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post #1 of 9 (permalink) Old 10-21-2018, 12:31 AM Thread Starter
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Oil in Fuel

Should I be concerned? I just changed my fuel filters after 15,000 miles and cut them open to have a look. The darkest is closest to the engine. Poured them both out in clear containers and didn’t see anything resembling oil, but one of the two filters definitely looks blackish in color compared to the other. Perhaps the dark one is the main filter for the big stuff so it’s datker?

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #2 of 9 (permalink) Old 10-21-2018, 12:55 AM
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Re: Oil in Fuel

Have you lost any large amount of oil? It doesnt look like there is oil in the fuel.

Shoulda bought a Cummins.

1997 F250 7.3L XLT, 4x4, 5spd, 315K, TS chip, BD Turbo-Thruster II, Donaldson 6637 filter, 4" straight piped dual exit SOLD

1995 F350 CCLB 6.0L WIP


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post #3 of 9 (permalink) Old 10-21-2018, 01:37 AM Thread Starter
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No I haven’t lost any oil to speak of but I’m getting a strong odor of burning oil from my exhaust. The engine is running perfect actually, but the burning oil smell is new. The day I switched to Motorcraft oil, the smell started.

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #4 of 9 (permalink) Old 10-21-2018, 01:39 AM Thread Starter
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There was no oil residue in the filter housing but the paper pleats of the filter closest to the engine is much datker than the 1st filter. I’m not even sure how that’s possible. I would think the filter closest to the tank would be the darkest and most dirty, but it actually looks almost new.

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #5 of 9 (permalink) Old 10-21-2018, 02:15 AM Thread Starter
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I’ve been looking at pics online and it actually may be normal to look like that.

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #6 of 9 (permalink) Old 10-21-2018, 02:41 AM
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Re: Oil in Fuel

Yea if there was oil in the fuel, the fuel would be black. Is the motorcraft stuff lighter weight? When I switched from 15w rotella to 5w motorcraft I got a bit more burning and fumes too.

Shoulda bought a Cummins.

1997 F250 7.3L XLT, 4x4, 5spd, 315K, TS chip, BD Turbo-Thruster II, Donaldson 6637 filter, 4" straight piped dual exit SOLD

1995 F350 CCLB 6.0L WIP


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post #7 of 9 (permalink) Old 10-21-2018, 04:02 AM
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Re: Oil in Fuel

If the filter closet to the motor is of a finer micron rating, it will be filtering out the finer material (which would pass through the larger pored filter (if that is the case on your setup). Cheers!

97 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, Ext Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed

SOLD: 94 F350 CC DRW PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, 3” DP, Bilsteins, $12 AIC, Coolant Filter, Explorer O/H Console, Trans Temp, Boost, and Pyro, Pedestal Mod, Gutted EBPV
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post #8 of 9 (permalink) Old 10-21-2018, 04:05 PM Thread Starter
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That makes sense to me. Well I guess I can rule out injector O-Rings as a possible cause of the burning oil smell.

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #9 of 9 (permalink) Old 10-21-2018, 08:35 PM
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Re: Oil in Fuel

ya I don't think you have injector oring problems.

96 F350 rclb drw 2wd psd (built not bought)
01 Excursion Limited 4wd psd (the wifes ride)
02 F350 cclb drw 4wd psd (the land yacht)

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