1998.5-2002 Dodge Ram 5.9L Cummins Fuel Transfer Pump Kit — Alliant Power AP4943048
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
| Part Number | Alliant Power AP4943048 |
| Flow Rate | 50 GPH (gallons per hour) |
| Pressure | 10 PSI |
| Port Size | 12×1.5 straight metric |
| Type | Electric fuel transfer pump |
| Installation | Direct-fit, plug-and-play — no modifications required |
| Warranty | 24-month manufacturer warranty |
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
- Alliant Power AP4943048
- Cummins 4943049 / 4943048 (base service number)
- Cummins 3990082, 3990105, 3990106
- Cummins 4932707, 4932708
- Cummins 4935730, 4935731
- Cummins 3948070, 3938368, 5362274
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.
Why do I see this pump cheaper online?
Short answer: it is usually not the same part — and a pump failure does not stay in the pump. Read why ↓
Search any OE number and eBay, Amazon and a dozen storefronts will show it well under dealer cost, sold by outfits with no name, no address and no phone number. We lose business to those listings every week — and we see a lot of them come back through our shop. Here is what is actually different.
- The part number proves nothing on its own. Counterfeit injectors and pumps are stamped with the same OE numbers as the real thing, in housings cast to look identical. The number in the listing title tells you what the seller claims it is, not what came off an OE line.
- “Remanufactured” is not a regulated word. A genuine reman unit is stripped to bare components, has its wear parts replaced — nozzle, plunger and barrel, solenoid, seals — and is then run on a calibration bench until it meets the original flow and response spec. A cheap one is very often cleaned, resealed, painted and shipped. Both get called remanufactured.
- No full teardown, so no idea what is worn. A proper rebuild means the unit comes apart completely and every part gets inspected and measured against spec — not just the ones that are obviously bad. Skip the teardown and you are reusing worn internals inside a freshly painted housing. It will run on the truck. It will not last.
- No factory-spec bench load testing. A unit is not finished until it has been run under load on a test bench and made its numbers across the range, not just at one easy point. That bench time is most of what you are paying for. Sellers working on price cut it first, because nobody can see it in a photo.
- The warranty has to be honored by someone. Everything we remanufacture in house carries a one-year warranty, with 30 days on electrical components. Parts we supply as an authorized dealer carry the manufacturer’s own warranty. Either way you call us, a real shop in California, and we sort it out. A marketplace warranty usually means shipping the part overseas at your own cost and hoping for a reply.
- No core program. We credit your rebuildable core back in full. Discount sellers generally will not take one, so the gap narrows the moment you account for the core you are now stuck holding.
- A pump failure does not stay in the pump. When a high-pressure pump comes apart it sends metal downstream through the rails, the lines and every injector. That is the whole reason fuel contamination kits exist. A pump that was never tested to spec is the cheapest possible way to buy that repair.
We are an authorized dealer and a working fuel-injection shop — we have been rebuilding and testing this hardware in Woodland since 1993, and the people who answer the phone are the people who run the benches. Not sure this is the right part for your engine? Call us with your serial number before you order and we will confirm it. Send your rebuildable core back and the core charge is refunded. And if a price somewhere else looks too good, call 530-668-0818 and we will tell you straight whether it is a deal or a problem.
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