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  My diesel is doing getting a low fuel economy, should I add an additive? 16 Jun 2020 (Ask HJ)
  I just got a diesel 2018 Honda Civic with just 4500 miles on it. I'm only getting 39mpg. Should I put a fuel additive in?
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  I stopped using premium fuel and got a huge dip in fuel economy - what do you think caused this? 5 Oct 2017 (Ask HJ)
  I have an Hyundai Ioniq, which I've run exclusively on Shell fuels for the 5000 miles that I've had it. I was getting 60-62 mpg on the regular stuff, then...
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  Why won't my classic Volkswagen Polo start? 13 May 2016 (Ask HJ)
  I have inherited a Mk2 Volkswagen Polo with only 2300 miles on the clock. However, it won't start, the plugs are sparking but there's no fuel getting to...
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  Hyundai fuel filter problem 13 Aug 2015 (Ask HJ)
  Last week a warning light came on telling me that there was "Water in Fuel Filter" and the car went into limp mode. I asked my local garage to fit a new...
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  What do you think of Esso's lower-priced premium fuels? 15 Jun 2013 (Ask HJ)
  Esso is now selling 'Super' variants of petrol and diesel at significantly lower prices than the Shell or BP equivalents. Do you have any feedback as to...
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  Should I coast downhills to save fuel or leave the car in gear? 6 Sep 2012 (Ask HJ)
  With my road tax renewal letter came a DoT leaflet on petrol saving. I was surprised by one of the tips: "Don't coast downhill or towards lights in neutral...
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  Diesel engine continues running after ignition switch-off 16 Jul 2012 (Ask HJ)
  the engine continues to run after ignition switch off and key removal. Engine tone louder and clackety higher revs. Engine will rev using throttle - but...
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  Dealer used the wrong fuel 3 May 2011 (Ask HJ)
  I have bought a used 206SW 1.4 HDi. On the drive home (20 miles) I felt that the engine was misfiring, but power seemed to be reasonable. On getting home...
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  My Volkswagen Golf sounds terrible and is leaking oil following a fuel sender pump replacement. 18 Aug 2010 (Ask HJ)
  Whilst driving along in my Volkswagen Golf IV automatic I heard a bang, and my car stopped and wouldn't restart. The AA diagnosed a fuel pump failure....
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  What happens to the fuel in the tank of my Ford Mondeo which is being scrapped? 23 Jun 2010 (Ask HJ)
  The clutch went on our Ford Mondeo today and we were towed back to our local garage. The quote for replacement was more than the car is worth, so we have...
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  Where is the fuel shutoff switch on the Renault Laguna? 5 Nov 2016 (Ask HJ)
  I cannot find the fuel cutoff solenoid on my Renault Laguna diesel. I know there's one somewhere, but none of the books or diagrams show exactly where....
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  Does this save fuel with my Jeep Wrangler? 24 Jan 2014 (Ask HJ)
  I have a Jeep Wrangler with tipronic. If I take my foot off the accelerator while in 4/5 th gear tiptronic and "coast" does the car "save fuel" as with...
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  Where is the fuel tank sender unit? 6 Mar 2013 (Ask HJ)
  Where is the fuel tank sender unit situated on an 04-plate Isuzu Rodeo or Vauxhall Monterey?
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  What fuel for my C-Class? 28 Feb 2013 (Ask HJ)
  The handbook in my Mercedes-Benz C-Class advises to use premium type unleaded petrol. However two other owners with similar cars say they use standard...
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  Van won't drive after minor accident 20 Aug 2012 (Ask HJ)
  I had an accident in my Vivaro 58 reg - only wing damage. The air-bag went off, it was replaced and repaired but now won't start. Fuel is getting to the...
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  Transit won't start 31 Jul 2011 (Ask HJ)
  Ford Transit ran out of fuel wont start. Tried bleeding cylinders. Tried pumping fuel filter but no diesel coming out of nipple.
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  Is premium fuel actually worth the extra over supermarket fuel? 11 Jul 2019 (Ask HJ)
  In a national newspaper recently they made a statement saying that branded petrol is no better than fuel bought at supermarkets. I know that you are an...
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  Standard vs premium petrol - which is best? 8 Feb 2016 (Ask HJ)
  I have followed your site for some time and have many a time heard the advantages of Premium diesel (or even branded diesel) over supermarket diesel. I...
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  Anti-freeze in diesel fuel 13 Dec 2012 (Ask HJ)
  My Citroen C4 Grand Picasso 1.6 HDi has gone into 'limp mode' and then cut out on me twice recently, accompanied by the ESP and auto handbrake warning...
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  Changing a Focus fuel filter 20 Jul 2012 (Ask HJ)
  I have a 2005 (55 reg) 1.6LX Ford Focus Mk2. I intend carrying out a full 3 year service this weekend. I have a service kit that I bought from a Ford dealership...