Alliant Power AP4943048 Fuel Transfer Pump Kit — 1998.5–2002 Dodge Ram 5.9L Cummins VP44

The factory lift pump on the 1998.5–2002 Dodge Ram 5.9L Cummins is one of the most failure-prone components in the entire fuel system — and when it fails, it takes your VP44 injection pump with it. The Alliant Power AP4943048 is a direct-fit OEM replacement that delivers reliable fuel supply to protect your VP44 and keep your truck running.

Why the Factory Lift Pump Matters

The VP44 injection pump depends entirely on the lift pump for fuel supply. The lift pump pulls fuel from the tank, pressurizes it to 8–15 PSI, and delivers it to the VP44’s inlet. Without adequate supply pressure, the VP44 cavitates — creating tiny vacuum bubbles inside the pump that rapidly destroy internal surfaces. A VP44 running on a weak or dead lift pump can suffer irreversible damage in minutes.

This is the #1 cause of VP44 failure on these trucks. We rebuild VP44 pumps every week at our shop, and the first question we always ask is: what was the condition of the lift pump? In the majority of cases, the answer is either “it was dead” or “I don’t know.” A $300 lift pump protects a $1,400–$2,200 injection pump. There is no better return on investment in diesel maintenance. Learn more in our complete VP44 failure guide.

Specifications

Fitment

• 1998.5–2002 Dodge Ram 2500 with 5.9L Cummins ISB and VP44 injection pump
• 1999–2002 Dodge Ram 3500 with 5.9L Cummins ISB and VP44 injection pump
• Auto and manual transmission (5-speed and 6-speed)

⚠️ Important: This pump replaces the original frame-mounted lift pump on the driver’s side of the engine block. It is NOT a direct replacement for trucks that have been converted to an in-tank fuel pump. If your truck has been retrofitted with an in-tank pump, this kit must be reversed to install properly — call us at (530) 668-0818 if you’re unsure which setup your truck has.

Replaces OEM Part Numbers

• Cummins 3990082
• Cummins 3990105
• Cummins 4932707
• Cummins 4935730

What’s in the Box

• (1) Alliant Power AP4943048 fuel transfer pump assembly
• Mounting hardware
• Wiring connector

Signs Your Lift Pump Needs Replacement

Don’t wait for a complete failure — if you’re experiencing any of these symptoms, your lift pump may be on its way out:

• Longer crank times — truck used to fire in 2–3 seconds, now takes 5–8+
• Power loss under load — fine at cruise, falls flat when towing or at WOT
• Engine stalling when hot — runs fine cold, stalls after reaching temp, restarts after cooling
• Surging or stumbling at high RPM
• Fuel pressure below 5 PSI at idle (if you have a gauge)
• VP44 fault codes — P0216, P0251, P1688 that may actually be supply-side problems, not VP44 failure

For a complete breakdown, read our Diesel Lift Pump Guide.

OEM Replacement vs. Aftermarket Upgrade

The AP4943048 is an OEM-equivalent replacement — same flow, same fitment, same function as the factory pump, but more reliable and at a lower price than the Cummins dealer part ($300 vs. $400+). This is the right choice for stock trucks with normal driving and moderate towing.

If you tow heavy, run aftermarket tuning, or want maximum fuel system protection, consider upgrading to an aftermarket lift pump system from FASS or AirDog, which provide higher flow (95–260 GPH), adjustable pressure, 2-micron filtration, and water separation. These systems cost $400–$800+ but provide significantly better fuel quality than any stock replacement.

Installation Tip

If you’re replacing your lift pump because your VP44 already failed, replace both at the same time. Installing a new VP44 on a marginal lift pump will kill the new VP44 the same way it killed the old one. We offer remanufactured VP44 injection pumps rebuilt and bench-tested at our Bosch-certified facility. Pair them together and your fuel system is fully restored.

Why Buy From Valley Fuel Injection?

We’re not just a parts warehouse — we’re a Bosch-certified diesel fuel injection service center and authorized Alliant Power dealer with over 45 years of diesel injection experience. We rebuild the VP44 pumps that dead lift pumps destroy. We understand the entire fuel system — not just the individual parts — and we’re here to help you get it right the first time.

Questions about fitment or installation? Call us at (530) 668-0818.