Need to service our L8000 dump truck and some other equipment that don't have enough room to pour fluid in, and some of the transmissions/gearboxes take 4-5 gallons a piece. Have about 15 gallons total to do. Would a generic 12v fuel pump work to pull oil out of a bucket and pump it up into a transmission? Or would i be better off just spending a couple hundred bucks on an actual oil pump?