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VVWC :: View topic - Terrible fuel economy
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Terrible fuel economy
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donandrobin
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PostPosted: Tue May 07, 2013 8:21 pm    Post subject: Terrible fuel economy Reply with quote

My '74 1600cc has what I think is terrible fuel economy... I'm using the great https://www.fuelly.com/ website to track my fuel costs/mpg/etc... and I'm getting about 14.5L/100km... but most other VWs on there for the same year are getting about 9.5L/100km, at worst...

The car runs 100%, although it tends to stall when it's cold for about 10 mins after starting in the morning unless I keep my foot on the pedal at stop lights, etc. Could it be the carb or a leak somewhere? My 97 BMW V6 gets better mileage, about 11L/100km Smile

Any thoughts?
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mitchy965
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PostPosted: Tue May 07, 2013 8:46 pm    Post subject: Reply with quote

whats your combo?? all stock? have you had a look at your plugs? recent tune up?
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haywirebutton
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PostPosted: Tue May 07, 2013 10:59 pm    Post subject: Reply with quote

check the color of your plugs....rich?lean? check your timing
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ketchuphead
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PostPosted: Wed May 08, 2013 7:32 am    Post subject: Reply with quote

locking gas cap?
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donandrobin
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PostPosted: Wed May 08, 2013 12:18 pm    Post subject: Reply with quote

Thanks for the comments... I've done new plugs, wires, rotor, cap, air filter and oil change a few months back.

The gas cap is the original VW one, and it seals tight. I park the car in the backyard and don't suspect anybody is stealing gas as the gas gauge is consistent...

Everything is 100% stock from the carb to the distributor. Tires are new, inflated properly. When in neutral with e-brake off, it rolls freely on the slightest incline.

got me baffled.
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52split
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PostPosted: Wed May 08, 2013 1:09 pm    Post subject: Reply with quote

yah that is bad mileage if you compare it to the new VW XL1 that gets .91 litres per 100 km. have you checked to see if your choke is staying on when warm. take the air filter of and look. also see if its firing on all four , could have a bad plug wire that stops working that causes unburnt raw fuel.pull the dip stick and smell for fuel in oil.my 2 cents
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donandrobin
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PostPosted: Wed May 08, 2013 4:20 pm    Post subject: Reply with quote

thanks, those are great ideas... will check!
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mitchy965
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PostPosted: Wed May 08, 2013 5:27 pm    Post subject: Reply with quote

could also pull the top of the carb and check for proper float level/needle and seat,sunken float.
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donandrobin
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PostPosted: Fri May 10, 2013 5:42 pm    Post subject: Reply with quote

I'm going to check all these things this weekend, thanks again for the tips!

Not sure if it's worth mentioning, but when I fill the gas tank full, the car smells like gas until it get's to about half a tank after driving around for a bit - is there an old hose absorbing the gas or something I should replace?
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74super
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PostPosted: Sat May 11, 2013 9:09 am    Post subject: Reply with quote

Quote:
Not sure if it's worth mentioning, but when I fill the gas tank full, the car smells like gas until it get's to about half a tank after driving around for a bit - is there an old hose absorbing the gas or something I should replace?


This a problem with almost all Super Beetles and I've been trying to solve it in mine since I got it. I've ordered new large vent hoses from CIP which should be here next week and hopefully that'll solve it. The main fuel filler hose and the thin rubber seals that go under it can also be a source as well as the O ring under the fuel sender or the collector and its little hoses. I've removed the collector and put a hose from one to the other of the small tubes on the driver's side of the tank. See the diagram attached.



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donandrobin
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PostPosted: Thu May 30, 2013 12:01 pm    Post subject: Reply with quote

So I just filled up today and my MPG is only 16.7, or 14.1L/100KM.

Chris, I'm thinking I'd like to order a pertronix ignition (I don't want to replace the distributor or coil if I don't have to), and a new oem carb... it's a 1600cc stock dual port AH... and what about the air filter? It's the stock plastic unit with a paper one, should I go K&N?
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mitchy965
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PostPosted: Thu May 30, 2013 12:19 pm    Post subject: Reply with quote

at that mileage your plugs must be coal black! if you have checkÚd -replaced suggested items,have a look at the advance mechanism in the distributor. suck on the vacuum diaphram does it hold? throw a timing light on it to check mechanical advance rate,does it advance?
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mitchy965
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PostPosted: Thu May 30, 2013 12:20 pm    Post subject: Reply with quote

find your problem before adding any aftermarket items.
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Bow-Wow
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PostPosted: Thu May 30, 2013 12:47 pm    Post subject: Reply with quote

mitchy965 wrote:
find your problem before adding any aftermarket items.

Indeed. As much as I'd love to take your money, let's make sure we're spending it on the right stuff.
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donandrobin
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PostPosted: Thu May 30, 2013 1:11 pm    Post subject: Reply with quote

Ok I'll try those things after work. Thing is, the car runs 100% - no lag, great on the highway... one press of the gas in the morning and starts right up...
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