Fuel filter color
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Elder User
Joined: Mar 2003
Posts: 588
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From: AZ.
Fuel filter color
I took our 10,000 toyhauler out last weekend and had to keep the pedal to the floor to maintain 65-70 MPH on the level with my '97 PSD. It has 54,000 miles on it. I checked for water and changed the fuel filter. It was a dark brown or almost black in color. Is this a result of being in the diesel fuel ar was it caused by contaniments? . I haven't pulled with it since so I don't know if changing it helped. It was changed about 3000 miles ago. Could the Cat be clogged with the low mileage? It ran OK a couple weeks ago along the same route.
Thanks for any comments.
Thanks for any comments.
Laughing Gas
Joined: Apr 2002
Posts: 1,007
Likes: 1
From: Newport News
How in the heck does oil get in the fuel bowl? 
You shouldn't have any oil lines or anything flowing anywhere near the inside of that fuel bowl. The injector o-rings are on the tip of the injectors where they stick into the heads, and aren't anywhere near the fuel bowl, which is on top of the motor. The fuel filters get that nasty brown color on their own from normal use. Run one in any PSD for about 10000-15000+ miles and they'll look like that. All that is is contaminents from the fuel and could be a little algae. They make biocides that can be added to the fuel tank to control algae problems. Either way, the dark color doesn't hurt anything, it's just a sign that the fuel filter should be changed more often.
Terry
You shouldn't have any oil lines or anything flowing anywhere near the inside of that fuel bowl. The injector o-rings are on the tip of the injectors where they stick into the heads, and aren't anywhere near the fuel bowl, which is on top of the motor. The fuel filters get that nasty brown color on their own from normal use. Run one in any PSD for about 10000-15000+ miles and they'll look like that. All that is is contaminents from the fuel and could be a little algae. They make biocides that can be added to the fuel tank to control algae problems. Either way, the dark color doesn't hurt anything, it's just a sign that the fuel filter should be changed more often.
Terry
Post Fiend
Joined: Aug 2002
Posts: 5,324
Likes: 1
From: Denton,TX
They get black when the o-ring fail and oil makes it into the fuel system. At least on the 1997 and older trucks that is a classic symptom of o-ring failure. Maybe it's different with the fuel system in the newer trucks.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Originally Posted by basstardo
How in the heck does oil get in the fuel bowl?
You shouldn't have any oil lines or anything flowing anywhere near the inside of that fuel bowl. The injector o-rings are on the tip of the injectors where they stick into the heads, and aren't anywhere near the fuel bowl, which is on top of the motor. The fuel filters get that nasty brown color on their own from normal use. Run one in any PSD for about 10000-15000+ miles and they'll look like that. All that is is contaminents from the fuel and could be a little algae. They make biocides that can be added to the fuel tank to control algae problems. Either way, the dark color doesn't hurt anything, it's just a sign that the fuel filter should be changed more often.
Terry
You shouldn't have any oil lines or anything flowing anywhere near the inside of that fuel bowl. The injector o-rings are on the tip of the injectors where they stick into the heads, and aren't anywhere near the fuel bowl, which is on top of the motor. The fuel filters get that nasty brown color on their own from normal use. Run one in any PSD for about 10000-15000+ miles and they'll look like that. All that is is contaminents from the fuel and could be a little algae. They make biocides that can be added to the fuel tank to control algae problems. Either way, the dark color doesn't hurt anything, it's just a sign that the fuel filter should be changed more often.
Terry
Laughing Gas
Joined: Apr 2002
Posts: 1,007
Likes: 1
From: Newport News
How does it get back to the fuel filter though? I would imagine that once the fuel makes it to the injector it's shot into the combustion chamber? I guess my question is more what route does the fuel take from the tank to the final shot of gettin burned, and how does the oil make it to the filter?
Elder User
Joined: Feb 2004
Posts: 907
Likes: 0
From: West Haven, UT
Originally Posted by basstardo
How does it get back to the fuel filter though? I would imagine that once the fuel makes it to the injector it's shot into the combustion chamber? I guess my question is more what route does the fuel take from the tank to the final shot of gettin burned, and how does the oil make it to the filter?
Mike
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Elder User
Joined: Dec 2001
Posts: 527
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From: Central WA USA
The oil pressure at the injectors is higher than the fuel pressure coming to the injector, it the O ring fails, oil will be pushed back into the fuel system.
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Elder User
Joined: Mar 2003
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From: AZ.
OK, but the fuel looks clear, I guess it's not enough to distinguish color in it .. If that is the case, it doesn't seem enough to zap preformance as bad as it was. This thing is really lazy that's why I was thinking clogged filter.????
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