2016 Ram 1500 5.7 Fuel Pump: What You Need to Know Before You Replace It
If you own a 2016 Ram 1500 with the 5.7L HEMI V8 and you are dealing with hard starts, engine stalling, or a loss of power under load, the most likely cause is a failing fuel pump inside the fuel tank. The 2016 Ram 1500 5.7 fuel pump is a known wear item, and replacing it before it leaves you stranded is the smart move. In most cases, a complete in-tank fuel pump module replacement—not just the pump motor—is the correct repair, and choosing a high-quality replacement unit will save you from doing the job twice.
Below, we walk through the symptoms, causes, replacement options, step-by-step guidance, and cost expectations for the 2016 Ram 1500 5.7 fuel pump, so you can make a confident decision.
1. Common Symptoms of a Failing 2016 Ram 1500 5.7 Fuel Pump
A bad fuel pump rarely fails without warning. Watch for these signs:
Hard starting: The engine cranks but takes longer than usual to fire, especially on a cold morning or after the truck has been sitting.
Engine stalling: The truck may stall at idle, at stoplights, or while driving at low speed because fuel delivery drops suddenly.
Loss of power under load: When you accelerate, merge onto a highway, or tow a trailer, the engine hesitates, surges, or feels weak. The 5.7 HEMI needs steady fuel volume, and a weak pump cannot keep up.
Whining noise from the fuel tank: A loud hum or whine coming from behind the rear seat area can point to a worn pump motor.
Check Engine Light: You may see codes like P0087 (fuel rail pressure too low) or P0230 (fuel pump primary circuit). A scan tool will confirm whether fuel delivery is the issue.
Engine will not start at all: If the pump has completely failed, the engine cranks but never starts. You will not hear the usual two-second hum from the tank when you turn the key to the "on" position.
If you notice one or more of these symptoms on your 2016 Ram 1500 5.7, test fuel pressure before replacing parts at random. A pressure test at the fuel rail tells you whether the pump is holding the correct pressure.
2. Why the Fuel Pump Fails on the 2016 Ram 1500 5.7
Understanding why the pump fails helps you avoid a repeat failure.
Normal wear and mileage: The in-tank electric pump runs every time you drive. Over years and miles, the motor brushes and internal parts wear out. Many owners see pump problems between 100,000 and 150,000 miles, though it can happen earlier or later.
Running the tank low often: The fuel in the tank cools and lubricates the pump. If you regularly drive with the fuel level near empty, the pump runs hotter and wears faster. Keeping at least a quarter tank is a simple habit that extends pump life.
Contaminated fuel: Dirt, rust, or water in the tank can clog the pump intake screen and damage the pump. A clogged in-line filter (if equipped) or a dirty tank makes the pump work harder.
Electrical issues: A failing fuel pump relay, a worn wiring harness connector at the tank, or a weak ground can cause low voltage to the pump. Low voltage makes the pump run slow and overheat, which shortens its life.
Heat: The 2016 Ram 1500 5.7 operates in a wide range of climates. In hot states, under-hood and in-tank temperatures add stress to the pump over time.
3. Fuel Pump Replacement Options for the 2016 Ram 1500 5.7
When it is time to replace the 2016 Ram 1500 5.7 fuel pump, you have three main choices.
1. Mopar OEM pump from the dealer: This is the factory part. It fits correctly and performs like the original. The trade-off is price—dealer parts are usually the most expensive option.
2. Aftermarket replacement module: Many brands make a complete in-tank module for the 2016 Ram 1500 5.7. A good aftermarket unit includes the pump, sending unit, strainer, and seals in one assembly. This is the most popular choice because it balances cost and reliability.
3. Pump motor only (repair kit): You can buy just the pump motor and rebuild the original module. This is cheaper in parts, but it requires more labor and more care. If the housing, fuel level sender, or wiring is also worn, a full module is the better value.
For most owners, a complete module is the practical answer. It drops into the tank as one piece, restores fuel pressure, and gives you a new fuel level sender at the same time.
4. What to Look for in a Replacement Fuel Pump
Not all replacement pumps are equal. Before you buy, check these points.
Correct fit for the 5.7L HEMI: Confirm the part is listed for the 2016 Ram 1500 with the 5.7 engine, the correct cab/bed configuration, and the correct fuel tank size. The 2016 Ram 1500 came with different tank options, and the module must match.
Complete assembly: Look for a unit that includes the pump, strainer, fuel pressure regulator (if applicable), seal/gasket, and sending unit. A complete kit avoids extra trips to the parts store.
Flow rate and pressure specs: The replacement must meet or exceed the factory fuel pressure and volume for the 5.7 HEMI. A pump that flows too little will cause lean running and hesitation.
Warranty: A strong warranty shows the manufacturer stands behind the part. Long coverage is a sign of confidence in quality.
