I have a leaky water pump on my 405 TD but need to drive 150 miles,\nmainly motorway. Never faced this before. Questions:\n\n1. Can the leak get worse very fast?\n2. Will the temperature guage - reliable up til now - get unreliable if\nthe water gets very low?\n3. Does speed make a difference to rate of leak?\n\nObviously I want to set off with gallons of water on board and check and\nfill up at intervals as necessary.\n\nI've already put in K-Stop? K-Leak? but it didn't help much.\n\nThanks.