LML lift pump

[FSUwelder1212]

The way the previous comment made it sound was that someone actually showed up to inspect, (me assuming).. Yes they always asked for warranty parts back, CP4s, AFM lifter failures, 3.6 timing chain issues, etc etc. Never had a CP4/fuel system get denied warranty though. (Never did a fuel system on a not factory stock LML though)

I said "typically" because it does happen, sometimes the supplier will go to the vehicle for investigation but it is extremely rare. I wouldn't count on anyone showing up to look at a CP4 at this point, but I would bet GM will direct the tech to look for evidence of modification or water in the system, anything to weasel out of it, especially if Bosch is fighting their warranty concerns.

 

[036.6turbo]

Never had an agent come to the dealer I worked at for CP4 failures and I did more than I like to remember.

That's not typically how it works, GM will do the work then send the part off to the supplier for inspection and root cause investigation under a warranty concern. Then the supplier makes the call on whether to fight it or not. More often than not the supplier will bend to the will of the oem even if the issue is not a defective part so as not to piss off the oem. It sounds like Bosch may actually be standing up for themselves.

If Bosch can prove that failures are occurring due to a GM system design flaw e.g. poor filtration, lack of lift pump, etc. They have a case to fight the claims. It does seem the ford 6.7 has a lower failure/warranty rate although I don't have any data to compare the two.

Sent from my SAMSUNG-SM-G935A using Tapatalk

I could have misunderstood how he explained it to me, but he did say the parts were examined. He also said that it was very common for them to find gasoline and or water in a failed CP4.

I was trying to get his opinion as to whether or not I should convert my LML to a CP3, (rebuilt title, no warranty). He said leave the CP4, and add lift pump and delete all emissions.

His title at work is;
"DMAX Quality Resident - Flint and Ft Wayne Vehicle Assembly Plants
Reliability Engineering"

So I may just listen to him.

 

[nick31]

if your cp4 takes a dump with your lift pump on just remove it quick before you have the truck hauled in to the dealership...theres no way they are going to know you had one on the truck, and it's easy to remove it and plug the factory lines back in how they are stock