Fuel Filter

T/P got to say I totally disagree with your thinking. If your filter starts to plug it will make the lift pump work harder and cause it to fail sooner. How much sooner who knows, it will also starve the injector pump. Not a good thing and not a cheep repair!

I agree with N-Trouble, not changing out a filter to save a few bucks is like not adding a lube additive to a per 2007 diesel. Will it hurt your truck :@ most likely yes! But with the cost of these systems both gas and diesel why would someone risk it?

You mentioned Ford :R pulling lift pumps to check for rust, that is a last ditch effort to screw over their customer! If your tank had enough water in it to cause the lift pump to rust then the WIF (water in fuel) light should better have came on! All the posts about CP-4 pumps failing never had a WIF warning that I ever found! BTW the WIF warning is logged into the ECM and would be able to be found.

Don

Much depends on the quality of fuel. If you always get fuel at the same station and they keep their tanks clean and change the pump filters on a regular basis your are probably pretty safe going until the DIC says to change. On the other hand if you're doing lots of travel and forced to fuel up at numerous stations of questionable maintenance I would question the wisdom of pushing the limit.

My 2012 D/A has 27k on it, filter shows 35%.

As the filter clogs... isn't it causing increased flow and increased pressure on the unclogged portions of filter element... leading to a potential filter element tear and failure?

Turtle n Peeps wrote:

N-Trouble wrote:

Turtle n Peeps wrote:

N-Trouble wrote:
Most in the know don't go by the DIC. Change it every 10K. Yes its likely overkill but having your fuel system take a dump is upwards of $12K in repairs. WHy chance it over a few bucks. Cheap insurance IMO...

You guys waiting 25K miles are taking a big risk but to each his own.

Pickup up a fuel filter access door (ebay or diesel vendor) to make changing the filter a breeze.

:h You do realize that a dirtier filter filters out more contaminates than a clean one don't you?

Look at it this way; as it comes from that factory a new filter has lots of holes in it. Over it's lifetime some of those holes get pugged all the way, and some don't get plugged at all and most get plugged in between the two extremes. When they do get somewhat plugged up it will filter better because the holes are smaller.

As far as why the longer change time maybe the new engine reads differential pressures between the inlet an outlet of the fuel filter? I know on my LBZ the filter minder goes off exactly a 15K so I don't "think" there is a differential pressure sensor on the filter of my truck an it's just mileage based.

Where as the OMS drifts around 10K as it does have a algorithm in the system.

No, filtration is based on the micron spec for the filter media not how much******is in it. More******only means reduced flow, not extra filtration.

By running a clogged fuel filter you are running the risk of starving the CP4 fuel pump making it have to work that much harder to draw fuel from the tank. If your CP4 takes a dump it usually takes your entire fuel system down with it including injectors.

That is true; but that still does not mean the filter does not get more efficient as it cogs up. Think about it. The more holes are partially covered the smaller particles it will filter out. It's really that simple.

This works for all filters. That is why companies like K&N say not to clean their air filters too much. Honda, Harley and many others recommend it for their oil filters.

As far as starvation taking the CP4 out. I have not heard of one time of that happening. All the talk is about water contamination; all of it. Look at the Ford boards and they all check for rust in the pump. Not one word about clogged filters killing the pump from any of my tech friends.

Besides; the first gen CP4 is a junk pump anyway. Plenty of people with the recommended filter changes and the pump takes a dump anyway. We even have one or two on this board.

OK, I am going to agree with your theory that as the filter fills with debris it will filter better. Then I ask why ever change at all??

This leads to my point that as the filter becomes clogged flow is reduced which is not a good thing. If better filtration is what you are after there are BETTER ways of accomplishing than running an old dirty filter and reducing flow. Remember a brand new filter still meets minimum filtering requirements...

Unlike the Ford 6.7s which use a factory lift pump to push fuel from the tank to the CP4.2, GM trucks rely solely on the CP4.2 to not only supply the required 29K PSI to the injectors but also pull fuel from the tank. Everyone who has been following CP4 failures know they are a fragile overworked system so why would you want to make it work any harder than it already is?

Nobody really knows why CP4.2 failures occur as there are likely many reasons. In typical Ford fashion they have been playing the water in fuel card as a way to denying warranty claims. Water in fuel is not as prevalent as Ford is trying to make everyone believe.

I use Baldwin fuel filters in my 2005 dodge diesel. change them at 7,500 mile interval

you can push the coolant and oil change schedule, but one fill up with dirty fuel and you will be stopped on the side of the road!!!!

always keep one or two fuel filters in your tool box

GM says change the filter when DIC says or after 2 years whichever comes first.

N-Trouble wrote:

Turtle n Peeps wrote:

N-Trouble wrote:
Most in the know don't go by the DIC. Change it every 10K. Yes its likely overkill but having your fuel system take a dump is upwards of $12K in repairs. WHy chance it over a few bucks. Cheap insurance IMO...

