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Request this part Text us (833) 691-5717Radium Engineering · Part # RAD20-0455-03
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The Radium Engineering fuel surge tank hanger can be used with up to three aftermarket high pressure pumps and 1 lift pump in the stock Mazda FD RX7 fuel tank. The unique integrated 1.85L surge tank completely eliminates fuel starvation. No grinding, bending, or modification of the trunk floor sheet metal is required./p>
A fuel surge tank (FST) is the best solution in preventing fuel starvation. Because the FD RX7 can experience high lateral G-forces, it inherently suffers from fuel slosh. Fortunately, Mazda manufactured a gas tank with a very large bolt flange pattern (similar to the FCST) permitting various upgrading options.
The returning low pressure fuel from the regulator is sent back into the FST keeping it full. A second 24 hole deflector is used in this location further preventing air bubbles and foaming. All of this happens inside the OEM gas tank.

The feed kits use high flowing 8AN fuel lines. A Radium 1/2" fuel feed hose runs from the fuel pump hanger outlet to a Radium Engineering fuel filter secured to the rear subframe. From there a pre-made 8AN PTFE feed line runs all the way to the engine bay where it is up to the user to adapt the 45 degree hose end to their specific fuel system. The fuel lines clear the OEM fuel pump cover and all suspension related parts. No cutting or drilling is required to get the feed line past the fuel tank.
The included Radium Engineering fuel filter assembly mounts to the rear subframe underneath the vehicle using a specifically designed FD RX7 bolt-on billet mount.
The filter is mounted through a Radium Engineering heat exchanger to keep fuel temperatures down.

The feed kits use high flowing 8AN fuel lines. A Radium 1/2' fuel feed hose runs from the fuel pump hanger outlet to a Radium Engineering fuel filter secured to the rear subframe. From there a pre-made 8AN PTFE feed line runs all the way to the engine bay where it is up to the user to adapt the 45 degree hose end to their specific fuel system. The fuel lines clear the OEM fuel pump cover and all suspension related parts. No cutting or drilling is required to get the feed line past the fuel tank.
The included Radium Engineering fuel filter assembly mounts to the rear subframe underneath the vehicle using a specifically designed FD RX7 bolt-on billet mount.
The filter is mounted through a Radium Engineering heat exchanger to keep fuel temperatures down.
To simplify aftermarket AN hose plumbing, the 10AN ORB threaded feed port features a low profile 8AN male fitting and the 8AN ORB threaded return port features a low profile 6AN male fitting. To reconnect the OEM feed and return hoses, barb fittings are also included.
The custom designed stainless electrical studs easily handle the high current demand that compact bulkhead connectors lack. These serviceable connections are properly sealed and impervious to all standard and exotic fuels. Nonconductive acorn nuts are provided to prevent any accidental short circuits. Furthermore, the high quality in-tank wiring is insulated with chemically resistant ETFE. Electrical hardware is included for the fuel pump(s), OEM level sender, and OEM temperature sensor.
Free U.S. standard shipping on qualifying orders $199+. Special order and made-to-order items can't be cancelled or refunded once ordered.
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Free U.S. standard shipping on qualifying orders $199+
Ships from our Buffalo, NY warehouse
750,000+ parts from 500+ brands
We carry 750,000+ parts, so we can probably still get it. Check the spelling, try the part number, or ask us.
Request this part Text us (833) 691-5717