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Just got my 4.2td injector pump done for the same trip and not much more than that I thought the 3 litre was much cheaper but after having a leaking pump through corner country it wasn't much fun not knowing if we were about to breakdown or not .
I'd get it done but if you want peace of mind go to a specialist diesel injector pump repair shop if you have one nearby and get a second opinion and price .
Cuppa is right if you need towing where you're going it'll cost a damn sight more .