Hi Guys.
The pump is not that bad to replace with pretty much everything in situ as I have had to do it twice over the last three months
Simply put, you remove the oil cooler and the engine bay cross member (if fitted) and the fuel line to the carb.
I cut some wrenches down for the job, but you can get at one of the mounting screws and one of the hose fittings thru the gap you have now made in the bay.
The other fitting and mounting screw you can get at by removing the left engine mount (the one down from the filter and selector valve), this is not a hard job and only takes a few minutes if you go in thru the emergency hatch and the Hull plate under the fuel tank.
You then only need to reverse the procedure, I did a static pressure check on the 2nd pump I installed as the first leaked also and I had to take everything down again (so much for NOS parts !!!)
Only took a couple of hours, was a good time to drain the tank though and generally clean up the fuel system.
The first pump I had was so bad that after a short run and you let it sit, the engine bay was awash in oil and gas and it developed a hug mark of shame on the floor.
Remember the ferret uses a scavenger oil system, so before you drain the contaminated oil you may need to turn if over a few times to get everythin out.
Hope this helps.
Mark Witham
PS Dave Thomas over here identified an awesome electronic pump as a replacement for the mechanical one and I now have one plumbed in to bypass the mechanical one if I get a problem.