Neutron

iTrader: (10)

I just recently had my fuel tank professionally cleaned and upon reinstalling the tank, I was only able to fill up 11 gallons of fuel before pressure would literally shoot fuel through the fill neck. Turns out there was some masking tape inside the rear fill vent nipple from when they re-coated the outside of the tank. Either way I drove the car in this state for about a month with Dual bosh 044’s, E85, and well over 500whp. I knew that the factory fuel tank was horribly baffled but didn’t realize how bad till I was limited to 11 gallons of fuel at a time. I would normally fill up and refill at half a tank.

If you have a big fuel system, are making a decent amount of power, and do any sort of “spirited” driving you are literally driving a ticking time bomb once you get below half a tank!

Since I live in Arizona and do not have AC, driving the Rx7 was going to be limited for a few months. This gave me the perfect opportunity to have the car down and hopefully come up with a solution. Since this is a street car that I do enjoy driving around town, I was not going to have anything fuel related items inside the car.

Here is what I came up with. Hopefully it works out for me.

Parts:
• Integrated Engineering Aluminum Submerged Dual 044 Billet Surge Tank with corrosive fuel protective coating.
• Custom .190” aluminum mounting plate.
• 3 Bosch 044 fuel pumps.
• 2 x Bosch 044 weather proof electrical wiring boots.
• Fuel Labs 75 Micron stainless fuel sock with custom fitting to attach to Bosch 044 pump in the factory tank.
• -6 stainless feed/return from factory tank to surge tank.
• -6 E85 safe check valve in-between factory tank and surge tank.
• Dual Bosch 044 log manifold fuel rail to -8 out. This allows me to use the Bosch 044 check valves.
• Fuel Labs big -8 in/out 6 micron E85 safe fiberglass fuel filter.
• -8 stainless feed from surge tank.
• -8 return to -6 just before entering the surge tank.

RENESISFD

iTrader: (13)

Any updates on the performance of this setup? I am currently installing the same setup in my FD.

Any problem with fuel temps being too high?

Neutron

iTrader: (10)

So far no issues at all. It has performed exactly as I envisioned solving all fuel related issues when the tank is low on fuel. I've actually done full throttle pulls at 23psi with the low fuel warning light on with no drop in fuel pressure and rock solid A/F.

I currently am not using the factory fuel temp sensor so I honestly do not know what the fuel temps are. I am in the process of switching to an AEM and integrating a Flex Fuel sensor so I will get the fuel temp reading back. I would guess I would have to worry about the fuel being to cold rather the to warm though.

From the parts list I mentioned the only thing that turned out to be unnecessary was the check valve between the surge tank and fuel tank. Completely unnecessary.