The Deatchwerks DW400 is longer and has a much larger 46mm diameter body than the 39mm 340LPH Aeromotive Stealth fuel pump that was installed in the car.
We used an E85-compatible -8AN hose to connect the DW400 fuel pump to the -8AN 90-degree bulkhead fitting. We made a -6AN in-tank hard line to replicate the original return line that dumps the return fuel right onto the fuel pump.
We wired the pump directly to the 30amp-rated Radium Engineering Electrical Bulkhead Studs. The Holley 4 Wire Hose Shoe Kit uses 14AWG wire which typically have a 15amp-rating, and 17.7amp rating or more for Tefzel wire. We decided to run the low amp DW100 fuel pump power and ground wire along with the 2-wire fuel level signal through the Holley bulkhead wiring fitting.
To isolate the fuel pump from the hat to further reduce noise, we wrapped the DW400 pump in 1/16” Viton sheet (PN: 86075K22) that is compatible with many forms of fuel and alcohol.
After adding a 6-pin DTM connector to the fuel pump wiring, we were done with our fuel pump hangar.
The stock FD RX-7’s fuel tank is short, wide, and long. Needless to say, this shape is far from ideal when it comes to running low on fuel, especially when the fuel pump is located towards the front left of the tank.
When accelerating out of a left-hand corner, fuel will puddle in the back right of the tank, which is the complete opposite side of the tank. The factory baffles (in red) do not do much to keep fuel in the (orange) plastic fuel pickup baffle.
3 comments
Those Radium studs, where have you been all my life?! Damn I need to get those.
This build has included quite a few aspects I will be implementing in mine! Unfortunately the custom surge tank setup is more complex and I will be going with the Radium surge tank as a drop in solution.
It seems like E85 is the main fuel for the car, has Auxillary Injection with Methanol also been considered?
Curious to hear thoughts on the why or why not of AI in this use case.
Some awesome details and information in here, thanks for documenting everything so thoroughly Billy!