To find the payload capacity (how much weight you can *add* to the van), you need to:
1. Find the GVWR sticker: Look for it on the driver's side doorjamb.
2. Find the curb weight: This is the weight of the van itself without passengers or cargo. You can often find this information online using your van's VIN number, in a Ford owner's manual, or through a vehicle history report.
3. Subtract the curb weight from the GVWR: GVWR - Curb Weight = Payload Capacity.
Without the GVWR and curb weight, I cannot tell you how much weight your specific 2002 Ford E250 van can hold. Overloading a van is extremely dangerous and can lead to accidents, tire failure, and damage to the vehicle. Always check the sticker and stay well below the maximum weight limits.