What about the Fuel Tank Screen. When you get Water in your Fuel you often get Rust with it.
Under hood try swapping the Fuel Inlet Hose with the Fuel Outlet Hose.

This will draw Fuel from above the level of the bottom of the Fuel Tank. You will also run out of Fuel sooner so keep at least 1/2 Tank of Fuel and do it just for test purposes.

The retun Fuel back flushing through the Fuel Inlet Hoses and Tubing might also be helpful.

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84 300D, 82 Volvo 244Gl Diesel

In my 90 Suburban (6.2 Detroit), I've got a Freightliner with a heater and water seperator in the bowl on bottom. The PO told me about "Diesel 911", form the same people who make Diesel Kleen. Since I use diesel AND WVO in it, I've gotten some water in it before. I remove the filter, pour Diesel 911 through it , fill it (the filter) up with the stuff and pour some into the fuel line , put it back on and fire it up. Works great! (Also pour about a half bottle in the tank to remove the water in there). Works for me!

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"Knowing is not enough, we must apply.
Willing is not enough, we must do." Goethe

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1951 Chevy 3100

2003 Indian Chief Roadmaster

1983 GMC 1 ton Dually

1982 Chevy 1 ton Dually, service body (sold)

'90 GMC Suburban 6.2 "SS Veg-Burban"
(single tank WVO\diesel conversion) SOLD

'81 300D ~ Mama's car...my job (now my car)(but still my job) SOLD

'83 300sd ~ rescue car SOLD

2005 Ford Taurus (Mama's new car)(NOT my job!)