My owners manual says the Ford V10 chassis on my Allegro open road has a fuel capacity of 80 gallons. I don't think that's correct . I recently filled up the tank which registered 1/4. It took only 38 gallons to fill. Is it a 40 gallon tank?
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If it is a newer Ford F53 chassis it came from the factory with an 80 gallon fuel tank. The older F53's had 75 gallon fuel tanks. The only way it would be different is if the body builder changed it. The F53 does not have any fuel tank capacity options. Just one. If you PM me your chassis VIN I can even verify the factory fuel tank size. It is usually in the build data.
There is no adjustment for the fuel sending unit. In fact with a Ford chassis, if the sender is not reading as expected, it will trigger a trouble code in the PCM.
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