Co-worker with 6.4 Ford Power Stroke problems.

Capricious · Jan 23, 2015

".. Metal in the fuel filters..."

I don't much about these things, but I would assume the fuel filters are upstream from the injection system; does this thing have a low pressure fuel pump upstream from the filters? If not, then the shavings would have to originate somewhere other than the engine, correct ???

dodge man · Jan 23, 2015

Its my understanding there is a fuel filter before and after the high pressure fuel pump.

Capricious · Jan 23, 2015

Well, it doesn't really say how the filters are plumbed:

http://www.powerstrokediesel.com/docs/64L_Fuel_Filter_Change_Guide.pdf

But I would not think the secondary filter would be downstream of an high pressure pump.

I guess I wonder which filter is are the shavings showing up in, or are they in both ??

dodge man · Jan 23, 2015

I've never seen the truck so I have no idea, but I thought I read somewhere the second filter was after the high pressure pump. This would make sense otherwise why have two?
?

mikehaugen · Jan 23, 2015

I don't know, the injector pump creates thousands of psi (at least I think so) not sure how many filters could handle that.

dodge man · Jan 23, 2015

Yes, that's true, I think most common rails run in the 26,000 psi or more range. The only way a filter would handle that would be if its on the return line to the fuel tank.

terryknight · Jan 23, 2015

i believe there is a filter/water separater, low pressure pump (10-15psi), smaller micron fuel filter, high pressure pump

mikehaugen · Jan 24, 2015

dodge man said:
Yes, that's true, I think most common rails run in the 26,000 psi or more range. The only way a filter would handle that would be if its on the return line to the fuel tank.

Is there a return line after the injector pump?

Edit... I'm thinking about this wrong I guess, I'm still thinking old school diesels where there is a mechanical pump with line going to each cylinder. On the new diesels I guess there could be a return line, I don't know.

Cat_Driver · Jan 24, 2015

With so many horror stories including mine with diesels I wonder why any of us even buy them any more.

dodge man · Jan 24, 2015

I don't know a lot about the Ford diesels but most modern diesels are a common rail and very high pressures. Most of the fuel being pumped is sent back to the tank. I'm not sure, but the mechanical injection om my little Kubota diesel has a return line.