Clubjazz - Honda Jazz & HR-V Forums
Honda Jazz Forums => Honda Jazz Mk1 2002-2008 => Topic started by: dave456 on June 09, 2014, 04:15:43 PM
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Hi Members, In the owners manual it says when filling the fuel tank to stop at first knock off. Do not fill it any
more than once.every car i have had i have neck it 3 times with no trouble.does it cause a problem with Honda
fuel tanks, or just take no notice of it. dave.
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The reason they say to stop at the first shut off is to leave room for the fuel to expand under hot conditions. I once filled a car to the brim drove a very short distance and parked in the sun on a hot day. When I returned to the car the petrol had overflowed and had run down the bodywork. If you were to brim it and immediatley go for a drive I don't think there would be a problem as you would be using fuel before it had a chance to expand to an overflow level.
I filled the car today, the fuel gauge was on exactly half and the pump shut off at 17.5 litres. The gauge in my Mk1 jazz was more accurate.
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Exactly as Pine says. Expansion.
If you have a 5L petrol can for garden equipment in the car, it doesn't half balloon/crumple up depending on the temperature.
I've filled the Jazz up to 1st click at over 40 litres. The low level light is nominally 7.2L in the manual,but this figure is noted in a service bulletin as +/- 2L, so it could be 9 or 5.
Do you need to force so much in?
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Also remember, it is a long filler pipe with the Jazz. The filler nozzle is back left but the tank sits across the car under the front seats. Seems to have quite a pressure release when you take the cap off, so probably benefits from some expansion room.
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Not only is 'fuel expansion' possible with warmth after the fuel has left a relatively cool underground storage tank in summer, but 'fuel slosh' when cornering or braking can cause any over-full tank to spill.
Though Jazz is not diesel, over-spill from DIESEL vehicles can cause a lethally slippery problem for motorcyclists. Just exits the tank while driving along, the car's driver remaining blissfully unaware.