There were some of the steel tanks getting rust..so that I think was covered till they could get those corrected. But that was chassis trucks.

 

[QUOTE=Bounds-Electric;11371385]The secondary filter on both 6.4L and 6.7L engines is rated to 4 microns...can rust particles get through that?

 

Depends on the vehicle, but mine has a plastic tank, not steel.

 

The plastic tank was not were they found rust, it was the neck that holds the sender, and pick up tube. Ford replaced under warranty! ALL diesel has moisture and it go's to any metal!

 

There have been a few 6.4 HPFP system replacements posted on various forums and still the $8K - $10K IIRC. Ford has the same tech note with pictures of rust for the 6.4; probably out before they posted one for the 6.7.

I too would not think rust from tank should make it back to pump; but it would make it to the engine filter which is one of the places they look. Once that pump starts to go; it is probably too late.

ULSD has propensity to carry smaller emulsified water particles than LSD; add bio (which is good for lubricity) and the emulsified water possibility gets worse.

There are benefits of intentionally running emulsified water in diesel fuel; it is being done. Probably not an issue for an engine that is working all the time.

I think or suspect the issue could be worse for trucks that are not driven regularly and the emulsified water drops out (and metal rusts).

Back to topic.... I do not recall as many posts of failed hPFP at same point of life for the 6.4 relative to 6.7 (but maybe Ford was covering under warranty which keeps things quieter) and then with what they learned on the 6.4 came out punching on the 6.7

I suspect the Siemens pump might be a better pump; I wonder why Ford switched to Bosch? Many reported WIF w/ 6.4 and no early failures; so maybe the pump is tougher?

I don't think the filter technology has kept up with the fuel with respect to filtering the new ULSD and emulsified water. More reason that the pump ought to be able to handle a little moisture w/o failure.

For me, additive to improve lubricity, drain the WIF, drive it more frequently (at least once a week), and keep the fuel tank full.

Most disturbing is Ford not covering under warranty; if it is such a small issue then they should eat it. Since they are not, it must be a bigger issue. I have put my new truck purchase on hold.

Bob

 

Not that anyone would, but WIF is something that an owner could do to cause issues themselves if they were to try something frivolous. Add some water to the tank and get a new fuel system on Ford's dime. That may be part of the thought process behind not covering damage under warranty. Just a thought. We all know there are people out there that would do it.

 

When this post first came up, I went over to the 6.7 forum and printed the entire forum to read "hands on" ( I rather look at printed material than a screen, it allows me to track the comments easier) (I am that old). The HPFP issue from what I have read and the little research I have seen seems to be limited to a few vehicles at this time. (In the future, who knows) I own a 20 foot Triumph boat and one of the issues I deal with all the time is water in fuel and 10% ethanol mix also. One of the ways I deal with that is keep a full tank, add additives to help correct fuel/water seperation, only buy fuel from busy stations who sell allot of fuel, there by not buying stale fuel. Of course with our vehicles, draining and inspection fuel filters is a must (I am learning).
Dave

 

And that's all one can do.

HPFP's are not perfected. Zmax offers a guarantee that if you use their product they'll pay for repairs but the fine print excludes HPFPs. So it's not just Ford that recognizes it.

 

Sensitive HPFP's were touted pretty strongly for the 6.4 when i first started reading these forums. A lot of the other brand loyalists were pointing this out with a bunch of links. My best friend has a 09 F-350 which is the reason I bought my 10. He ran out of fuel driving up the Alaskan hwy, he then got water and who knows what else on his trip back. they drained his tank and fuel system and thats all. he also changes his fuel filters every 20K allthough he was doing it more frequently due to those incidences . So the two biggest threats to the fuel system have happen to him with out any failures. he may be lucky but two me that proves that the fuel system isn't quite as fragile as some may want you to think. I do change my filters every 10K mile to be on the safe side and empty my separator every month or after a long trip with a lot of fill ups with no water found so far.

 

A buddy of mine has an 08 Anniversary edition. Has ~65,000 miles, didn't know to drain the FWS (Light hasn't came on), Stretches oil changes and fuel filters way more than recomended, mostly city driving, doesn't use additive, runs the diesel to 10-15 MTE before filling, and rarely fills up. Only issues were a cracked DPF at 5,000 miles and a leaking rad at 60,000.

 

Not many people come on forums and tell us what issues they don't have! Wish they would because it would help me sleep better. An $8k fuel system or $20K motor is a nightmare I hope not to live through.

 

I agree but still the general consensus is don't slide on maintance, if two many people brag about limited maintance with no problems it would send the wrong message, I just believe the problems are driven by people that are not familiar with maintance on these newer diesels.

 

Agree 100%. Although the few 6.7 failures dont seem to have consensus on the cause. One of the folks i know of it happen to was a die hard Ford fan that gave out tons of advice on 6.0s and defended Ford to the hilt now him and another I know are turning others off Ford and recommend other manufactures. They believed with high expectations that the 6.7 was the saving grace to Fords diesel situation. I am by no means an expert on the 6.4 or any other truck but my personal experience from those I know that use the product are satisfied without major failures.

One last thing that made my decision for the 6.4. when I was in Iraq I was at a pretty big base. I asked the motor pool manager what was their best Diesel and truck. There were hundreds of diesels on this base. He told me the 6.4's were by far the best diesel they had and truck for the matter. The Chevys were cheap and dented easily and the motors didn't like the fuel and kept clogging up. They didn't have any newer ram diesels but the dodges they did have (rams and Dakotas) were crap and would shake them selves apart and the suspensions didn't last. I don't know if the 6.4s had DPF or not but suspect they didn't.