I don't know how long it was sitting but it accumulated some leaf litter under the hood. the fuel cap was a little rusty and the tank was on an eighth. I test drove it, bought it and put ten gallons in with some Diesel Kleen Silver. I've been here before with my truck, the fuel "sock" was clogged. had to use a five gallon bucket in the bed with the fuel lines stuck it to get home. This looks like it might be easier to handle, the truck you have to drop the tank.