GolfGTIforum.co.uk
Model specific boards => Golf mk3 => Topic started by: Snowey on 11 March 2010, 10:17
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Hi guys, just interested to see if this is crazy, possible hole in my fuel tank? :grin:
Had a full tank to the brim then refilled after about a quarter left. Turned out i'd covered just 164 for 37 quid! Was driving normally, not like a granny but not silly either. Do quite a few short journeys and a lot of town driving but surely something is wrong?? :sad:
Any way of improving economy mechanically?? I really don't thrash it everywhere!
Cheers!
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Hi Mate. Doesn't sound that good really. Have you tried cleaning the throttle body as this improves the cars performance and the fuel economy as well. Won't make a massive difference but will help. Also has it had a good service recently?? i.e. Air Filter, Plugs, Leads Cheers Deano
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Hi guys, just interested to see if this is crazy, possible hole in my fuel tank? :grin:
Had a full tank to the brim then refilled after about a quarter left. Turned out i'd covered just 164 for 37 quid! Was driving normally, not like a granny but not silly either. Do quite a few short journeys and a lot of town driving but surely something is wrong?? :sad:
Any way of improving economy mechanically?? I really don't thrash it everywhere!
Cheers!
Not going to help.
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i just got 170 miles out of 25 quid and this with a broken thermostat that makes it run cold - which ill add is town driving
going down to london i got 300+ miles to a full tank again with the broken thermostat
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what model 16v or 8v?
In my 16v im looking at £20 ish to 100miles!
Less when driving around town to work and back so your sounds slightly under average but not "too" bad!
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My last job the journey was 5 miles each way approx 3 miles of stop start each time.
I would get 150 to 160 miles from a tank on just town driving!
At the same time i could do Brighton and back about 90 miles on less than a quarter of a tank.
when i had the exhaust done and the air box drilled+KN i lost mpg down to about 140 per week!
Now i drive like a granny to work the journey is the same length but less traffic so i get about 250 to 20/25 quid which is good for the pocket.
Shame the 8v tug is due for MOT this month i dont thing the Targa floor is going to go down well
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in my 8v i get 320 miles wit bout 45 quid
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That works out to about 22 to 23 mpg depending on the price of petrol down your way.
The book figure for urban driving in a 16v is 25mpg and the 8v isn't much differant. The short journeys will be the killer.
Paul
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I just got 400 miles from £55 in my 8v, thats a combo of town driving and a-roads, if that helps
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Yeah cheers guys, maybe not as drastic as I maybe first thought but still a little suprised.
Town driving is definately a killer and appreciate that. Got a new air filter today (well scrappy but next to new) but maybe a full service as suggested could help but does it really make that much difference? Something needs to help as at this rate I feel like i'm funding bloody BP!
Always find petrol seems to go more quickly from lower half of guage so gonna try keeping it topped up but this could just be perception!
Chris
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I can get 100miles to £10 with motorway driving with the 16v
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In my golf i filled my tank and only got about 267 miles town driving :cry:
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town driving i get 20-25mpg and on a run its about 30. If i want to have fun, its a lot less :D
i thought something was wrong but it was just me adjusting from a bottomless tank in a 1.5td van :D
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I most definitely agree with the lower half of the fuel tank seeming to drop significantly quickly than the top half....poxy gauges . senders.
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its the shape of the tank.
Its curved and narrower at the bottom, and flat on top, so the lower half has a steeper height-to-volume drop that the top half which is pretty square dimensioned so it drops evenly. Like a bowl....the bottom half has less in it than the top half.
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That in my eyes makes it sh!t then as you'd have thought that VW would have taken that into consideration when designing the fuel gauge sender??
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I agree mate.
unfortunately they all use a float-driven variable resistor so "level" is still "level", but under a constant flow, the resistance values of the sender as it goes from full to empty can only follow the top surface of the fuel, and as you can see a round bottomed tank will not give a linear reading from top to bottom as the curved lower part has less volume.
I would have thought a better idea would be a load sensor / strain-gauge that measured the weight of the fuel in the tank - and could exactly display the tank contents to the millilitre as fuel has a known weight, like water does, due to its specific gravity value.
The strain gauge could be mounted in a small depression in the bottom centre of the tank so it gets a pretty constant reading.
:cool: