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Rust in fuel

Old 12-30-2018, 12:49 PM
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Rust in fuel

I started having problems with my injection pump and considering the age and miles I didn't think much of it. Dropped it off at the rebuilder and shortly after he called me and said that the pump was damaged by rust. I replaced the feed and return lines from the tank with stainless, the old ones were rusty. Checked the high pressure lines and ran a brush through them and found no signs of rust. Dropped the tank and wiped it out and was actually surprised how clean the tank was for such an old truck. However a couple thousand miles later I took a fuel sample and found rust in it. Any idea where rust could be hiding? How about the fuel heater or maybe inside the fuel filter mount?
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Old 12-30-2018, 03:58 PM
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Diesel fuel is also a lubricant and shouldn't cause rust in the fuel system. Unless you have water trapped somewhere and that is allowing the area to rust and get into the fuel system. Only thing that jumps into my head is the filler neck from tank to truck box.
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Old 12-30-2018, 04:16 PM
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Where do you buy your fuel? Any chance you're getting poor supply quality?

Next time, bring a new Jerry can and fill it up. Get it home and inspect.

Filler neck is a good idea !
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Old 12-30-2018, 04:26 PM
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Had not thought of the fuel station....very likely that could be your culprit if they are an old location with steel tanks in the ground and a low volume station and don't change their filters regularly.
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Old 12-30-2018, 04:38 PM
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Are you by any chance using FRAM fuel filters? I just saw a YouTube video where a mechanic cut open 5 different brands of oil filters and he found that FRAM filters were crappy cardboard inside and had RUST in them already.
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Old 12-30-2018, 04:47 PM
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Originally Posted by edwinsmith View Post
Are you by any chance using FRAM fuel filters? I just saw a YouTube video where a mechanic cut open 5 different brands of oil filters and he found that FRAM filters were crappy cardboard inside and had RUST in them already.
really?

that's crazy
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Old 12-30-2018, 04:51 PM
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Originally Posted by edwinsmith View Post
Are you by any chance using FRAM fuel filters? I just saw a YouTube video where a mechanic cut open 5 different brands of oil filters and he found that FRAM filters were crappy cardboard inside and had RUST in them already.
Here's the video.


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Old 12-30-2018, 05:47 PM
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Yeah I do NOT buy Fram filters...they are junk.
I use Fleetguard Stratopore oil filters only for my rigs.

The station selling you rusty fuel is a solid guess.
Otherwise rusty filler necks are very common.
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Old 12-30-2018, 05:50 PM
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oil filter is different from fuel filter!!!
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Old 12-30-2018, 05:54 PM
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Originally Posted by oliver foster View Post
Yeah I do NOT buy Fram filters...they are junk.
I use Fleetguard Stratopore oil filters only for my rigs.

The station selling you rusty fuel is a solid guess.
Otherwise rusty filler necks are very common.
​​​​
I agree. The fuel filter should stop any rust from entering the high pressure pump. Unless the filter is junk.
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Old 12-30-2018, 06:43 PM
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Originally Posted by johnh View Post
oil filter is different from fuel filter!!!
Yes but on a separate note, Fram filters are junk.
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Old 12-30-2018, 07:45 PM
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Originally Posted by oliver foster View Post
Yes but on a separate note, Fram filters are junk.
My reason for mentioning FRAM oil filters is that if they made fuel filters one could expect they would be of low quality also. I've never had a FRAM fuel filter on my truck so I don't KNOW how they are made. I use WIX fuel filters and Purolator Oil filters because I bought a case of them about 14 years ago.

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Old 12-30-2018, 08:16 PM
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Originally Posted by oliver foster View Post
yes but on a separate note, fram filters are junk.

fact!


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Old 12-30-2018, 09:22 PM
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Thanks for all the thoughts. I forgot to mention that the filler neck was rusty but has been cleaned up. The station I get my fuel from is a busy place and don't think that the fuel sits around long but I will take a sample and inspect it. I wont be getting fuel for a couple of weeks but will post the inspection results when I do.
I never thought about importing the rust from the filter. I usually find filters on ebay and now am wondering if maybe that could be a problem. The last couple of filters I used were napa. Has anybody ever found an adapter to run a CAT fuel filter on our early 1st gens. I see the adapters for the newer trucks. I understand that the CAT 750 fuel filter is excellent quality and only a 2 micron, much finer than our factory filter.
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Old 12-30-2018, 09:35 PM
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I use this:
Fleetguard FS1221 Fleetguard FS1221

I've read it's 22 micron @ 98% efficiency, whatever that implies
I buy them from a local truck supplier for less $$
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