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. Hard starts, as they relate to VP44 injection pump problems, are caused by lack of fuel or over pressurization by the lift pump. When this problem occurs you will usually experience intermittent hard starts, white smoke and what’s usually referred to as “The Dead Pedal”. Lack of fuel is again part of the problem, because the VP44 is cooled with fuel instead of oil (as the old P7100 12valve pumps). Heat is the main reason associated with this problem, causing the soldered components to become crystallized over time and make bad connections. The last reason for the failure of the VP44 pump is electrical problems with the computer on top of the pump. If the rotor seizes the truck will not start and the VP44 Injection Pump must be replaced. If you are hitting high RPMs down the road and this is happening, you are not getting the lubrication your pump needs and you are likewise going to run into problems. Diesel Fuel is used as a lubricant, so when there is an insufficient amount of fuel the rotor does not get lubricated properly. A seized rotor can be contributed to the lift pump not providing enough fuel to the injection pump. This is a problem in the machining, but has been phased out in later years of production. According to Bosch this failure is a poorly “de-burred” rotor. This mechanical failure of the VP44 is located in the head of the pump and is a communal problem that has plagued the Cummins engines for a long time. What is wrong with my VP44, truck will not start or has white smoke? Dead PedalĪ seized rotor is a common problem with 98-99 trucks or ones with a rebuilt pump without an upgraded rotor, coating, and distributor. The average cost of having the lift pump put in the tank is about $800. Dodge has recognized this problem as they will no longer even sell the lift pump that goes on the side of the block they replace it with a unit that is now mounted in the tank. When the lift pump does not supply the Injection pump with the correct amount of Fuel Pressure (a minimum of 5psi under load at wide open throttle) the diaphragm then doesn’t have enough positive pressure and ruptures. The rupturing of the diaphragm is caused by a poorly designed lift pump. When this occurs your Bosch VP44 Injection Pump must be replaced.
#DURAMAX FASS PUMP STOPPED WORKING CODE#
This will cause the dreaded check engine trouble code P0216. The diaphragm ruptures allowing the timing piston to vibrate and damage the front cover until fuel bypasses.
The most common mechanical failure of the VP44 pump is rupturing of the diaphragm in the front of the injection pump. What is wrong with my VP44 fuel pump? Trouble code P0216 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.
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. This lack of fuel results in one of two types of failure within the VP44. 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. Unlike most injection pumps the VP44 is fuel cooled and lubricated. Dodge trucks 98.5 and up are notorious for having weak lift pumps. The most common cause of VP44 failure is to lack of fuel. What caused my VP44 pump to fail? How common are VP44 injection pump problems? The fuel pump then varies the timing relative to your Cummins engine speed. As the diesel fuel moves through the VP44 it is distributing the high-pressure, metered fuel to each cylinder at the precise time. The pump also meters the exact amount of fuel for each injection cycle. It first produces the high fuel pressure required for fuel injection.
The fuel injection pump (VP44) is an electronic rotary distributor pump. Lets learn more about VP44 pumps below! What is a VP44 injection pump? Not to worry though! Diesel Addict will arm with the most information possible to make the problem a piece of cake. Sadly every 98-02 Dodge Cummins engine is destined to have a problem with the vp44 sometime in it’s life.
#DURAMAX FASS PUMP STOPPED WORKING HOW TO#
Before we delve into how to find and solve vp44 injection pump problems, we need to learn a little more about the VP44 pump itself.
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