Join Date: Jul 2009
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You can't take whats most likely a bad sender, or something along those lines as "having a diesel would be this much trouble." If you're having second thoughts this early in, you might want to get out of it cause diesels aren't cheap, and have there share of issues. This issues just happens to be something that, assuming it is a bad guage reading, could happen to any vehicle.
As far as mixing old fuel with new fuel, the fuel is being sloshed around in the tank, and constantly circulated so thats not an issue. Like I said, the reason the light didn't come on is its based off of the guage reading. Only when the guage gets so low, will it come on. If the sender is sending a wrong amount of fuel, the guage will stay up, and therefor the light won't come on as it thinks it has sufficient fuel.
I often times fill up my truck when it gets down to 1/4 tank. My guage works fine, but when diesel gets up there in price, it keeps me from having to restart the pump at $75 as most stations stop there around here. Also, I fill up whenever is convenient. If I happen to be passing a station at at or just below 1/4 tank, and I have time to stop, I fill up.
Ford guages aren't really all that great in my opinion. I'd have it checked out and see what comes of it. Maybe get yourself a gasser if you're thinking this is a big issue...