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Topic Review (Newest First)
07-24-2015 12:41 PM
D45
Quote:
Originally Posted by ironmangq:32672186
Stock filter is 4micron with a coalescing water separator built in. Cat filter is also a good filter but has no water separator so you need the dual kit to get that function. IMHO the stock duramax filter setup is better than many

It might be better than some but it still doesn't meet Bosch's filtering and water stripping standards
07-24-2015 12:00 PM
ironmangq Stock filter is 4micron with a coalescing water separator built in. Cat filter is also a good filter but has no water separator so you need the dual kit to get that function. IMHO the stock duramax filter setup is better than many. The bigger issue is that fuel in the US sucks, bare minimum cetane rating (unless your in CA) and bare minimum lubricity which is why additives for lubrication work so well to extend the life of the parts.
07-24-2015 07:26 AM
monstermax Look guys this is not rocket science. After three of these trucks all doing the same thing it became apparent to me that with high mileage you get wear. The problem is the fuel system sucks on the Dmax. First thing you need to do is install the Cat dual filter with a lift pump. The cat filter is a 2 micron filtration system. Stock filter is 7 microns. Under 26,000 psi its like running a wet sandblaster through your fuel system mainly your injectors. After the filter install put in a clean set of new injectors. Problem solved
05-06-2014 11:56 AM
Rttoys
Quote:
Originally Posted by knaffie View Post
That's doing what GM should have done on these engines anyway.
These trucks should have had a lift pump from day one. Add a little bit of power, a little age and it's almost a must.
05-06-2014 09:43 AM
D45 Yeah I understand, no sense throwing more money into the truck if you don't plan on keeping it

Hope things work out and the truck stays running strong
05-06-2014 08:23 AM
knaffie
Quote:
Originally Posted by D45 View Post
I think the lift pump is also a partial band aid to a larger problem

I bet your CP3 is worn out

What about the injector tubes or cups? Injectors ever been removed from the truck?
Injectors have never been touched.

If my CP3 is "worn out," how could I accelerate from a dead stop to 100 MPH @ 26,000+ PSI 10+ times in a row (before the lift pump) without a single problem? I know very little about the inner workings of a CP3, but it seems like if it was "worn out" I wouldn't be able to do that. And testing a CP3 is just a pressure test, right? Well, I pass that with flying colors.

I'll tell you what I'm not going to do. I'm not going to throw thousands of dollars at this trying to figure out what the "real" cause is when there's nothing wrong with what I've done to fix it. If something else fails, I'll address it. Until then, my truck is running stronger than it ever has.

I'm not going to do what a guy at work did and keep taking my truck back to the dealer every couple weeks and let them keep throwing parts at it until they finally put the right one on and the problem goes away. He was $3500 into and the problem still wasn't fixed. When they finally replaced all the rubber fuel lines, the problem went away. $4500 total repairs that a $400 lift pump would have fixed. And IMO, that's not really a band-aid. That's doing what GM should have done on these engines anyway.
05-06-2014 07:57 AM
D45 I think the lift pump is also a partial band aid to a larger problem

I bet your CP3 is worn out

What about the injector tubes or cups? Injectors ever been removed from the truck?
05-06-2014 06:12 AM
knaffie
Quote:
Originally Posted by D45 View Post
Are you running a factory CP3?

If so how many miles ?
Yes. 105,000.
05-06-2014 06:10 AM
D45 Are you running a factory CP3?

If so how many miles ?
05-06-2014 02:49 AM
knaffie
Quote:
Originally Posted by brooks294x4 View Post
I'm interested to see what happens in the following weeks. I'm glad that your truck is not messing up at the moment, but I hate to tell ya that I think a lift pump is a band aid for your real problem. The pump is keeping extra fuel pressure and not letting your truck fail as it was before.
And the real problem is?

