I seen a lot of things in my time but today was the best i have seen it has nothing to with lorries but a Case digger ,my Italian pal came today to dig a trench after 45 minutes the engine stops he gets out of the cab goes to the outside tap for water i thought the old gal must be getting hot 30c here today so i went to see and low and behold he is pouring 5 gallon of cold water over the fuel pump i asked what was he doing he replied small problem then some very fast Italian words another 5 gallon of water 5 minutes later starts straight away he did this every 45 minutes still do not know what the problem was something to do with arm waving and cursing in Italian
I have seen this done on a number of times, when the engine is usually stopped and wont re-start
The fault is the rotary fuel pump becoming worn and when hot will not function correctly
So putting cold water on contracts the hot metal body of the pump
or is it just adding Holy Water
Back in 1975 I travelled across The Sahara Desert with another six mates, a diesel Landrover and a petrol Ford Transit. After two weeks the Transit kept breaking down due to fuel starvation, anytime after 9 a.m. we could only drive for about twenty minutes, then we had to wait half an hour and then it would be O.K. for another twenty minutes or so. One of the guys travelling with us called Pete had just given up his job working for M.I.R.A. which was the Motor Industry Research Association and he happened to have a B.sc in vehicle engineering. After a couple of hours of feeling really {z.b.} off Pete came up with the idea of wrapping bandages around the fuel pump and some of the fuel lines and then wetting the bandages. Being desperate to try anything we decided to give it a go and much to my surprise it worked until the bandages dried out about an hour later.
The moral of the story, always keep a first aid kit in your vehicle as you just never know when you might need it 
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Regards Steve.
I recall my brother in law years ago had a vauxhall viva which kept cutting out when in traffiic in very hot weather eventually he found a fuel pipe ran near the exhaust manifold and the petrol must have been evaporating and starving the carb easily fixed but it frustrated him for a long while, he was a docker in the old london docks and then at tilbury so I suppose a few old drivers on here will say good job I know my father would if he were still around he had no time for dockers years ago all that time queing I suppose, fredm
Thanks for the replies we learn something new everyday