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  Premium fuel benefits? 7 Oct 2015 (Ask HJ)
  Given your valid recommendations for V-Power fuels, would my Civic benefit from consistent use of V-Power (or similar) unleaded, or would regular 95-Ron...
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  Direct injection and carbon build-up? 26 Jan 2015 (Ask HJ)
  I've been considering a Lexus IS250, and my internet research has highlighted problems with carbon build-up on the intake valves of the direct injection...
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  Noisy Polo fuel pump? 19 Apr 2013 (Ask HJ)
  We purchased a brand new Volkswagen Polo a few weeks ago. The car has developed a whining noise which you can hear from inside and outside. We are told...
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  What is the best high octane pump fuel available? 27 Oct 2012 (Ask HJ)
  I always try to use Shell V-Power super unleaded petrol, but here in Bideford there are no local Shell stations. The next nearest fuel station until recently...
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  Why is my Citroen C3 running slow and losing power? 9 Aug 2010 (Ask HJ)
  My 2002 Citroen C3 1.4 HDI is running slow, suffers a loss of power, and won't go above 3000rpm. It starts easily but it won't tick over straight away....
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  Why are there petrol fumes in my 1997 Volvo V70? 13 Nov 2024 (Ask HJ)
  I have petrol fumes in cabin of my Volvo V70 T5 1997. Driving normally the fumes are not too much of a problem, however, when coming to a halt it is noticeable...
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  Can I used home-stored diesel? 20 Oct 2014 (Ask HJ)
  What is your opinion on home-stored diesel? Is it fine To use after say 12/18 months storage?
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  How much spare fuel can I carry? 26 Jun 2024 (Ask HJ)
  What is the legal position on carrying in a private car a can containing spare E10 petrol? if it is legal so to do, what is the best currently available...
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  How do we store a plug-in hybrid electric vehicle (PHEV) for six months? 1 Apr 2022 (Ask HJ)
  We leave our diesel vehicles stored for up to six months with the tanks full to avoid condensation pollution. We're considering changing one of them to...
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  Fiesta fuel pump has failed. Help please! 20 Nov 2012 (Ask HJ)
  It's a problem with a Fiesta that's been left standing for four weeks while the owner was away from home. Now, the fuel pump is not running for 1~2 seconds...
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  Will the petrol in my Kia Niro PHEV deteriorate if not used? 4 Nov 2025 (Ask HJ)
  I own a six year old Kia Niro PHEV. I have recently downsized my housing and now live in a small bungalow. My car now mainly sits in my driveway and when...
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  The MPG on my car is terrible - what could be the cause? 3 Jun 2024 (Ask HJ)
  I have a Vauxhall Insignia and all seems mechanically sound with 68000 miles on the clock, a recent service and full service history plus new discs brakes...
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  How realistic are official fuel consumption and CO2 figures for new cars? 22 Apr 2020 (Ask HJ)
  I'm thinking of buying the new Ford Kuga PHEV 2.5. The fuel consumption figures are 201mpg and CO2 of 26g Are they serious? I’ll never achieve that, will...
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  Could a faulty fuel tank be affecting my Honda Jazz's fuel consumption? 17 Aug 2013 (Ask HJ)
  My 2010 Honda Jazz 1.4 EX gives strange fuel consumption results. I filled it to the brim, looked at the computer and it said it could do 490 miles until...
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  Should I use a fuel system cleaner for a GDI engine? 3 Oct 2022 (Ask HJ)
  Is there any evidence that a fuel system cleaner can stop the build up of carbon in a GDI engine, especially one fitted with a turbo?
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  Why will my Ford Sierra not start? 3 Jan 2020 (Ask HJ)
  I have an issue with my 1992 Ford Sierra 1.8 diesel. It has an intermittent problem where it will occasionally not start. Any idea what the problem could...
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  Citroen Synergie fuel pump 26 Nov 2015 (Ask HJ)
  Does a 1996 Citroen Synergie 1.9td have an in tank pump. Car starts but stalls but can then run fine. I have changed filter. Have found once pumped hand...
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  Why does my Rover 75 keep cutting out? 8 Nov 2014 (Ask HJ)
  My Rover 75 broke down recently. I had the alternator replaced and it ran for a few days, but cut out and would not restart. I was told the fault was a...
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  Volvo XC70 won't start 13 May 2014 (Ask HJ)
  My Volvo XC70 D5 (2010) Auto continually refuses to start. I have had a new fuel pump fitted, but the problem persists. The car is back with the dealer...
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  Windows down or air con on? 25 Jul 2012 (Ask HJ)
  My 60 Nissan Micra has air conditioning. I am told that using this dramatically increases the fuel consumption. I am also told that having the windows...