My check was mailed on March 27 and I never received it. My state check came but not federal

You can track your return by checking the Where's My Refund website located here. 

If you elected to have your fees deducted from your refund, the IRS will send your return to Santa Barbara Bank, where they will deduct the fees and then deposit any remaining refund into your account. 

You can track your refund at the Santa Barbara website by clicking here.