How does a Bosch VP44 pump work?
What is the VP44 and how does it work? The VP44 fuel pump is an electronically controlled rotary fuel injection pump; the pump controls the injection quantity & timing of the fuel injection. The pump control unit (PCU) controls the timer control valve (TCV) rotor solenoid and receives signal from the pump speed sensor.
How much does a VP44 cost?
VP44 acting up, throwing codes. Got a price of $600 labor and $1546 for a reman pump from Dodge dealer.
Why do VP44 pumps fail?
The most common cause of VP44 failure is to 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.
Can you adjust a VP44 injection pump?
As far as I know, there is no “adjustment” on the VP44. Tweaking is usually done with a module or programmer of some sort.
How much psi can a VP44 handle?
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.
How do I know if my VP44 is weak?
Your symptoms of not starting when hot, and starting fine after it cools off, is a sign the vp44 pump is bad. The correct way to be sure is to have someone install the Cummins bypass harness on your vp44 when it’s hot and not starting. If it still doesn’t start, replace the vp44.
How long does it take to change a VP44 pump?
How to remove the VP44 the quick and easy way. Takes approximately 45 minutes for me to do this much. Using a 10mm socket remove the air horn bolts and dipstick bolt. Using a 7/16 or 11mm loosen the top clamp of the boost boot.
How long does it take to replace a VP44 pump?
Takes approximately 45 minutes for me to remove the VP44 Injection pump. Using a 10mm socket remove the four air horn bolts and one dipstick bolt. Using a 7/16 or 11mm socket loosen the top clamp of the intake boot. Move the grid heater and intake horn out of your way.
How do you bleed a VP44 injection pump?
Thoroughly clean area around injector fittings where they join injector connector tubes. Bleed air by loosening high-pressure fuel line fittings at cylinders number 3, 4 and 5. Continue bleeding injectors until engine runs smoothly. It may take a few minutes for the engine to run smooth.
How do you hotwire a VP44 injection pump?
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- Disconnect the VP44 wiring harness connector completely.
- Connect pin 6 on the VP44 to battery ground.
- Connect pin 7 on the VP44 to battery positive.
- A diagram of the sockets on the VP44 wiring harness connector is included below.
- As soon as you make the last connection the VP44 , it will be ON and ready to go.
How many GPH does a VP44 need?
So ultimately it suggested having a fuel system of no less than 100 GPH supply that can maintain a minimum pressure of 14-15 PSI at WOT . This will great extend the life of the VP44 because it keeps the electronics cooler longer and keeps the rotating parts lubricated properly.
What are the functions of a VP44 pump?
The fuel injection pump (VP44) is an electronic rotary distributor pump. The pump performs four basic functions: Producing the high fuel pressure required for injection Metering the exact amount of fuel for each injection cycle Distributing the high-pressure, metered fuel to each cylinder at the precise time
Can a Bosch VP44 diesel pump be replaced?
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.
Is there a warranty on a VP44 injection pump?
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.
What are the functions of a Bosch injector pump?
The pump performs four basic functions: Producing the high fuel pressure required for injection Metering the exact amount of fuel for each injection cycle Distributing the high-pressure, metered fuel to each cylinder at the precise time Varying the timing relative to engine speed.