One to think about
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Postmaster
Joined: Feb 2006
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From: waynesville, mo.
One to think about
Got an 08 6.4 that after driving, park it on an incline with driver side down, it wont start. Fuel gets aerated. Bleed the high pressure side, it'll start and run, until parked driver side down (wont do it pass side down). Tank unit replaced, low pressure pump replaced. All lines and washers ok and tight. (SO YOU WANT TO BE A TECH?)
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From: Isanti, MN
Very interesting problem.
I figure the problem can't be on the high pressure side because there is a huge amount of pressure in those lines; a hole there would squirt fuel outward rather than ingest air into the lines.
The low pressure side operates at a much, much lower 3 PSI of pressure, so it's much more likely the issue is on this side.
And if I remember right the secondary fuel filter is on the driver's side of the engine. Now I'm not too sure how the fuel flows inside the filter housing, but I'd guess either an improperly installed filter or gasket. If not that I'd guess something awry with the filter housing...
Am I even close?
I figure the problem can't be on the high pressure side because there is a huge amount of pressure in those lines; a hole there would squirt fuel outward rather than ingest air into the lines.
The low pressure side operates at a much, much lower 3 PSI of pressure, so it's much more likely the issue is on this side.
And if I remember right the secondary fuel filter is on the driver's side of the engine. Now I'm not too sure how the fuel flows inside the filter housing, but I'd guess either an improperly installed filter or gasket. If not that I'd guess something awry with the filter housing...
Am I even close?
Thread Starter
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Postmaster
Joined: Feb 2006
Posts: 3,201
Likes: 4
From: waynesville, mo.
Very interesting problem.
I figure the problem can't be on the high pressure side because there is a huge amount of pressure in those lines; a hole there would squirt fuel outward rather than ingest air into the lines.
The low pressure side operates at a much, much lower 3 PSI of pressure, so it's much more likely the issue is on this side.
And if I remember right the secondary fuel filter is on the driver's side of the engine. Now I'm not too sure how the fuel flows inside the filter housing, but I'd guess either an improperly installed filter or gasket. If not that I'd guess something awry with the filter housing...
Am I even close?
I figure the problem can't be on the high pressure side because there is a huge amount of pressure in those lines; a hole there would squirt fuel outward rather than ingest air into the lines.
The low pressure side operates at a much, much lower 3 PSI of pressure, so it's much more likely the issue is on this side.
And if I remember right the secondary fuel filter is on the driver's side of the engine. Now I'm not too sure how the fuel flows inside the filter housing, but I'd guess either an improperly installed filter or gasket. If not that I'd guess something awry with the filter housing...
Am I even close?
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Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
I see...
I knew the FRP was on the high side, but I figured that because air compresses far more than fuel that the pump could ingest air and thus not be able to build enough pressure on the high side.
So it was the fuel cooler? I thought the fuel cooler only cooled return fuel coming from the HPFP as it went back to the HFCM and tank... Aerated fuel returning to the HFCM would be recycled back to the HPFP I think.
But you implied that the problem had nothing to do with the low pressure side, so now I'm confused.....
I knew the FRP was on the high side, but I figured that because air compresses far more than fuel that the pump could ingest air and thus not be able to build enough pressure on the high side.
So it was the fuel cooler? I thought the fuel cooler only cooled return fuel coming from the HPFP as it went back to the HFCM and tank... Aerated fuel returning to the HFCM would be recycled back to the HPFP I think.
But you implied that the problem had nothing to do with the low pressure side, so now I'm confused.....
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From: Cartersville, Ga
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Postmaster
Joined: Feb 2006
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From: waynesville, mo.
I see...
I knew the FRP was on the high side, but I figured that because air compresses far more than fuel that the pump could ingest air and thus not be able to build enough pressure on the high side.
So it was the fuel cooler? I thought the fuel cooler only cooled return fuel coming from the HPFP as it went back to the HFCM and tank... Aerated fuel returning to the HFCM would be recycled back to the HPFP I think.
But you implied that the problem had nothing to do with the low pressure side, so now I'm confused.....
I knew the FRP was on the high side, but I figured that because air compresses far more than fuel that the pump could ingest air and thus not be able to build enough pressure on the high side.
So it was the fuel cooler? I thought the fuel cooler only cooled return fuel coming from the HPFP as it went back to the HFCM and tank... Aerated fuel returning to the HFCM would be recycled back to the HPFP I think.
But you implied that the problem had nothing to do with the low pressure side, so now I'm confused.....
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Postmaster
Joined: Feb 2006
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From: waynesville, mo.
Warranty........cant just replace parts. Gotta have proof and prior approval.
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Postmaster
Joined: Feb 2006
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From: waynesville, mo.
Yep! Runs and drives fine, no misfires, plenty of power.
Post Fiend
Joined: Jan 2009
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From: Greenwood, SC
How can air get in, but fuel does not leak out? There must be a backflow/pressure relief or something like that somewhere, right?
Maybe a fuel injector, when there is no ignition power, is allowing compression to go back into the fuel system? Just happens to be on the driver side of the motor?
Maybe a fuel injector, when there is no ignition power, is allowing compression to go back into the fuel system? Just happens to be on the driver side of the motor?