From this angle, we can see the factory fuel tank baffle, and the right half of the fuel tank that has no way for fuel to get to the fuel pump when accelerating and turning left.
We installed a 90-degree Earls fitting and hose to the HydraMat Cross (PN: 16-101).
We wrapped the Deatschwerks DW100 Micro lift pump in Viton Rubber sheet for noise reduction, used a fuel pump inlet adapter to convert the lift pump into an inline fuel pump that can pull fuel from the Hydramat, and used a clamp with a neodium magnet to help secure the lift pump to the steel fuel tank, along with a metal cable tie.
We mounted the HydraMat under the baffle ensuring the sharp edges were covered with rubber to prevent damage. This positioning of the HydraMat will enable the lift pump to pull fuel from any corner of the tank, especially when accelerating when the car needs fuel the most.
In order to turn the plastic fuel pump baffle into an enclosed surge tank, we used the GarageAlpha Hyper Fuel Baffle/Surge Tank Cover.
This surge tank cover has a Viton rubber mat to help seal the cover to the plastic baffle.
We drilled a hole in the surge tank cover and routed the lift pump hose into the new surge tank. The lift pump will now keep the surge tank full as long as there is fuel in the far end of the tank that is in contact with the Hydramat. The cover is held in place with (4) metal zip ties, which helps keep fuel inside the new surge tank when cornering.
With the surge tank cover, DW100 lift pump, and Hydramat securely mounted, we bolted in the upgraded fuel pump hangar and DW400 fuel pump. We now have an in-tank surge tank that should stay full of fuel until the tank is near empty due to the check valves and especially the DW100 lift pump and Holley Hydramat that will keep the surge tank full as it draws from any fuel that sloshes around the tank.
We are really looking forward to testing the effectiveness of this lift pump and surge tank setup when we get the FD RX-7 on the track in the near future. Stay tuned for the next installment of Project FD RX7 Restomod!
SOURCES
DEATCHWERKS
RADIUM ENGINEERING
EARLS PERFORMANCE PLUMBING
HOLLEY PERFORMANCE
BILLY JOHNSON RACING
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!