of our VP44 injection pumps come with a 1 year,
unlimited mileage warranty.
that has installed many VP44 pumps. Call us toll free at
with any questions or concerns.
Truck & VP44 Pump Below
of core:The core is the old unit, which was replaced
by the new or rebuilt item. Some new items, for example the
Alliant product line, require the return of the old core.
Cores must be like for like and include return valve.
If you return a different core there will be a $250
up charge. If your unsure which pump you need check to application
chart to cross reference you pumps part #. If you don't see
your part number please call 866-737-4966.
98.5-99 6 speed manual NON HO trucks need to call in at
866-737-4966 with your engine serial # to verify correct
call this pump a 15xwhich Fits:
1998.5-2002 Dodge Ram Cummins Auto/5 speed
call this pump a 17x which Fits:
2000-2002 Dodge Ram Cummins 6 speed Transmission
Trouble Codes (DTC) that mean your VP44 needs replaced:
P0216 (often referred to as the code of
death and most common code for VP44 pump failure)
P0251 - P0260
Diesel offers replacement Bosch
Vp44 Fuel Injection Pumps that have been
rebuilt by certified Bosch tech and have been tested on a test
stand for 4hrs before the pump is sent to you. Bosch
VP 44 diesel pumps are also upgraded with all the latest
upgrades required by Bosch. Our VP44 injection pumps
come with a 1yr unlimited mileage warranty.
Thoroughbred Diesel also offers several replacement lift
pumps, that are better quality than what comes from the factory.
If you are placing performance parts on your truck it is highly
recommended that you use a performance lift pump such as the
Airdog or Fass Fuel Systems. A Airdog or Fass Fuel System
will supply the Injection pump with the fuel pressure that
is need no matter what performance upgrades you have on your
truck. We also offer several different gauge options from
Autometer and Isspro to monitor your fuel pressure so you
know when your lift pump is going out and can fix the problem
before you lose your Injection Pump. The cheapest way to monitor
your fuel pressure would be BD’s early warning light.
Preventing problems before they occur is the best way to take
care of your truck.
The fuel injection pump (VP44) is an electronic rotary
distributor pump. The pump performs four basic functions:
the high fuel pressure required for injection
the exact amount of fuel for each injection cycle
the high-pressure, metered fuel to each cylinder at the
the timing relative to engine speed.
A cam ring
with three plungers, a rotor, and an electronically controlled
fueling solenoid valve is used to develop and distribute the
high pressure required for injection. A worn or damaged internal
transfer pump, plunger, or fueling valve can affect the pressure
and amount of fuel injected, thus reducing the power from the
engine. Generally, if the fuel injection pump is injecting fuel
from one outlet, it will deliver from all outlets. VP44 Timing
Principles Timing in the VP44 is controlled by an internal timing
piston coupled to a cam ring inside the pump. The timing piston
is moved by fuel pressure. The amount of fuel pressure in the
timing piston assembly housing is controlled by an internal
transfer pump and a pulsating timing solenoid valve. As pump
speed increases, the fuel pressure to the timing piston assembly
also increases. Based on the inputs from the fuel pump control
module (FPCM), the timing solenoid valve pulses to vary the
pressure to move the timing piston, which results in the cam
ring moving to the desired position to achieve the commanded
timing. The more pressure created by the internal transfer pump
and timing solenoid valve, the more the timing will advance;
therefore, timing range capability is increased at higher rpm's.
*Performance chip & add on disclaimer -
Tampering with the pumps wires can cause premature pump failure.
If the wires are cut the pump is no longer warrantable, and
any repairs that need to be made to the injection pump will
be the buyers responsibility. In the VP44 pump the fuel is used
to cool and lubricate the pump, and the tolerances between the
head and the rotor is very fine. Performance chip add on's affect
the cooling rate of the pump. The pump will become hotter due
to excessive RPM's from the chips programming. When the throttle
is backed off the fuel to the pump is reduced, and the pumps
cooling capabilities are greatly reduced. Since the pump is
hotter from the increased RPM's the rotor seizes in the head
and the pump fails. An alternative to cutting into the pumps
wires is to use a chip that plugs directly into the trucks ECM.
This approach will allow for an increase in HP while not excessively
heating the fuel pump.