The original fuel pump fitted to the GT-R is good for up to around 300BHP with a good clean filter fitted. Above this power level, it's advisable to replace it with an uprated item. I chose to fit a fuel pump from a Nissan Skyline R33 GT-R, as these are readily available and relatively cheap. Reputedly, the pumps are rated at 195 litres per hour, however I have seen tests showing the pumps can flow over 240 litres per hour at 43 psi with a 13.5 volt supply, easily adequate for over 400BHP.
In order to fit the pump, it is necessary to carry out some very slight modifications to the fuel pump holder. The fuel pump is located under the rear seat cushion on the passenger side of a Right Hand Drive car. There is an access plate held on by 4 screws. After this is removed, the hoses can be removed, then the six screws holding the assembly in the tank, then the pump disconnected and finally the whole pump / fuel level sender lifted from the tank.
Remove the rubber band holding the original pump to the bracket, then pull the pump away from the 'bell' fitting at the top. In order to fit the new pump, the bell has to be cut from the pipe very carefully, to leave just a bare pipe. Take care not to get any swarf in the pipe, and clean it thoroughly. A short peice of high pressure fuel hose is then used to connect the pump back to the original bracket.
Here's the R33 GTR Fuel Pump sitting on 323GT-R fuel pump carrier assembly.
Another shot of the fuel pump on the GT-R carrier.
The wiring connector can be removed from the original pump and fitted to the new one, making sure you have the correct polarity!
Inside the 323GT-R fuel tank, there is a very simple baffle type arrangement where the fuel pump draws from. The return line from the fuel rail also drains into here to minimise fuel surge.
