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Old 04-26-2013, 07:50 PM
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Join Date: Aug 2005
Location: Oregon
Posts: 314
There are basically two alternate methods for curing a crudded up tank.

The slow method, by using biocides and tank cleaner type chemicals, entails frequent and numerous filter changes. If your tank interior is really bad, this can take a year, in which case it ends up being pretty expensive. Burning B99 for a while can speed the process up.

The quicker method is to have the tank cleaned, and flush the fuel lines. It's also a good time to replace all of the rubber fuel hoses if that hasn't been done recently. After that, an occasional maintenance dose of chemicals, or continuous use of bio-diesel, should keep things clean as long as you are careful about where you buy fuel.

I've never had to have a tank cleaned by the second method, but I probably would if the situation were bad enough that I couldn't keep ahead of the problem with filter changes.
'72 250C
'79 240D
'83 240D
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Old 04-26-2013, 09:15 PM
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Waiting for his Model 3..
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
Ya, sounds like plugged filters to me too. Good news is that's not hard to fix How's the clear pre-filter look?

1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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Old 04-27-2013, 12:25 AM
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Join Date: Sep 2006
Location: Middle TN
Posts: 3,530
The only time I actually had problems with crud in the tank, I dumped some Startron in and let it sit for a day or so. I never did clean the tank.

Startron was the 1st response to my query. I was skeptical but car is still running. Just approximate the amount on the label.

West Marine carries it. The McParts stores have the gas version. There may not be any real difference between gas & diesel versions but go look on Startron's web site to be sure.
85SD 240K & stopped counting. 84SD 180,000. Thinking of painting both.
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