Sent from AutoGuide.com App
05-05-2014 08:24 PM
brooks294x4 I'm interested to see what happens in the following weeks. I'm glad that your truck is not messing up at the moment, but I hate to tell ya that I think a lift pump is a band aid for your real problem. The pump is keeping extra fuel pressure and not letting your truck fail as it was before.
05-05-2014 10:56 AM
knaffie
Quote:
Originally Posted by Rttoys View Post
Did you go with one lift pump or two? I know Kennedy sells them both.
Single. Easy to add on another to it to make it dual if I want to. But I never will. One more year and it's new truck time for this guy.
05-05-2014 10:47 AM
Rttoys
Quote:
Originally Posted by knaffie View Post
I'm not celebrating yet, but it looks as if the lift pump cured the problem. .
Did you go with one lift pump or two? I know Kennedy sells them both.
05-05-2014 09:51 AM
knaffie I'm not celebrating yet, but it looks as if the lift pump cured the problem. It definitely drives a lot livelier than it did before. Spools up faster and accelerates harder. I tried twice yesterday and once today to get it to screw up, and it hasn't yet. Hopefully it stays that way.

The lift pump install was pretty simple, just took a while, about 6 hours total. The only thing not included in the kit is chafe protection for the hoses. I had a little bit of large wire loom in the garage, but need to pick up some more. My only complaint (and not really one) would be that you can't verify if the pump is actually running. I'm going to have somebody push the over-ride button with the truck off and see if I can hear / feel it running. It's that quiet.
04-29-2014 12:03 PM
knaffie
Quote:
Originally Posted by 79chevy39.5's View Post
so what kind of testing did they do? return rate? does the truck have any smoke, or a miss when it drops rail pressure? could indicate a sticking injector

ive never seen this on a duramax however I have had similar things happen on 5.2 Isuzu's
I didn't ask what they did. I assume they opened up the filter head, saw that the check ball and spring were missing, put them back, test drove it and observed no problem, then said it's done.

No smoke, no miss.
04-29-2014 09:00 AM
79chevy39.5's so what kind of testing did they do? return rate? does the truck have any smoke, or a miss when it drops rail pressure? could indicate a sticking injector

ive never seen this on a duramax however I have had similar things happen on 5.2 Isuzu's
04-29-2014 08:51 AM
knaffie I don't want to knock Merchant. They are good shop and good people. They said they replicated the issue, put the ball and spring back in, then the issue never came back after multiple tests. Kinda hard to believe since every time I tried it since I got it back it has dropped FRP. But I am not calling them liars. It costs me a lot money and schedule juggling to leave it with them for a whole week. I need my truck now so I it's not going back to them.

Sent from AutoGuide.com App
04-29-2014 08:26 AM
D45 I am surprised, I have heard nothing but good things from Merchant Auto
04-29-2014 07:08 AM
knaffie
Quote:
Originally Posted by badassblaze View Post
Either way, I think a lift pump will fix it, or expose where you're sucking air into the system
Agreed.
04-29-2014 07:05 AM
badassblaze I'm almost wondering if it isn't sealing against the filter head. Either way, I think a lift pump will fix it, or expose where you're sucking air into the system
04-29-2014 06:28 AM
knaffie Well, I'm breaking down and have a Kennedy lift pump on the way to install this weekend. It is a lot more desirable to me than the other two big brands on the market for several reasons.

Hopefully this cures it for good. We'll see soon enough.
04-29-2014 03:37 AM
knaffie Is NOT fixed. I took their word that it was, but it's not. They said they tested it several times and it was fine, but that's hard to believe because I have never had a problem making it act up. Did it twice yesterday and once today. This morning it dropped all the way to 4K FRP and I got a P0087 before I was at 60 MPH. UGH!
04-26-2014 05:04 AM
knaffie
Quote:
Originally Posted by D45 View Post
Fuel filter adapter for what?
So you can run a better, cheaper filter.

Sent from AutoGuide.com App
04-26-2014 05:04 AM
knaffie
Quote:
Originally Posted by Rttoys View Post
I didn't go back and search: which adaptor was it?

A lift pump helps with everything.
Alligator

Sent from AutoGuide.com App
04-25-2014 08:21 PM
D45 Fuel filter adapter for what?
This thread has more than 25 replies. Click here to review the whole thread.

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