A massive recall for a faulty fuel pump affects over 850,000 popular vehicles, but Ford has no immediate fix and has ordered dealers to stop all sales.

Ford said it began sending letters to affected owners this week to warn of safety risks related to potential fuel pump failures.

A remedy is not yet available, either. Ford says owners of these models will be notified when a fix is ready. Notably, the majority of the 850,000 units included in the recall are Broncos (109,881) and Ford F-150s (455,261) In any event, this recall further suggests that Ford dealerships will be busy with recall work for some time to come.