New Oil Pump 4003957 for Cummins Diesel Engine Part. Oil pump Fit for. If you not sure you need this pump, please contact me, hope you can understand! If any special request, please leave us message when you place order, or leave note in. Other countries: 3-10 work days. Other countrie: 20-45 work days. We can not send it to PO Boxes or APO/FPO address. Note: if you don’t receive the order over 30 work days, please inform us. 24 Hours a Day, 7 Days a Week. We will reply every message and solve the problem within 24 hours (except holiday). Feedback is very important to us.