Method and apparatus for autonomously fueling machinery operating at fracking sites. Apparatus includes a main tank with a plurality of fuel lines individually coupled to the fuel tank. Pumps are connected to some of the fuel lines. Pump outputs are coupled to hoses extending to the machinery tanks to be refueled. The apparatus further includes a cap detachably connected to the hoses and machinery tanks. The fuel tank includes an intake filter capable of blocking approximately 10 micron contaminants with about 250 gallon per minute flow. The methodology of the present invention includes measuring the duration of machinery tank fuelings and the interval between fuelings. A first alarm is generated if the duration of fuelings is longer than a first interval. A second alarm is generated if the interval between fuelings is longer than a second interval.