Both of these issues can be prevented buy upgrade the lift pump system to either an AirDog or FASS system. The two most common things that will void your warranty are fuel contamination and inadequate fuel pressure. Thoroughbred’s warranty on VP44 is 1 year unlimited miles. What is Thoroughbred’s Warranty on a VP44 injection pump? However on some items we do still require an upfront core charge. On replacement parts that our customers order frequently we have taken steps to prevent core charges up front.
The wire that is closest to the engine and connects to the PSG is the wire that needs to be taped for installation of some modules.Ĭlick here to see how to tap a VP44 Injection Pump in our video using a BD Diesel Stealth Cover! > Does Thoroughbred Diesel Charge for Cores Up Front? This computer portion is known as the PSG. There are two wires running from the back of the pump up to the computer portion on the top of the pump. What Wire Do I Tap on a VP44 Injection Pump? If the last two digits are not a multiple of 7 then it will be a 15x pump. If the pump is on a light duty dodge cummins pickup, and the last two digits are a multiple of 7, then the pump is a 17x. The last two digits of this number are the identifiers of the type of pump. The first 8 digits of this number should read 04705060. On this tag there will a 10 digit Bosch number that is stamped into the metal.
How Do I Tell If I Have a 17x or 15x VP44Įvery Bosch manufactured pump has data tag on one side of the pump, driver’s side when located on vehicle. We would recommend going with a mild tuner such as the Edge EZ which will give you the extra horsepower and should help to increase fuel economy without any of the side effects associated with the Hot Rod VP44. Yes it is very tempting to upgrade your injection pump and get the extra HP, but there are more effective ways to gain 50 extra horsepower on a stock truck. However, for the majority of our customers, you should not upgrade. If you are planning to upgrade your injectors, then yes, you should upgrade to a Hot Rod VP44. The extra pressure is can also cause issue on stock injectors, which is why Thoroughbred only recommends using a Hot Rod VP44 if you have upgraded injectors design for a higher flow rate. Using a Hot Rod VP44 on a stock truck will cause the truck to have a very rough idle due to the extra pressure the pump is producing. We don’t recommend it, however it is possible. Will a Hot Rod VP44 injection pump Work On a Stock Truck? If the computer meets all of the Bosch qualifications then it is reused. If the computer does not meet every single one of the qualifications mandated by Bosch then the entire computer is replaced regardless of the failed qualification. Does Thoroughbred Diesel’s VP44s have new computers (PSG)?īefore a VP44 is rebuilt the computer portion is removed and tested. You we also need a couple of bolts meeting those specs. The threaded holes on the gear are M8 x 1.25. Thoroughbred recommends going to your local parts store and purchasing steering wheel removal tool. Our injection pumps do not come with a removal tool.
Do the Injection Pumps Come With a Removal Tool? Due to the need of a core, there is no such thing as a completely new VP44, even though some are advertised as such. Therefore at this time ALL VP44 injection pumps require a used housing, also known as core, to be rebuilt. Are Thoroughbred Diesel’s VP44 Injection Pumps New or Rebuilt?īosch is no longer casting housing’s for the VP44 injection pump. For trucks ranging in year 99.5-2002 fuel pressure should be checked at the Schrader located on the side of the VP44. 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. 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. This method will vary depending on what truck year you have. How Do I Check Lift Pump Pressure to the VP44? Our recommendation for optimum fuel pressure is 12 PSI of the VP 44. 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. Some pumps will be able to run higher than that but Thoroughbred Diesel does not recommend it. This VP44 diaphragm works best under pressures between 10 and 15 PSI. There is a diaphragm located inside the VP44 injection pump that is very sensitive. How much Fuel Pressure Should the VP44 Injection Pump Regularly Receive?