Random Thought Thread

Nathan the Machinist said:
I don't understand how a dirty fuel filter leads to dirty fuel

I can see how a dirty fuel filter would lead to reduced fuel flow and eventually a stoppage

But I don't understand how a filter with a certain micron rating is going to lead to unfiltered fuel getting past that filter unless it is bypassing.

Serious question
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It’s not a dirty fuel problem. It’s not enough fuel getting to the pump, which causes it to overheat. That’s part of the recall on the 2020-2022 trucks, they are changing the programming on how it uses fuel to cool the pump at the same time. It supposedly started from just bio diesel because it goes bad quicker and can grow algae. It’s also a lubricity problem because the bearing can wear and it is causing the pumps to disintegrate. Ford supposedly fixed it with the CP4.2 that is actually in the trucks now by putting a pin in the bearing assembly so if it does fail it doesn’t explode and send metal and bearing pieces throughout the common rail.

At the end of the day it’s honestly luck of the draw like anything else. Your truck might have a good pump, or it might explode. 🤣
 
I’m definitely not a diesel mechanic but it is my belief that with the older CP4s they explode because they get starved, which causes them to over heat, and with ULSD you have less lubricity, it’s a recipe for disaster. You really don’t hear much about CP4s exploding on the newer trucks as often as they would on the older trucks.
 
Cap’n Smudge said:
I randomly saw an original CPK light chopper for sale on the exchange a minute ago.
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Looks like it might need to be sent back to the mothership for a re-grind? 🤔 Not a very good photo showing knife condition...

2v2ZakCzrxAhvqS.jpg
 
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