I don’t think this is rust-

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Jdc1

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Was having drivability issues on a customers truck. Ended up being inconsistent fuel pressure, trying to figure out what this is as it doesn’t look like rust. Thanks, @cruisermatt for getting that tank out so quickly.

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I wonder if that was some botched tank sealer?

Bottom shelf Harbor Freight style.
Tank was recalled in 1991(FJ60 ssshhhh - Toyota doesn’t really mean it when they say heritage program). Wondering if it’s that algae or bacteria the diesel guys get.
 
Was having drivability issues on a customers truck. Ended up being inconsistent fuel pressure, trying to figure out what this is as it doesn’t look like rust. Thanks, @cruisermatt for getting that tank out so quickly.

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Is this gasoline or diesel? I agree that it could be tank sealer, but it looks too thick to be algae.

I’ve had algae build up and clog my tank (and filters) in my Mercedes diesel. You can get bioklean to kill that. But it looked more natural and less uniform than that. What does the fuel filter look like?
 
Is this gasoline or diesel? I agree that it could be tank sealer, but it looks too thick to be algae.

I’ve had algae build up and clog my tank (and filters) in my Mercedes diesel. You can get bioklean to kill that. But it looked more natural and less uniform than that. What does the fuel filter look like?
Its gas- truck likely was in storage for awhile(years). Haven’t opened the filter yet but it’s definitely clogging things.
 
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