You can use the motor shaft seal from this kit to convert existing gear pump to a B100 compatible pump.

Gear Pump Overhaul Kit, Kit Type Overhaul Kit, Product Type Overhaul Kit, For Use With M-1115S, M-150S, M-180S, M-240S.

Fuel Transfer Pump, Max. Outlet Pressure 15 psi, Rated Voltage 12V DC, Pump Connection ID 1 in, Hose Length 12 ft, Cord Length 18 ft, Nozzle Operation Automatic, Thermal Protection Yes, Power Source Electric, Variable Speed No, Includes Discharge Hose Yes, Self-Priming Yes, Discharge Connection Type FNPT, Housing Finish Powder Coated, Includes Nozzle Yes, Pump Connection Type FNPT.

Complete overhaul Kit for your GPI gear pump. Manufacturer: ‎GPI. (M-150, M-180, M-240, and M-1115). Style: ‎Fuel Transfer Pump. Inlet Connection Type: ‎Threaded. Auto Part Position: ‎Inner. Global Trade Identification Number: ‎19.

W104 This is a brand new GPI Electric Fuel Pump Conversion & Overhaul Kit, model number 110504-1. It is designed to fit brand GPI and is suitable for use with Grainger items. The kit includes a gear pump overhaul kit and is manufactured in the US. The dimensions of the package are 5.500 inches in length, 4.000 inches in width, and 4.000 inches in depth, with a weight of 0.21.