bleeding air out of the fuel filter - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 08-24-2011, 12:38 AM Thread Starter
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bleeding air out of the fuel filter

Ok guys dies anyone know where this bleed orfice is on our trucks and how to purge the air from our fuel systems.

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post #2 of 14 Old 08-24-2011, 05:37 AM
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It purges itself Very Quickly. The pump constantly supplies fuel to the filter housing and, whatever the engine doesn't use, goes back to the tank.

In fact, you probably run the entire tanks worth of fuel through the filter 10X by the time you burn it!

Turn the key on so the pump runs until it times-out (safety reasons, you never want an electric pump running constantly while the engines off because, in an accident, it would contribute to a fire) and shut the key off for a few seconds and back on so it will run again.

Three times and you'd have Everything 100% purged
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post #3 of 14 Old 08-24-2011, 11:17 AM Thread Starter
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How does it purge though I don't think anyone really knows

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post #4 of 14 Old 08-24-2011, 11:29 AM
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eeeyer just basicly sending the air back with the fuel return
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post #5 of 14 Old 08-24-2011, 11:40 AM Thread Starter
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That's what I'm wondering cause on big truck the air needs to leave

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post #6 of 14 Old 08-24-2011, 03:05 PM
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The air bleed is just in the threads in the filter housing below the seal, and is part of the fuel return circuit built into the filter bowl and air is returned to the tank.

This is a 6.0 bowl, the 7.3 is the same but a larger bowl


When you say "big truck" are you referring to a large engine with a mechanical system that must be bled or primed after a filter change or repairs?

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post #7 of 14 Old 08-24-2011, 03:39 PM Thread Starter
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yeah im in class for like semis ok know where does that air bleed black into the tank so the air is always trapped in the fuel system sounds f up or is it just me i cant figure this one out . i see what you are saying bout that bleed whole but where does it go from there does it have a line on the inside from the canister to the tank im loast dont wanna screw up my fuel system.

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post #8 of 14 Old 08-24-2011, 03:56 PM
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Originally Posted by usnavyad View Post
yeah im in class for like semis ok know where does that air bleed black into the tank so the air is always trapped in the fuel system sounds f up or is it just me i cant figure this one out . i see what you are saying bout that bleed whole but where does it go from there does it have a line on the inside from the canister to the tank im loast dont wanna screw up my fuel system.
The top fitting, on the left, goes back to the tank and is the return line.


Because it IS at the top, any air is quickly carried away. As I said, it purges air VERY QUICKLY as soon as the fuel bowl is filled.....
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post #9 of 14 Old 08-24-2011, 03:59 PM Thread Starter
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hmmm so no air can get into the lines huh

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post #10 of 14 Old 08-24-2011, 04:04 PM
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You talking like on the old IDI's where you had to crack the injector line and crank it till fuel started spitting out? That's what our fuel bowl is for, instead of just having a inline filter.
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