Hi to you Cuppa & Bigcol. Thanks so much for your replies. What a great forum. Cuppa, I actually removed the Lift-pump blocked off the filter "IN" and connected a vacuum pump with gauge to the filter "OUT". Noted that the vacuum slowly leaked away. Hence my suspicion re the lift-pump. Interesting though your mentioning of the fuel line from tank to filter. Definitely no leaks visible. I have looked suspiciously at the rubber hoses attached to either end of the tank-to-filter fuel line, but as I said NO visible leaks. Have also thought of the one-way valve, but I often consider the fact that if the manufacturer did not fit it, hence it should not be required.
So if the lift-pump does not cure my problem, I will have to give the fuel line closer attention. Shall see.
Bigcol, yes, well it looks like a factory turbo, all appears to look very original. Now Im learning here Bigcol, is the BOOST, the pressure out from the turbo into the manifold ? I assume so. I take it, the EGT is the exhaust gas temp at the exhaust manifold. I hear some 4x4 people have a BOOST,EGT and other gauges fitted to enable monitoring what the turbo does. I think that sounds like a good idea, if I fitted some gauges to my beast. What are some necessary readings to keep monitoring. I commonly hear BOOST reading and exhaust temperature. Can you give me leg-up here, as to where the gauges are connected to get the various readings.
Now re the intercooler, I take your suggestion on board, thank you. There are different types of intercoolers are there not? Which one is the better? If Im going to go to the trouble of fitting one, I may as well fit a gem.
Anyhow, thanks again for all of your interests and assistance with my dilemma.
Will keep you all posted with my progress.
Roland the WOLF 19/8/2015