A Study of a Novel Insulin Lispro Formulation in Participants With Type 1 Diabetes Mellitus Using Insulin Pumps

Inclusion Criteria: * Male or female participants with Type 1 Diabetes Mellitus (T1DM) who are receiving insulin therapy via an approved insulin pump * Have a body mass index (BMI) of 18.5 to 33 kilogram per square meter (kg/m²), inclusive, at screening * Have blood pressure, pulse rate, electrocardiogram (ECG), blood and urine laboratory test results that are acceptable for the study * Have had no episodes of severe hypoglycemia in the past 6 months (requiring assistance in treatment by a second party) * Have venous access sufficient to allow for blood sampling * Have provided written consent and are willing to follow study procedures and commit to the study duration Exclusion Criteria: * Are currently participating in or completed a clinical trial within the last 30 days from a clinical trial or any other type of medical research judged to be incompatible with this study * Have previously participated or withdrawn from this study * Have or used to have health problems, laboratory test results, blood pressure or ECG readings that, in the opinion of the doctor, could make it unsafe to participate in the study * Had blood loss of more than 500 milliliters (mL) within the last month