We upgrade the fuel pump to a Deatschwerks DW400 and fix the FD RX-7’s notorious fuel starvation issue by making a surge tank and using a DW100 lift pump paired to a Holley HydraMat mounted in the tank.
FD RX-7s are notorious for fuel starvation issues on road courses when the fuel level drops below ¾ of a tank, and especially when the fuel is below ½ a tank. To solve this problem, we created a surge tank out of the stock plastic fuel pump baffle by using the GarageAlpha Hyper Fuel Baffle/Surge Tank Cover, a Holley HydraMat, Deatschwerks DW100 lift pump, and a few CV100 fuel cell surge tank check valves.
We removed the rear truck mat to reveal the fuel hat access panel on the left side of the car.
With the access panel removed, we can see the top of the OEM fuel hat.
We disconnected the electrical connector, fuel feed, return, and two fuel tank vent lines and removed the 8 Phillips head screws to be able to remove the fuel hat.
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!