We used the Radium Engineering Electrical Bulkhead Stud Kit for the power and ground wiring for the main fuel pump. These hermetically sealed bulkhead studs are CNC machined from 304 stainless steel, accepts 10-12 AWG wire, and are rated to 30amps each. There’s a special insulating sleeve that prevents panel conduction and galvanic corrosion, while anodized aluminum top locking nuts ensure a reliable connection.
Underneath, the nuts fasten the bulkhead connector to the hat. Another nut will lock the fuel pump wires to the stud.
For the main fuel line, we used an Earl’s 90 degree -8AN Bulkhead Fitting and for the return line, we used an Earl’s 90 degree -6N Bulkhead Fitting.
To pass the remaining 4 wires for the lift pump and factory fuel level sensor through the top hat, we used the Holley 4 Wire Horse Shoe Bulkhead Kit. Leak tested to 80PSI, this 14 gauge 4-wire over-mold is hermetically sealed on the wires and fluorocarbon O-rings seal the over-mold to the fitting for a leak free seal.
For the fuel pump, we chose the 415LPH Deatschwerks DW400. This E85 compatible pump was designed to support up to 1,000hp on gas, 750hp on E85, and have Pulse-Width Modulation (PWM) drivers. For a less efficient and thirsty rotary engine, this pump should theoretically support around 700-800hp on pump gas and 550-600hp on E85.
Backed by a 3-year no-fault warranty, this very quiet pump has a very low amp draw for its flow rating and was apparently developed for an OEM supercar application so it is very proven, reliable, and durable.
The 415LPH DW400 fuel pump is quite stout, beating the 525 LPH rated F90000285 “Hellcat” pump in flow and at a lower amp draw above 80psi. We plan on running a high base fuel pressure, so flow above 80psi is important for our build and makes this clearly the better choice of the two.
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!