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Any help appreciated! I have a massive fuel leak from the left hand tank on my series 2 coupe, when I’m driving using the right hand tank. The immersed fuel pumps on both sides have recently been replaced. It takes a while to start leaking, may 10 munites of driving before it starts. It doesn’t leak from that tank when I’m running from it to my knowledge but it doesn’t run very well, ie half power. What is going on???!

I have come up with a theory overnight. I think the right hand tank is pumping straight into the left hand tank, it fills up and spills out the Breather hose. So either the non return valve is stuck open or installed the wrong way around.

Check out the changeover switch too to ensure that it's working as Jaguar intended. Mike.