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Need a detailed explanation of RX8 fuel system?

Old 01-12-2019, 04:21 AM
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Need a detailed explanation of RX8 fuel system?

Hello everyone,
I recently bought a rx8 model 2003, and the previous owner has messed with the fuel system which includes issues like:
.getting no fuel indication on speedometer (if there is fuel or not the reserve light is always on and the indication needle is always on empty)
.there is fuel pump wiring on the inside of the tank going to the other side of the tank to run a secondary pump that pumps fuel to the passenger side of the tank.
.the fuel pump assembly on the pessenger side is missing.
.on the driver side of the tank the fuel pump is lying horizontal on the floor of the tank and the assembly portion has a gauge sort of think that has 2 wires going to the inside of the tank.
.there is a return system of sort the excess fuel always go to the driver side of the tank.

What i want to acheive here is to restore all of this mess to company setup!

If someone here can give me detailed information on how the company system is and how it looks that would be highly appreciated!
If someone could add in pictures of the company setup would be great.

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Old 01-12-2019, 08:40 AM
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Stock fuel system is returnless with a pump in the left side of a saddle tank and a venturi pickup in the right side tank that uses the overflow from the fuel pump to activate. There are 2 fuel level in each side of the tank that the ECU uses to calculate the fuel level.
There should be a pump assembly in the left tank and a pickup in the right tank... and a black plastic fuel line that connects them and attaches to the pump unit and too the siphon pickup

It sounds like that is all gone.... the easiest thing would likely be to buy a complete tank setup from a wreck... otherwise you will have a difficult time sourcing all of the missing parts.
You may still need to replace the pump unit in a salvage tank though as the filter is integrated into the unit and is not replaceable
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Old 01-12-2019, 08:39 PM
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google mazda RX8 service repair manual may be there
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