Don't know about 1%, seems a lot. We have a Coalescer at work, about the size of a Volkswagon bug. It still has 200-500ppm in it. But your talking very small amounts.

 

 

Bless Your Heart as my PaPaw used to say. I am done on this subject.... Maybe someone else can help this poor man understand that there is a difference in the two terms and what the chemical limitations are for suspended water. My point was and is when the fuel comes from the tank farm and goes into the ground at a service station that is good as it gets quality wise... Can go downhill from there being polluted with water from whatever.

 

 

 

I apologize for the stupid question but isn't the fuel system (fuel tank) sealed when the cap is on? How does moisture condense inside a sealed fuel tank?

 

no, fuel tanks are not sealed, they still have vents in then. If they were completly sealed, youd evengually starve the engine of fuel, or if the pump is strong enough collapse the tank due to a vacuum. Try sucking water out of a plastic bottle with out letting any air in.

 

Fuel moisture and quality are largely out of (most of) our control - we’re not commercial buyers, so all we can do is buy from a station that sells a lot of diesel and is reputable. Having been through a replacing the high pressure pump and EVERYTHING downstream of it on my Transit diesel, it’s a PIA - 5 weeks at the dealer and a half page worth of parts. I have read the complaints about the CP4 pump, which uses the diesel fuel for lubrication, same as in my Transit. What can you do? A few common sense things. First, use a diesel additive. I use Lucas in my Transit, but you can buy the Ford one on Amazon for less than $10/bottle in 12pks if you’re worried about warranty issues. I did not notice any miracle changes in my engine after starting to use the additive, though it does seem a little smoother at high RPM’s, but I’m not putting any money on it. No change in mileage. The repair done on my Transit was a warranty/recall; I do not want to have to pay to have it done again - I think it was 30hrs of shop labor! Second, don’t run the tank dry - especially when it’s cold. If there’s water not in solution, let it stay at the bottom. I refill my tank at 1/4. Lastly, don’t store your truck with low fuel - fill it full, especially if you park it outside or somewhere with large temperature swings. I figure if I do those 3 things, I’m way ahead of the pack and odds are on my side. Everything else is out of my control, so I don’t sweat it.

 

If I'm not mistaken, the OP posted CP-4 failure, yet the truck is still sitting waiting for diagnosis. Low fuel pressure can be caused by a number of issues.I thought I read that he said it may be a lift pump. Which does not make this a CP-4 failure. My truck had a check engine light and the dash warning of low fuel pressure, turned out to be the fuel pressure sender went bad. Let's not jump the gun here. I enjoy forums and a lot can be learned on them, but also a lot of red flags can be raised before the fact.

 

Any changes to the 2020 CP4 pump?

 

Great question , even pawpaw wants to know that answer.

 

Not sure of what they changed, but it will be running at higher pressures.

 

Thanks, I was hoping some changes for more durability.