If a mechanic is out of the question, then installing a quality lift pump would be my first recommendation. Installing a lift pump may help fix the symptom and is a good modification for the future even if a new CP3 is needed. Approximate time for the DIY’er would be 6-10 hours. The CP3 doesn’t need to be timed to the cam.
The mechanically inclined person can do this job, no specialty tools are needed but patience and time. The cost for parts alone will be $800.00-$1000.00 without installation. I recommend having a qualified mechanic diagnosis this pump if the above repairs have not fixed the low rail pressure problem. This is a big job to do as the CP3 is gear driven off of the camshaft and is located in the valley of the engine. This CP3 is under high demand, sucking fuel from the tank through the filter and then converting this to pressures up to 26,000 psi.It is a mechanical pump and does wear with use. If the truck has had a lift pump (electronic pusher pump) and/or correct fuel filter changes, then this can be greatly extended. We see this start to rear its ugly head at an average of 175,000 miles depending on the history of the vehicle. Cost: is less than $20.00 unless the pickup/sending unit is damaged. Tools needed: fuel line quick disconnect kit, can be the cheap plastic ones sold at the local parts store. Inspect the unit as well as the fuel tank and remove the offending particles or repair the separated pickup tube. The fuel sending/pickup unit will then need to be pulled out. Run the fuel level down as much as possible, then the tank will have to be dropped. This is not a fun job but is not too difficult. The most common thing we see is the paper seals of diesel fuel additive.
The common cause is a foreign object gets down the filler neck of the fuel tank. Remove the fuel line and find a suitable replacement at the local auto parts store, making sure the line is rated for diesel fuel. The fuel line can be replaced if the filter change doesn’t fix the problem. If not cracked, the problem is usually fixed by replacing the filter. This is usually caused from a plugged fuel filter causing a major vacuum between the filter head and the cp3.
#2006 duramax fass pump cracked#
If any fuel is leaking past the fprv, then the internal spring will need to be shimmed. This can be tested by doing the “bottle test” This is an easy, cheap way to see if the fprv is leaking. Weak fuel pressure relief valve (fprv) for 2004.5-2010 model years.Common hand tools are all that is needed. sells an inexpensive rebuild kit complete with filter and instructions to repair this important part.The water separator screws into the bottom of the filter itself and must be replaced if cracked or damaged. Leaking fuel filter head, or cracked water separator.The filter head is the part that the fuel filter screws into and has the primer plunger incorporated into it.There are O-rings and seals that break down with age and use.When in doubt, change the filter! This is about a 30 minute job that can be done without any special tools. The filter should be changed in the 8,000-10,000 mile range if good fuel is being purchased and running mostly low HP tuning, much sooner if running competition/race style tuning.
Dirty fuel filter is the most common issue we see when fuel rail pressure is low.May include one or all and not limited to Low power, poor shifting quality, excessive smoke, engine limp mode, reduced mpg. This may only happen in high fuel demand situations like towing or racing but it can also happen with everyday use. This is a very common problem that we hear about from our Duramax customers.Īctual fuel rail pressure is not keeping up with desired fuel rail pressure. Low rail pressure may or may not cause an MIL (check engine light). DTC P1093, P0087 causing limp mode is common with this issue.
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