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Hey guys, so I have a 1985 Alfetta 2.0. It was the top of the range version with air con and electric windows and fuel injection.

Anyway, the fuel injection system broke completely and is thrown away, carbs were put on, but the only issue is I could only get a 42 and a 40 weber. They also have different emulsion tubes. And they all use 138 main jets.

I am a student so can't always afford new parts, it's tough lol. But I will not sell my car for the world. I have put 100s of hours into the body and paint and it is my old faithful.

The issue is I am only getting 7km/l and can't afford it going at that consumption.

It drives very nicely, I absolutely love driving her, but it does backfire when freewheeling/coasting in gear. Has that got something to Do with the bad consumption?

I should be getting 10-12km/l so I would really like some help in what needs to change to get her running lighter.

Please any advice appreciated, and gladly accepted. Bear in mind that I am a student so please don't tell me to go buy new emulsion tubes etc unless you know 100% that is the problem and is taking 3-5km/l from me.

The fuel pump is a very low pressure electric pump, and the needle and seats are all 100%


Thanks very much
Joel
 

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Hi Joel,

Glad to hear your keeping another one going. I'm no expert on the differences between the 42 and 40 but I'm guessing you'd struggle to balance two different carbs properly and to get them running tip top?

Could you try swapping your 42 for another 40, it won't cost anything and at least you'll have a proper starting point.
 

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With a properly set up matched pair of 40's and everything else spot on you should be able to get 27 - 30 mpg - 10-12 km/l so I guess its up to you if you think its worth it , that's about £10 saving a tankful (UK measure), Simon's is a good idea
 

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Running odd carbs will be a real problem but more importantly what are the choke sizes? If the choke sizes are the same you stand a chance of balancing them but if the choke sizes are different I think it will be very difficult if not impossible.

If the chokes are the same size do you have vacuum gauges to balance them or are you experienced at doing it by ear?

Have you checked the float heights - that is the critical starting point. You can do what you like with everything else but if float heights are wrong you are wasting your time.

Are they Dellorto or Webber and, if I can find one, would you swap your 40 or 42 for the other size. Exactly what carbs are they and what condition are they in?
 
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