Inclusion Criteria:  T1D for at least 1 year and continuously using insulin for at least 1 year Using an insulin pump for at least the last 6 months Have hemoglobin A1c (HbA1c) value of ≤ 9.0% Have a body mass index (BMI) within the range of 18.5 to 35.0 kilograms per square meter (kg/m²) Have medical and laboratory test results that are acceptable for the study Have venous access sufficient to allow for blood sampling  Exclusion Criteria:  Hemophilia or any other bleeding disorder Have a pathologic tuning fork test as assessed with a Rydel-Seiffer tuning fork Are taking anesthetics or pain medication regularly or intermittently which could interfere with interpretation of pain scale Have had more than 1 episode of severe hypoglycemia (defined as requiring assistance due to neurologically disabling hypoglycemia) within the last 90 days prior to screening Have had more than 1 emergency room visit or hospitalization due to poor glucose control (hyperglycemia or diabetic ketoacidosis) within the last 6 months prior to screening Have any hypersensitivity or allergy to any of the diluents or excipients used in this trial Have or used to have health problems or medical test results that, in the opinion of the doctor, could make it unsafe to participate, or could interfere with understanding the results of the study Have participated, within the last 30 days, in a clinical trial involving an investigational product Have used or are currently using Lyumjev® as part of their standard insulin therapy