VP44 Pump (12 Month Warranty) - Fits HD Midrange Freightliner/AG

Thoroughbred Sku #: TDP16XVP441YR-CRE


NOTE: There is a $200 charge if you purchase a 17X pump and send in a 15X pump.

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Product Details

Product Name: Bosch VP44 Injector Pump (12 Month Warranty)
Manufacturer: VP44
Manufacturer Part #: 16XVP441YR
Thoroughbred Diesel Part #: TDP16XVP441YR
Fitment Notes: NON-Dodge Trucks (HD Midrange Freightliner/AG)

All of our VP44 injection pumps come with a 1 year, unlimited mileage warranty. Experienced diesel company that has installed many VP44 pumps. Call us toll free at 866-737-4966 with any questions or concerns. No hassle rebates to deal with! Our Pumps come with a One Year, Unlimited Mile Warranty. Thoroughbred 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.

*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.

VP44 Warranty Information
If you have an issue with your VP44 pump, please review the following information.
  • Contact Thoroughbred Diesel to discuss the issue with your pump.
  • The Warranty of the VP44 pump is controlled by the Manufacturer of the VP44, not Thoroughbred Diesel. The Manufacturer makes all decisions about the warranty of this pump.
  • Thoroughbred Diesel is here to assist the customer in obtaining the proper RMA# from the manufacturer to start the Warranty Process.
  • Thoroughbred Diesel nor the VP44 Manufacturer will not reimburse labor or installation fees under any circumstance
  • Reasons your pump will NOT be covered by warranty:
    Improper installation - (Ex. Smashed keyway, cracked housing, etc)
    Fuel Contamination
    Improperly tapped PSG Wire
  • Thoroughbred Diesel will oversee the warranty process and be in contact with the customer. Any findings deemed to be manufacturer defects will be covered under warranty and returned to the customer in a timely manner


  • How Do I Check Lift Pump Pressure to the VP44?

    Eric Schumann | 5/16/2019

    This method will vary depending on what year your truck is. If you have a 98.5-99 Cummins there will be a 1/8 by 27 NPT port on top of the fuel filter housing. For this year truck, this is the most accurate place to insert your fuel pressure sensor to read the pressure supplied by your lift pump. For trucks ranging in year 99.5-2002 fuel pressure should be checked at the Schrader valve located on the side of the VP44.

  • What is the Cause Of Hard Starts?

    Eric Schumann | 5/16/2019

    Hard starts as they relate to VP44 injections pumps are caused by lack of fuel or over pressurization by the lift pump. If a lift pump is going bad and failing to supply the proper amount of fuel to the injection pump, then the truck will hard start due to lack of fuel. However, a newly installed lift pump that is pushing over 15 PSI to the VP44 can also cause hard starts. The VP44 is a very sensitive pump and needs approx. 12 PSI to run properly. Once you start getting about 15 PSI to the injection pump, you actually start to over pressurize the pump causing it to act as if you had a flooded engine.

  • What Wire Do I Tap on a VP44?

    Eric Schumann | 5/16/2019

    There are two wires running from the back of the pump up to the computer portion on the top of the pump. This computer portion is known as the PSG. The wire that is closest to the engine and connects to the PSG is the wire that needs to be tapped for installation of some modules. Keep in mind that tapping this wire will void the warranty on your VP44. Thoroughbred Diesel recommends installing a BD stealth cover instead of notching the tap wire directly.

  • How much Fuel Pressure Should the VP44 Receive?

    Eric Schumann | 5/16/2019

    There is a diaphragm inside the VP44 that is somewhat sensitive. This particular diaphragm works best under pressures between 10 and 15 PSI. Some pumps will be able to run higher than that but we don't recommend it. After changing your VP44, if you notice continued hard starting or feel as though the pump is getting bogged down, it is probably time to check the lift pump pressure. Our recommendation for optimum fuel pressure is 12 PSI of the VP44.

  • What caused my VP44 to Fail? Is this a Common Problem?

    Eric Schumann | 5/16/2019

    The most common cause of VP44 failure is lack of fuel. Dodge trucks 98.5 and up are notorious for having weak lift pumps. Unlike most injection pumps, the VP44 is fuel cooled and lubricated. Therefore, if its fuel supply comes from a weak lift pump, it is very easy for the VP44 to overheat and cause damage to itself. This lack of fuel results in one of two types of failure within the VP44. One is that the diaphragm inside of the pump is damaged and does not allow the pump to build up the appropriate amount of pressure. The second is that the overheating causes the computer portion of the pump to also overheat and thus, creates a communication failure between the ECM and the Injection pump.

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