Bosch VP44 Injection Pump Cummins Application Disassembly and Reassembly

Disassembly and reassembly of a Bosch VP44 injection pump from a Cummins application. We show what the common parts look like and the common failures. The notes below dive deeper into the details of part failure causes and how to avoid them.
• If the PSG (pump mounted electronic control unit) to fuel control solenoid wires are damaged, we replace the PSG assembly
• A cracked diaphragm is caused by air in the fuel, or aerated fuel. Aerated fuel is caused by low or no engine supply pump, or lift pump pressure, plugged filter, running out of fuel etc.
• Housing advance bore damage and timing piston damage are also caused by aerated fuel. A sticky advance will not operate properly and is one cause for a P0216 code.
• Inside the pump, the pumping plungers deliver fuel by loading on the cam. The cam is moved by the timing piston, to advance the timing. If the fuel in the pump has air in it, every time the pumping plungers load on the cam, it compresses the air fuel mix behind the advance piston and causes the advance piston to slam toward the retarded side. While driving at 2000 rpm, then pump turns 1000 rpm, and the plungers load on the cam 6 times for every revolution. That means the timing piston slams retarded 6000 times per minute. It is amazing they last as long as they do with air in the fuel.
• Inside the pump, the supply pump pressurizes the fuel to operate the advance and feed the fuel control solenoid, which delivers fuel to the injectors. If the supply pump is worn, it can cause hard starting, particularly if the engine lift pump creates too much pressure (15 or more psi) at cranking.
• We check lift pump pressure with a gauge during WOT acceleration, instead of a volume test. The supply pump in the pump pulls fuel, and the lift pump on the engine pushes fuel. If the lift pump can't keep up, the pressure will drop. We consider 4 psi a minimum pressure and 8 psi to start watching the pressure. Aeration of the fuel is created by negative pressure, or cavitation.
VP44 Removal and Re-installation Video • Dodge Cummins VP44 Bos...
VP44 Calibration and Testing video • Testing a Bosch VP44 P...
oregonfuelinjection.com
/ oregonfuelinjection

[@bannana6290]

omg thats my pump ty

[@ferreirasouza5792]

Amazing job

[@codures]

Hi, impressive work you're doing there folks. I have question : at

[@PeterFokuoMensah-so8qw]

It helpful thanks,have this question if a car doesn’t have good sound and is able to start what might be wrong in the car? I need help pls

[@jeanl1443]

Hi, I find a calculator for static test. Witout car. For exemple 800tr min and 1800tr min for runing test. Regards

[@joefeatherstone9646]

How is it those diagrams crack? The new ones are steel with a rubber or plastic coating are they not? I thought only the early pumps had plastic diaphragms.

[@playerguy1232]

I wish I could send it to you guys mine🥺

[@voodorun]

How did you fix a Timing Piston housing damage?

[@Th3XC45T]

i have an odd question. my vp44 will not seal where the computer plugs in. i take off the 5 (5 point security bits) and the 3 others. made sure the surface was clean installed the new o rings and it leaks through the mounting bolts. do you know of any methods to get this to seal. i have countless times. the reply will be appreciated. the part in question is the first thing removed in this video

[@reloadkTV]

how do you clean the pump?

[@enahouwa3811]

Code Défaut 0077 !!?

[@tommyduris3044]

Hi, Great vid thanks 👍 Just wanted to ask I have a Bosch VP44 059130106K 0470506038 and need a diaphragm and can't find one. Apparently it's unavailable... Can you please advise where I could get one from? I was also told I need new rollers & clamps, which funny enough are also unavailable. Is there any way by my model number you could please confirm if these parts are in fact available to buy and from where? Thank you again. It's for a 2.5 TDI 120kW