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post #11 of (permalink) Old 03-23-2007, 08:13 AM
nolan62
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Join Date: Jan 2006
Posts: 235
Terrible fuel economy in my 6cyl Falcon.... tuning questions....

I have built 5 inline 6's and never got less than 20mpg. On one I suddenly dropped to 11mpg. I thought someone was stealing gas. It turned out to be a pin hole leak in the fuel line from the pump to the carb. It only leaked with the engine running and sprayed down at the ground. As soon as the engine cut off it stopped so no puddle under the car. Run your hand along the fuel line with the engine running.

Other than that I would have to say someone is draining your tank. I can't think of any adjustments or combination that would drop your mileage that much. If it were that rich you would see a lot of black smoke coming out the tail pipe.
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