XJ6R – Fuel System Finalised

Fuel System Finalised

After some research, discussions, Email and yesterday over the phone with my Nephew who is a car mechanic and has done numerous engine swaps, I have come to the decision to Keep It Simple Stupid or KISS! In essence, I will replace the two internal pumps, one in each tank, with a pick up pipe and then feed the two outlets via a three way valve to a single, high performance pump. The tanks already have their own vents. This is pretty much how a Series 3 XJ6/12 fuel system is designed. I am sure I have the appropriate S2/S3 valves “somewhere” in the garage. It should end up looking something like below:

Fuel system - Anticipated end design
Fuel system – Anticipated end design

Todays tasks

  • Run two new fuel lines from the engine bay back into the boot area
    • The original fuel lines ran down the drivers side. The XJR lines ran down the passenger side. This means I have to find a new route that has some protection from the heat of the exhaust, the potential for damage from the drive line and and of course the ground such as speed bumps etc.
    • The biggest challenge will be getting the lines over the rear suspension cage and into the boot area
  • These two lines will be the fuel out and return lines and will use new copper fuel pipes plus the rubber end pieces from the original fuel lines so they connect into the engine fuel rail as per before.
  • Remove the two internal pumps from the two XJ6 tanks and make up a pick up pipe for each tank that will collect the fuel from the lowest area of each tank.
  • Each of those pipes will go via the original three way Switch Over Valve to a new high performance pump.
  • The outlet of the new pump will go to a filter
    • The fuel filter will be the the standard XJR filter (which I have a couple of new ones already)
  • Then the fuel out line will connect to the filter on onto the engine bay
  • The return lines will go back to the appropriate tank via the original Switch Over Valves.

“Simples” 🙂

Thanks to James G. and Richard B. for their knowledgable input.

I’ll post the progress as soon as it is done.

Pipe Installation


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