external surge tanks with two electric fuel pumps and internal fuel pump modules with one electric fuel pump and one jet/siphon fuel pump. You can find a pictorial here on TC that I put up of my installation of an AC Delco MU-2021 fuel pump module into a '68 El Camino tank. This module was OEM for heavy duty F250/F350/F450 Ford pickup trucks running 5.4L gas engines, so it has a decent output. It also has a simple flat bolt on sender lid and flexible location of module relative to sender lid. Positive attributes for a garage fabrication :yes: The main limitation on this fuel pump module is output and feeding higher horsepower engines. I have not made the full jump to EFI to actually use the pump, but if output is insufficient I may upgrade the internal pump to a high pressure 255 LPH pump for my small rat motor.

As an interesting note, after a lot of time and trials Carl Casanova is working with Rick's Tanks and offerring fuel pump module solutions under (I think) the name "VaporWorks".

Just looked up VaporWorks and saw the design of the mutipul pickups. They go to the corners of the tank.
Doesn't look to be to bad to modify my setup for the extra pickups.
I Got my new tank and pump from TANKS INC.
Right now I am using a stock tank with the stock sending unit and a inline pump suspended from the fuel line and a return line teed to the vent tube. This works as long as I don't get down to 1/4 of a tank of gas. Been running like that for about 6 years and now it's time to fix the problem.
While I am at it I will be adding another vent to the tank Because when I park on an incline nose down the gas gets pushed out the vent from expanshion on hot days.

Yeah tank venting can be interesting... since I have a '68 I have a few very easy bolt in options. Which is why I put in a '71 tank with the evaporative control system venting.

If you are running a fairly stock SBC you could probably get by with a module as I have. This does not require multiple pickups like the VaporWorks deal. I originally found the concept when looking underneath a Ford Taurus. Their tank is wide and flat like ours, just perfect for sloshing gas around in there. The module provides a reservoir of fuel and a self-priming pump to refill the reservoir. That is why I am such an advocate for the module type solution.

Another factor in favor of the module is the fuel level inside the module can actually be higher than in the rest of the tank. You don't get that with a tray solution.