534BC

My fuel mielage computer in overhead console is consistantly off by about 10%. It reads exact for miles, but the gallons is always off too.

Is there a way to calibrate the fuel used? It throws the mpg offf as well.

thanks

GregA

I don't think there is a way to calibrate the overhead computer.

I believe there was a thread about mileage readings a couple of months back and the computer seemed to be a bit high by about 5-10%.

Take Care,

__________________
Greg A.
2001 Chevy Venture w/some "enhancements" ~ 72K Miles (July 2007)
1992 Jeep Cherokee Laredo, 4.0L, Automatic ~ 131K Miles (July 2007)

85lolo

I ran out of gas in my 99 venture, it still told me I had 42 miles left

534BC

Mine ran out at 37 miles. It always shows 22 mpg average, but the actual is 20 mpg. The gallons is also 10% off.

cdru

Current fuel economy, trip fuel economy, and fuel used is determined by injector duty cycle. Remaining fuel is determined by the fuel level sending unit. Just due to manufacturing variances, I'd expect some give in the numbers. 40 miles when it really was empty would seem to be a little on the high side, but knowing the shape of the tank, I could see how that amount of error I guess.

That being said, I would never run the tank that low on purpose. The pump is in tank and relies on the fuel to cool it. When you run the tank empty, it allows the pump to possibly overheat.

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Vinyl adds horsepower, right?

Memster1

When we first had our '99, my wife ran out of gas. She stated that the fuel tank light was on for a bit and when she checked the overhead consol, the miles to empty still showed around 40. I have always filled the tamk as SOON as the fuel gauge light shows up on the dash.

On another note, the fuel pump was replaced last year. Since then the trip computer seems to state incorrectly the total miles available on the full tank. Probably something to do with the unit calibration. I just make sure to keep the van filled up.

534BC

My fuel low light comes on at around 100 miles to go and runs out at 40 miles.

(I did this on purpose because I had to know where it ran out.)

Actual 60 and 0 right? The computer seems to figure the total miles available by the current averge mpg and that "injector duty cycle" thingy. It is always off the same amount and it looks they are all the same way.

Thanks for the info friends.

broughy84

our 98 runs out of gas at 60 miles.....I found out on I 80 in Nebraska

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Matthew Brough
1998 Chevrolet Venture -- 104,000 miles
1988 Chevrolet Silverado -- 156,000 miles
1996 Chevrolet Cheyenne -- 107,000 miles