Mechanical Fuel Lift Pump for John Deere 50/55 Series and 4040 Tractors SKU: QT59457

That rough idle, power loss, or hard starting on your John Deere might not be the injection pump - it's often this much simpler fuel lift pump. When lift pumps fail, they starve the injection pump of fuel, causing expensive damage if not addressed quickly. This replacement lift pump fits a wide range of 50 and 55 Series tractors plus 4040 models, delivering the steady fuel flow your diesel engine demands.

Why This Part Matters

• Mechanical diaphragm design for reliable operation without electrical failure points
• Maintains proper fuel pressure to injection pump under all operating conditions
• Prevents air entering the fuel system that causes performance problems
• Direct bolt-on replacement - no modifications needed

When the lift pump weakens, you'll notice symptoms during demanding operations first: bogging under load, difficult hot starts, or dying when climbing hills with less than half a tank. This pump restores proper fuel delivery, eliminating these frustrating problems. If you need help confirming fitment for your specific model, our team has 55+ years of experience helping customers find the right parts.