A fuel vapor control module for a vehicle comprises a refill diagnostic module, a refill volume calculation module, a canister loading module, and a purge adjustment module. The refill diagnostic module diagnoses a refueling event when an engine is started. The refueling volume calculation module determines a refueling volume based on a difference between a first fuel volume measured before the refueling event and a second fuel volume measured after the refueling event. The canister loading module determines a canister loading value based on the refueling volume, wherein the canister loading value corresponds to a ratio of a volume of a vapor canister to a volume of fuel vapor within the vapor canister. The purge adjustment module adjusts a fuel purge rate from the vapor canister based on the canister loading value.