Only 1oz per 10 gallons is what it calls for, but I often doubled it up to 4oz per tank for an an 18-19 gallon tank.Īfter a couple months of getting far worse MPG than I did earlier this year, I decided to buy a bottle of Hot Shots Diesel Extreme at Napa on sale. I was also running Howe's diesel cleaner (I forget the exact name) but it didn't seem to make an impact. I suspect the dirty old fuel in the tank, despite being mixed with 75% fresh fuel, still managed to clog the injectors. My coolant temp dropped by 10-15 degrees with the new fan clutch (and thermostat). Immediately, my MPG was down a lot, which I thought might have been the fan clitch putting a heavier load. Thing is, I also replaced my fan clutch at the same time as I did the fuel line replacement. I figured the fresh fuel would dilute it enough. It had about 1/4 of a tank of highly questionable old fuel in it but I filled it up and ran it anyway. My reasoning was to have a larger tank for that many more miles before refueling, a good way to save money on fuel by getting to the cheapest stations possible. I ran it that way for a good 9 months at least too, until I decided to use the rear, since I thought it was larger. It had been been on the front tank only for I don't know how many years. It's plumbed directly to the rear tank right now, not using the tank tank at all. My tank selector valve leaks badly when set to the rear tank, so I bypassed the valve when I replaced the leaky, rotten old fuel hoses. It might be 1 gallon larger at best vs the front tank. I thought the rear was larger, due to new aftermarket tanks being 22 gallon, but it didn't turn out to be. In my 85 Ford E350 6.9L diesel with ATS 085 turbo, C6, 4.10 Dana 70, about a 27-30ft Class C motorhome, it has dual tanks.
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