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on normal that trk should be around 6-7 gallons used per one hundred miles drove. i based that at 15 mpg. now that is also based on a V8 engine. now 1 gallon of gas is 3.78541178 liters which totals 12 galons of gas to 45.42494136 liters. This would mean that it took 12 gallons of gas to travel 100 miles which totals 8.3333333333 mpg. not as good as i would have thought. 8 miles per gallon (mpg) hell that engine must be a big block 460. If it is that big cubic inch i could understand but any other motor should do better mpg than 8.3. so i agree that is not normal, tune up, or look for fuel leak in the fuel supply or( feed ) line. From the tank to the motor. This must be a canadian truck yes? well hope for the best or trade that guzzler in for a new breed. stay warm!
Try draining tank first if there is a drain plug. If no drain plug you will have to drop tank to empty it. Once tank is empty put in 2 gallons / 10 Litres of fuel and add a quart or 1 Litre of denatured alcohol or methyated spirits. The alcohol will mix with any water and consequently disperse through the fuel which will then be burnt normaly in the engine. When most of this mix is used up fill tank and add anothet pint of denatured alcohol to mix with any remaining water.
Make sure you use lots of wd40 or other solvent on strap bolts. Use a flashlight not a droplight while working. Keep all open flame sources and sparks (even electric drills etc) away from work area. make sure the tank is low on fuel...gasoline weighs over 7lbs per gallon! have something to put fuel in to drain tank further after removal. An empty tank is a bomb unless it is left open and allowed to vent out for a few days in a safe place outdoors. If you intend to re-use it, wash it out with soap and water then to store, dry it out, coat inside with oil. If transferring fuel pump, be careful not to bend float arm or gas gauge will not be accurate. Other than that it's a big box with some straps holding it in. good luck