VE Pump Vs P Pump: Things You Should Know

Is there any difference between the VE pump and the P pump? Well, of course! VE and P-pump differ in several ways, including plunger numbers, injection mechanisms, and timing. These variations affect power delivery, fuel efficiency, and engine performance.

The versatility of the Cummins diesel engine has been proven, making it ideal for various modifications. The pump mod is one of them. So, the VE pump vs P pump debate arises to find the best pump for Cummins.

However, it’s crucial to comprehend the results and prerequisite performance from Cummins before installing those. In this article, you will discover which pump is best for your demand and how those differ in the engine.

VE Pump Vs P Pump

There has been a revolution in the Cummins fuel injection pump systems. To ensure your investment in swapping the injection pumps, you must first know the VE vs P-Pump.

Key Point VE-PumpP-Pump
Pump TypeMechanical injection distributor type (rotary pump)Mechanical inline pump (common rail injection type)
Power DeliveryCan produce Less horsepowerCan produce higher horsepower
Number of PlungersSingle or three pumping plungers (distributor plunger)Six pumping plungers
Fuel Pumping SpeedTakes more time to pumpTakes less time to pump
DurabilityLess durableMore durable(made up of cast aluminum, cast iron, or steel)

Differences in the Fuel Pumping Mechanism

Axial-piston rotary pump with mechanical control is used by the VE injection pump. It produces an internal pump pressure that rises with engine speed using a vane-type feeding pump.

Its rotational shaft and distributor plunger delivers the injection pressure and regulates the injection time. The pump’s body contains six different delivery valves that link it to the injectors.

On the other hand, multiple plunger-and-barrel assemblies are used in P-pumps. The six pumping plungers move up and down in their chambers as the pump’s camshaft spins. These six distinct plungers provide the injection pressure, and the pump’s camshaft controls the firing sequence.

Engine Performance

If you want long-term reliable service with decent power delivery, then the VE pumps are a good choice for Cummins. The VE pumps have been serving 5.9 L Cummins engines from 1989-1998.

Due to a slower yet continuous fuel injection system, the engine cannot produce more horsepower higher than 160. The highest power delivered by a VE-pump-based engine is 200 only.

But in the P-pumps, the six discrete plungers make it a quick injection to the engine without any loss. It can be used with any modern 24-valve diesel engine.

Better time monitoring and swift injection by the P-pump enable the engine to produce over 500 horsepower conveniently. Therefore if you are confused between the VE pump or P pump, you may choose the P-pump for power.

Free-of-cost Modifications in the Pumps

The VE engines are suitable for easy and free mods. You can tweak the pump by setting the highest fuel nut. This screw is also known as the “smoke screw”, which helps with minimal engine boost driveability by introducing fuel earlier in the rpm range.

All you need is two screwdrivers, a 13-mm socket, and a socket of T-25. You must remove the small locking cap above the fuel management mechanism to reach the Torx screw and 13-mm lock screw.

With just basic tools and the P-pumps, it is possible to unleash up to 100 horsepower in a 6BT setup. These low-cost modifications involve sliding the AFC housing of the pump entirely forward.

This will increase the P-fueling pump’s rate at a low boost. Completely removing the gasoline plate from the pump, which lengthens the rack travel, has been known to add 30 to 40 horsepower quite effortlessly.

Injection Timing Comparison

The effective timing parameter of a VE pump is well acknowledged. The pump’s timing will adjust depending on RPM to give a more rounded power spectrum.

Trucks can start more readily as a result, and they are also less loud when running. This is because a vehicle with perfect tuning will function at the proper timing across the whole RPM range.

The factory default setting for many P-pumps was about 12 degrees of advancement, but extending injection time to 17 to 20 degrees has a significant impact on horsepower, ride quality, and exhaust gas temperature (EGT) reduction.

A Helpful Tutorial You May Need!

Frequently Asked Questions (FAQs)

What does P-pump mean?

The P-pump is a mechanical inline type pump that directly feeds the fuel to the fuel rails of the injection system. Unlike the VE pumps, P-pumps have six independent plungers, which enhance the injection time, and fuel ratio and increase the engine’s power with effectiveness.

What is a VE pump?

The “V” of the VE stands for “Distributor,” and the word “Rotary Pump” is derived from “Faire Tyler.” Hence a VE pump is a mechanical rotary pump. It is more fuel economic and has a longer lifespan for a better and more reliable driveability of a diesel engine.

How much HP can a VE pump make?

A VE pump can generally produce around 150-160 horsepower. But with some modifications and tweaks, it enables the engine to enhance the power delivery up to 200 horsepower. But due to some factory limitations, producing more than 200HP is not possible in VE pumps.

How do you time a VE pump?

To boost the timing in a VE pump, the four bolts in the injection pumps need to be loosened at first. After that, rotate the pump counterclockwise towards the cylinder hood.

What is the difference between an inline pump and a rotary pump?

The output lines of a rotary pump are circular, while those of an inline pump are entirely straight. An inline gas pump operates independently from the others, allowing each cylinder to fail on its own. However, the barrels in rotary pumps function independently and fail concurrently.


Owning a Dodge Ram comes with a lot of flexibility, including tuning the engine according to your driving demand. Understanding the VE injection pump vs P pump comparison may help you get more power, reliability, or better mileage from your Cummins.

That said, choosing the right injection pump for modifying the Cummins can be difficult for a beginner. Also, if the pumps do not function as expected, it could be a waste of money.

We hope this VE pump vs P pump comparison guide has been informative to you. Additionally, it will assist you in making sensible decisions and wise investments for Cummins modification.

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