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Drinking too much fuel!

Started by _tufflx_ , Sep 09 2006 11:53 PM

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21 replies to this topic

#1 _tufflx_

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Posted 09 September 2006 - 11:53 PM

I am driving a 202 which is drinking way too much fuel. I am averaging 49 kilometres per 20 liters of fuel!

I'm not sure what to do first. I have tried adjusting the fuel mixture but that didn't really fix the problem. I don't seem to have any obvious fuel leaks but can smell constant strong exhaust fumes while driving. Does anyone have any ideas as to what the problem could be or what I should look at first??

Nick

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#2 _hrt1and2_

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Posted 09 September 2006 - 11:59 PM

thats bloody crazy mate, there has to be a leak somewhere i would presume. jack the car up and on either side of the tank there is a hoses. check that i had issues with them before. or maybe someone is stealing ur fuel.

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#3 _tufflx_

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Posted 10 September 2006 - 12:12 AM

I can't find a fuel leak anywhere! The only leaks I've got are oil leaks. I can't seem to get the fuel mixture right. I can feel it sucking too much air now although my fuel problem still persists!

Car is garaged and there is no way anyone could be stealing my fuel.

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#4 FastEHHolden

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Posted 10 September 2006 - 01:02 AM

Check your oil level ....but even if the pump diaphram had split I think your engine would have shat by now.

There was no point mucking with the mixture screw as its only idle mix...when you are off idle fuel is metered by a fixed jet.

Check things like sunk float, float level too high, choke stuck on, blocked air filter

What carb are we talking?

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#5 _LX8VD69_

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Posted 10 September 2006 - 01:25 AM

have you checked your floats that would cause the car to frink abit more although perhaps not that much, but a good place to start

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#6 rodomo

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Posted 10 September 2006 - 01:28 AM

Not quite right,idle mixture effects main jet metering.
Is your choke cable adjusted properly and not sticking or bent?

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#7 _luv the uc_

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Posted 10 September 2006 - 05:38 AM

If its a holley i've heard these run better with a fuel regulator dropping the pressure to around 3 - 4 psi??? Just stabbing in the dark tho.

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#8 _tufflx_

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Posted 10 September 2006 - 03:56 PM

Not sure what the carbie is. Maybe it needs reconditioning. Or maybe a its worth getting a new carbie all together. Anyone know what works best on the 202?

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#9 barny_lx

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Posted 10 September 2006 - 09:54 PM

how big are the jets?

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#10 TerrA LX

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Posted 10 September 2006 - 10:52 PM

40L/100Km WOW.

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#11 _Rob 5000_

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Posted 10 September 2006 - 10:59 PM

40lt /100km is like 2mpg ( i can only work in the old mpg) I'd say its impossible for a fairly standard 202 to ever use that much fuel no matter how bad the tune is and how hard you drove it. How are you working out your ecomony? The worst I reckon it could possibly do would be around 12mpg. It just couldnt flow that much fuel. does it reek of fuel when its sitting there idlelng? how is it running...rough, fine, barely?

as for what works best on a 202 what else is done to the engine? if its stock with just extractors for example I'd say 350 holley would pull it up.

Edited by Rob 5000, 10 September 2006 - 11:02 PM.

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#12 _tufflx_

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Posted 11 September 2006 - 08:12 PM

Not sure of the size of the jets.

I'm running 20 liters of fuel and am only getting my 50 odd kilometers untill the tank starts to run low. The car is running fairly rough at the moment. The car as I am aware is all stock with the exception of the extractors.

Tonight my tank ran dry in which I only managed to get 38 kilometers from a further 20 litres of fuel after filling the tank after it ran dry from the previous 20 litres I added!! The car doesn't reek of fuel when idleing although I can smell strong exhaust fumes from time to time even though I managed to adjust the fuel mixture screw, tightening it about 3/4 of a turn.

I am hopfully going to have another look at the problem but this time with my uncle on the weekend. I will eventually replace the carbie hopefully with a holley but am determined to try and suss out the problem now while I am flogging the car around home.

I'm going to pick up a new air filter tomorrow as the current one looks pretty old and dirty.

Choke cable is working fully but am not able to check the float level as I would need the help of my uncle...

So still need to check the float level and am putting a new air filter in tomorrow. But maybe the jets are too big, could that explain those stronger exhaust fumes I am smelling? The carbie looks standard and is probably stuffed. But is there anything else I should check out??

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#13 _Rob 5000_

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Posted 11 September 2006 - 10:06 PM

if the car is stock then the carby (unless its modified) should already have the right jets. Did the fuel usage start all of sudden? Is there anyway your odometer has stuffed up and you are actually driving more than the 50kms? From memory the old group C V8's used to do 4mpg at Bathurst so I find it hard to see how a stock 202 can possibliy use more than one of those. For your float to be high enough to pour that much fuel in I'd be suprised if it would even start never mind idle. There has got to more to it than this but from the info sorry I can't think of whats going on. :<_<:

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#14 FastEHHolden

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Posted 11 September 2006 - 10:22 PM

You need to work out fuel consumption by filling it up first....just chucking 20 l litre in and watching when the guage moves is not very accurate...that said It sounds like you have a single stromberg (they are stock) and I'll bet its a case of a stuck needle or incorrect float adjustment.

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#15 _tufflx_

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Posted 12 September 2006 - 09:20 AM

Well the time I let it run dry I added a further 20 litres and lastnight the tank ran dry and it worked out to be 38 kilometeres from the last 20 litres I added!!

The fuel problem has been like this since I bought the car around three, fourth months ago. My odometer seems to be working fine but as to whether its totally accurate I am not sure...

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#16 FastEHHolden

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Posted 12 September 2006 - 09:24 AM

Hehe...running out of fuel is pretty accurate.

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#17 _devilsadvocate_

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Posted 12 September 2006 - 10:40 AM

Perhaps b4 ditching the carby, take it to a workshop and get them to put a sniffer in the exhaust to see/verify that it is running way to rich or something else.

Perhaps a useful formula: mpg x L/100km = 282

or mpg = 282/(L/100km)

40L/100km in mpg = 282/40= ~7.1mpg

useful for remembering 10L/100km = 28mpg

Edited by devilsadvocate, 12 September 2006 - 10:46 AM.

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#18 _tufflx_

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Posted 12 September 2006 - 05:12 PM

On closer inspection of the carby and cleaning it up to read what it said, it is a stromberg and it's running on a 3 barrel manifold... But that still shouldn't be any reason to be drinking that much is it??!!!

I have put the new air filter in today. Haven't driven it but I am sure it is the carby still!

What are your thoughts on a WW stromberg over a 350 holley on a red 202, 3 barrel manifold?