What causes a VP44 injection pump to go bad?
What causes a VP44 injection pump to go bad?
Hard starts, as they relate to VP44 injection pump problems, 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.
How does the VP44 fuel pump work on a Cummins Engine?
It first produces the high fuel pressure required for fuel injection. The pump also meters the exact amount of fuel for each injection cycle. As the diesel fuel moves through the VP44 it is distributing the high-pressure, metered fuel to each cylinder at the precise time. The fuel pump then varies the timing relative to your Cummins engine speed.
Why does my Bosch VP44 pump need to be replaced?
The diaphragm ruptures allowing the timing piston to vibrate and damage the front cover until fuel bypasses. This will cause the dreaded check engine trouble code P0216. When this occurs your Bosch VP44 Injection Pump must be replaced.
What should the lift pump pressure be on a VP44?
Be sure that you have at least 5 PSI Lift Pump pressure UNDER LOAD at all times, to be sure low lift pump pressure isn’t preventing full power or timing advance, and or causing any harm to the old style diaphragm in the VP44.
What happens if the lift pump on a VP44 fails?
Being that the VP44 relies on adequate fuel supply pressure and volume in order to operate, lubricate and keep it cool, a failing lift pump can spell disaster. Unfortunately, lift pump failure runs rampant on ’98.5-’02 Dodges.
How does the VP44 fuel injection pump work?
The pump performs four basic functions. It first produces the high fuel pressure required for fuel injection. The pump also meters the exact amount of fuel for each injection cycle. As the diesel fuel moves through the VP44 it is distributing the high-pressure, metered fuel to each cylinder at the precise time.
What to do if your VP44 is not getting fuel?
The factory fix was to replace the lift pump with an in-tank unit, and while that helped it didn’t provide the kind of reliability most customers expected. Bottom line: If the VP44 is not seeing at least 5 psi of fuel supply from the lift pump, it will not be happy.
The diaphragm ruptures allowing the timing piston to vibrate and damage the front cover until fuel bypasses. This will cause the dreaded check engine trouble code P0216. When this occurs your Bosch VP44 Injection Pump must be replaced.