You guys waiting 25K miles are taking a big risk but to each his own.

Pickup up a fuel filter access door (ebay or diesel vendor) to make changing the filter a breeze.

:h You do realize that a dirtier filter filters out more contaminates than a clean one don't you?

Look at it this way; as it comes from that factory a new filter has lots of holes in it. Over it's lifetime some of those holes get pugged all the way, and some don't get plugged at all and most get plugged in between the two extremes. When they do get somewhat plugged up it will filter better because the holes are smaller.

As far as why the longer change time maybe the new engine reads differential pressures between the inlet an outlet of the fuel filter? I know on my LBZ the filter minder goes off exactly a 15K so I don't "think" there is a differential pressure sensor on the filter of my truck an it's just mileage based.

Where as the OMS drifts around 10K as it does have a algorithm in the system.

No, filtration is based on the micron spec for the filter media not how much******is in it. More******only means reduced flow, not extra filtration.

By running a clogged fuel filter you are running the risk of starving the CP4 fuel pump making it have to work that much harder to draw fuel from the tank. If your CP4 takes a dump it usually takes your entire fuel system down with it including injectors.

That is true; but that still does not mean the filter does not get more efficient as it cogs up. Think about it. The more holes are partially covered the smaller particles it will filter out. It's really that simple.

This works for all filters. That is why companies like K&N say not to clean their air filters too much. Honda, Harley and many others recommend it for their oil filters.

As far as starvation taking the CP4 out. I have not heard of one time of that happening. All the talk is about water contamination; all of it. Look at the Ford boards and they all check for rust in the pump. Not one word about clogged filters killing the pump from any of my tech friends.

Besides; the first gen CP4 is a junk pump anyway. Plenty of people with the recommended filter changes and the pump takes a dump anyway. We even have one or two on this board.

N-Trouble wrote:

Turtle n Peeps wrote:

N-Trouble wrote:
Most in the know don't go by the DIC. Change it every 10K. Yes its likely overkill but having your fuel system take a dump is upwards of $12K in repairs. WHy chance it over a few bucks. Cheap insurance IMO...

You guys waiting 25K miles are taking a big risk but to each his own.

Pickup up a fuel filter access door (ebay or diesel vendor) to make changing the filter a breeze.

:h You do realize that a dirtier filter filters out more contaminates than a clean one don't you?

Look at it this way; as it comes from that factory a new filter has lots of holes in it. Over it's lifetime some of those holes get pugged all the way, and some don't get plugged at all and most get plugged in between the two extremes. When they do get somewhat plugged up it will filter better because the holes are smaller.

As far as why the longer change time maybe the new engine reads differential pressures between the inlet an outlet of the fuel filter? I know on my LBZ the filter minder goes off exactly a 15K so I don't "think" there is a differential pressure sensor on the filter of my truck an it's just mileage based.

Where as the OMS drifts around 10K as it does have a algorithm in the system.

No, filtration is based on the micron spec for the filter media not how much******is in it. More******only means reduced flow, not extra filtration.

By running a clogged fuel filter you are running the risk of starving the CP4 fuel pump making it have to work that much harder to draw fuel from the tank. If your CP4 takes a dump it usually takes your entire fuel system down with it including injectors.

you need to educate yourself on GM's new fuel filters.

Turtle n Peeps wrote:

N-Trouble wrote:
Most in the know don't go by the DIC. Change it every 10K. Yes its likely overkill but having your fuel system take a dump is upwards of $12K in repairs. WHy chance it over a few bucks. Cheap insurance IMO...

You guys waiting 25K miles are taking a big risk but to each his own.

Pickup up a fuel filter access door (ebay or diesel vendor) to make changing the filter a breeze.

:h You do realize that a dirtier filter filters out more contaminates than a clean one don't you?

Look at it this way; as it comes from that factory a new filter has lots of holes in it. Over it's lifetime some of those holes get pugged all the way, and some don't get plugged at all and most get plugged in between the two extremes. When they do get somewhat plugged up it will filter better because the holes are smaller.

As far as why the longer change time maybe the new engine reads differential pressures between the inlet an outlet of the fuel filter? I know on my LBZ the filter minder goes off exactly a 15K so I don't "think" there is a differential pressure sensor on the filter of my truck an it's just mileage based.

Where as the OMS drifts around 10K as it does have a algorithm in the system.

No, filtration is based on the micron spec for the filter media not how much******is in it. More******only means reduced flow, not extra filtration.

By running a clogged fuel filter you are running the risk of starving the CP4 fuel pump making it have to work that much harder to draw fuel from the tank. If your CP4 takes a dump it usually takes your entire fuel system down with it including injectors.