Brand reputation: Choose a brand with a track record in fuel delivery parts, not the cheapest no-name unit you can find. A failed pump means dropping the tank again, which is not a job you want to repeat.
5. Step-by-Step: Replacing the 2016 Ram 1500 5.7 Fuel Pump
This is a general overview. Always follow a service manual for your exact truck and use safe practices when working with fuel.
1. Relieve fuel system pressure and disconnect the battery. Remove the fuel pump fuse or relay and crank the engine briefly to release pressure. Disconnect the negative battery cable before you start.
2. Drain or lower the fuel tank. Work with a near-empty tank if possible. Support the tank with a jack, then remove the tank straps and lower it carefully. On some 2016 Ram 1500 models, the tank must come down to access the pump module on top.
3. Disconnect the fuel lines and electrical connector. Label or note the line routing. Release the quick-connect fittings with the correct tool. Unplug the wiring harness from the module.
4. Remove the locking ring. Use a spanner wrench or a brass punch and hammer to turn the lock ring counterclockwise. Be careful not to damage the ring or the tank flange.
5. Lift out the old module. Pull the assembly straight up and out. Note the orientation of the float arm and the strainer so the new unit goes in the same way.
6. Install the new module. Place the new seal/gasket on the tank opening. Lower the new module in, aligning it as the old one was. Make sure the float arm is not bent.
7. Reinstall the lock ring. Turn it clockwise until it is tight and seated. Tap it gently to fully seat the tabs.
8. Reconnect lines and wiring, then raise the tank. Reattach the fuel lines and harness, raise the tank into place, and torque the straps to spec.
9. Reconnect the battery and test. Turn the key to "on" and listen for the pump to prime for about two seconds. Check for leaks at the connections. Start the engine and verify smooth idle and proper fuel pressure.
10. Clear codes and road test. Clear any stored diagnostic codes, then drive the truck under normal and heavy load to confirm the hesitation or stalling is gone.
If you are not comfortable working with fuel or supporting a heavy tank, have a professional do the job. Fuel is flammable, and a dropped tank is dangerous.
6. Cost Expectations for a 2016 Ram 1500 5.7 Fuel Pump
Costs vary by location and part brand.
Parts only: A quality aftermarket module for the 2016 Ram 1500 5.7 typically runs in the range of a few hundred dollars. A Mopar dealer part costs more.
Professional labor: Because the tank usually has to be lowered, labor is the larger part of the bill. Many shops charge several hours of labor for this job.
Total at a shop: Expect the full job with parts and labor to land in a mid-to-high range depending on where you live and what part you choose.
Do it yourself: If you have the tools, a safe place to work, and the ability to lower the tank, doing it yourself saves the labor cost. The main risk is safety around fuel and a heavy tank.
7. How to Make the New Fuel Pump Last Longer
Once you install a new 2016 Ram 1500 5.7 fuel pump, protect your investment.
Keep the tank at least a quarter full. This keeps the pump submerged and cool.
Replace the fuel filter if your truck has one. A clogged filter forces the pump to work harder.
Buy fuel from busy, reputable stations. High-volume stations are less likely to have water or sediment in their tanks.
Fix electrical problems right away. A bad relay or corroded connector will damage a new pump just like the old one.
Do not ignore early symptoms. If the truck starts hard once, check it. Catching a weak pump early prevents a no-start situation and possible damage to other parts.
8. Recommended Brand: KEMSO Fuel Pumps
When you are choosing a replacement for the 2016 Ram 1500 5.7 fuel pump, we recommend buying a KEMSO brand fuel pump. KEMSO fuel pumps are built as high-performance units and are designed as a direct OEM replacement, so they fit your 2016 Ram 1500 5.7 without modification and meet the fuel delivery demands of the 5.7L HEMI engine.
Every KEMSO fuel pump is backed by a lifetime warranty, which means the company stands behind the product for as long as you own it. That level of coverage is rare in the aftermarket and gives you real peace of mind on a job that requires dropping the fuel tank.
If you want a high-performance, OEM-replacement fuel pump with a lifetime warranty for your 2016 Ram 1500 5.7, visit KEMSO at https://www.kemsoracing.com/ to find the correct part for your truck. Their catalog covers the 2016 Ram 1500 5.7 application, and buying direct ensures you get the right module the first time.
9. Final Thoughts
The 2016 Ram 1500 5.7 fuel pump is a part that will eventually wear out, and the symptoms—hard starts, stalling, power loss, and no-start conditions—are easy to recognize once you know what to look for. Replacing the complete in-tank module with a high-quality unit is the most reliable fix. Confirm the fit for your exact truck, choose a pump that meets factory fuel pressure and flow, and protect the new unit by keeping the tank filled and the fuel system clean.
For a dependable, high-performance, OEM-replacement option with a lifetime warranty, KEMSO is the brand to look at. See the full selection for your 2016 Ram 1500 5.7 here: https://www.kemsoracing.com/