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Ok cool.. thanks for helping me figure this out. So you are certain that the section wire from the blue connector to the fuel pump is not the weak spot.
 
Ok my setup is battery in the boot, so its only couple of feet to the pump, using 30amp relay. I have used quite thick wire i would say about 2.5mm diameter. You are right 14gauge should be sufficient.. Info on wires:
http://www.rbeelectronics.com/wtable.htm
 
I was looking through Maplin to find a suitable wire, i found this:
http://www.maplin.co.uk/Module.aspx?ModuleNo=6200&OrderCode=XR59P
What do you think? Or do you know a better one?

On the picture posted by Clive I see that the original wiring (the blue connector to the pump) is used to supply power to the pump. Would this wiring be able to supply close to 30A?

Cool .. i guess we are at the same level...
 
Ok.. the trouble is somehow not enough current is going to my Bosch. I have changed my wires and relays so many times with so many combinations. At one point it worked perfectly, and the car seriously flew.. ok.. well fastest i driven a car.. where the front wheels seem to lift
 
So its getting kind of hard to make the pump work right, cause it needs the current, where as any other pump which doesn\'t need much current will work fine on the same curcuit. But I probably also need to sit and fiddle some more with volt and ammeters to see if there is some weak spot.
 
So might try rewiring from blue connector to pump.. which maybe the causing the issue, as I never changed it   (But may not solve the problem as the connectors may also limit the current)
 
I am not too keen on changing the plate as well..  so if I can\'t get Bosch to work properly.. my backup plan will be the Walbro, wont be a better pump then Bosch.. but hopefully so long at it works

Funny enough I also had starvation issues which confused me for a long time when it used to cut out. After realising this I had to measure the bottom of the tank properly, and take my time and position it low as possible but still with enough gap to suck the fuel.
 
I would also say keep at least half a tank if you are going to drive it hard. Worked for me.
 
I am also considering putting a Walbro instead as I am running less then 400bhp. It wont need the amount of current needed by Bocsh. I would still run the direct circuit through it (close to 13.6V) which will ensure maximum flow

Excellent write up Scott..  I have fitted Bosch pump on my car , and have rewired everything similar to yours.
 
The bit I missed is the wire inside that tank, from the blue connector to the pump. I am guessing this is necessary to get the full current to the pump.
 
Did you have to get wire with any particular insulation, as I am wondering if petrol will deteriorate the rubber over time? If everyone just uses a wire with normal insulation good for taking 30amp, and had no problems, then thats what I will do.

Hello there, as I already have a pfc, any chance you can sell the commander on its own?