1bbl carb tuning

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Mar 26, 2012 | 07:43 PM

custom_truker

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From: USA

1bbl carb tuning

I haven't been able to do much work on my truck in a long time (1978 f100), and it is due for some work. I am wanting to tune the carb and try to get the best fuel mileage I can (might need a rebuild actually). Right now I get about 12.5mpg with a pretty even mix of city and highway driving. If I drive all highway I can get up to about 15mpg. From what I have been reading, it seems like it should be better.

The last big thing I did to the truck about 7 years ago was replace the carb with a reman unit. I am not 100% I put the vacuum advance hose in the correct place, anyone have pictures? Or a way I can determine if I did or not?

Any other advice is much appreciated.

Mar 27, 2012 | 07:52 PM

rustywheel68

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Joined: Mar 2006

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the vacuum hose should run from the vacuum advance can to either a vacuum nipple on the carb, or on the intake (people will tell you different things here, i'll leave that up to you.)

you can tune your idle mixture easily with a vacuum gauge and a screwdriver. unfortunately, that only helps at idle...

i'm trying to think of simple ways to tune the power circuit...
the most scientific way is to put an oxygen sensor in your exhaust, and read it with a voltmeter- or hook up a vacuum gauge in the cab, and monitor while driving at cruise- change jets as necessary for maximum vacuum.