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• Does fuel economy improve in winter ? 18 Nov 2009 (Forum)
  Just wondering if fuel economy improves in colder weather or gets worse in winter if the same journeys are made. For me I noticed with petrol engine cars the fuel economy goes down in colder weather. Does this also apply with diesel engine cars or does this improve (air density etc) ?
• Fuel from water 23 Jul 2008 (Forum)
  Just seen an advert in my local rag saying the following: FUEL FROM WATER Hydrogen diesel fuel enhancement guaranteed 10-15% increased MPG and lower emissions £85 I already know that if things sound too good to be true but does anybody know any more on this wether it works or not?
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  Should I get another diesel car? 10 Mar 2017 (Ask HJ)
  I drive about 25,000 miles a year on motorways and country roads for my job and need a reasonable sized vehicle to carry equipment plus a 4x4 capability,...
• American Diesel 22 Jun 2006 (Forum)
  Is the quality of diesel in the USA still terrible? Or is the 'diesel boom' leading to better quality? I ask because VW diesels are the most popular there for cars (I think) so if they can run to hundreds of thousands of miles on what they sell there, our highly refined diesel should mean a very low stressed fuel system.
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  What is a dual mass flywheel? 13 Oct 2012 (Ask HJ)
  Please clarify two points for me. Exactly what is a dual mass flywheel, and is it something to be regarded as a potential future bill, like belt driven...
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  Is a blocked DPF causing my 2004 Ford Mondeo to smell of diesel? 5 Sep 2010 (Ask HJ)
  I have a 2004 (53 plate) Mondeo Ghia X 130, and recently I have noticed a smell of diesel at the end of a long run on A-roads and motorways when I get...
• Passat b7 2.0tdi - Fuel filter replacement 7 Jul 2019 (Forum)
  Hi, Just did a fuel filter replacement a 2.0tdi. After searching some posts on the matter, i've heard that incorect air bleed of the fuel line could damage/ crack the hpfp. Most people say to unscrew the 5 bolts, remove old filter, clean housing and ad new filter after the housing is filled with clean diesel and avoid puting diesel through the center hole of the filter.
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  Fuel pressure issues 3 Sep 2014 (Ask HJ)
  I have read about a possible issue with the Ford C-Max and the fuel filter becoming easily blocked with emulsion, which forces the car to go into limp...
• Peugeot 106 (1991 - 2002) - 1995 1.5 Diesel engine problems - tud5 14 Jan 2008 (Forum)
  I replaced the stop solonoid about 50 miles ago, but I'm not sure if a fault with that could cause these symptoms. More likely, I had not long filled up with a full tank of diesel (I definitely put the right fuel in!) before the problem started. Would contanimated fuel cause these problems? How would I check it? If so, can I get away with just draining the tank or would I have to empty all the lines too?
• all - local diesel 19 Mar 2012 (Forum)
  local deesel prices in Hampshire are almost up to 150p a litre. The latest protest by the fairfuel organisation has seemingly fallen on deaf ears. Motorists...
• Peugeot 405 Diesel (1988 - 1996) - 1994 1.9 Fuel Injectors 25 Nov 2008 (Forum)
  TY for the answers to my previous question you are right it started when I tried again. I need new injectors according a M.O.T inspector. Any idea where...
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  What might have caused my 320d injector pump to fail? 16 Apr 2013 (Ask HJ)
  Have just had the fuel injection pump on a 2000 BMW 320D replaced at a cost of £2,500. Trying to find out if BMW's recall on the fuel pre-delivery pump...
• Which diesel fuel? 4 Jul 2004 (Forum)
  I have followed the threads about petrol quality and it seems a safe bet to use Texaco, Shell or Esso every now and again. It's only a couple £ a year...
• Mercedes C220 Diesel Pump 21 Apr 2003 (Forum)
  Another thing is the engine runs on for 3-4 seconds after turning the ignition off. Took the car to local garage that specialises in MB and he put his test box on, the message : " FUEL INJECTION SHUT OFF VALVE" came up. The question is should I get the Fuel Injection Valve replaced or should I get a new diesel pump?
• Mercedes ML250 - Help....Fuel System Needs Replacing? 14 Nov 2014 (Forum)
  The car has been in to the main dealer 4 times, they have tried various things but failed to find the problem. They have just rang to say there are iron-filings in the fuel, this is caused by the some part of the fuel system (pump?) breaking up and must have been due to a mis-fuel (i.e. I’ve put petrol in a diesel engine) and a lack of lubrication. They say this is the cause of the stalling and the Mercedes warranty is obviously therefore invalid.
• Diesel oil spill on car 23 Mar 2004 (Forum)
  is diesel fuel non-colour and transparent, recently my car was splash by these non-colour oil (which I believe to be diesel), does it harm the paintwork and trimmings etc, on my car. Got it wash away now. ???
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  Under achiever 10 Jul 2010 (Ask HJ)
  We exchanged our SEAT Ibiza 1.9 diesel, which had given us trouble free service achieving and sometimes exceeding the mileage figures quoted by the manufacturer,...
• diesel mondeo wont start 22 Apr 2007 (Forum)
  i was driving along in my r reg mondeo diesel for no reason it cut out, the car has been serviced every year oil + filter changed every 6k miles,just had cam belt + diesel pump belt changed about 3k ago, the car has only done 115k miles, r.a.c man came out to me, he thinks the diesel pump just packed up,why would this happen out of the blue when the car was running lovly in till this happened never given me a problem before and its never been run low on diesel allways kept at half a tank and i just filled the car up can this just happen for no reason and i allways put in decent fuel not supermarket fuel many thanks on you advice trev
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  Should I have the oil changed in my Volvo V70 following the DPF recall related to oil contamination by fuel? 3 Jun 2010 (Ask HJ)
  You probably know that Volvo have issued a safety recall related to rising sump oil levels in their D5 Diesel engines with a DPF, which is caused by excess...
• Cavalier Diesel wont start 12 Mar 2004 (Forum)
  Hi I have a Vauxhall cavalier 1.7td 1993 model (ISUZU Engine). I have spent 2 weekends on it but cant get it started after it stalled while driving. Have...