On to my next project. Installing a Holley Hydramat to hopefully cure my 1/2 tank or less high "G" corners when on track.
The stock fuel/pump/tank is a convoluted plumbing nightmare, only when you have a return style system I guess. Normal driving does not effect the operation of the car, just being a little over zealous in corners on track. I could always keep it full, but why? I'm going to attempt this and then test it in a few weeks at my first event of the year, so here goes...
The plastic sump shown holds the fuel pump and sender and snaps into the holder, which is fused into the tank bottom. In other words, it holds the pump and is held in place by the "top cover" of the sump. You can see where the top outlet goes to both the pump and by-pass tube. The by-pass just goes back into the tank and also to the inlet side via another "T" shown below. I do need the sump assy. because it holds the fuel sending unit and pump secure.
The following is just a shot of the sump and the small flapper inlet to the sump from the tank, which really seems useless. Notice the by-pass & input tube don't go to the top of the sump.
This is a side shot of the sump showing the two tubes and the "T" connection between them, that connect to the inlet screen sock as well. All of this can/could get pulled back into the sump. I have also marked with dash lines where I'm going to remove a section of the sump so the Holley Hydramat will be able to go into the tank itself. I'm not going to need the sump per say, as the Hydramat will be the new sump (I hope). I can't just cut up the sump due to it needing to hold the pump and sender, so I have to be surgical about it.
This is showing the "T" connection on the top cover that is needed to connect the pump and by-pass, and you can see the two small holes for screws that keep this secure to the pump and "sandwhiches" it from the cover to the sump bottom. I have to make sure the Hydramat and cover tightly keep the pump in place.
Now that that's clear as mud, my question is: Why couldn't I just eliminate (basically plug), the by-pass tube? Or, it can stay and just dump back to the tank as well. Both tubes are gusseted to the side so that may be a better way. From the research I've done, the returnless system is regulated by the PCM and FPDM for voltage supplied to the pump and therefore needed some sort of by-pass just in case, which I don't need anymore due to the return style system now. Basically need the setup to hold the pump and Hydramat. If I make a mess, I'll have to fix that too!