I'll be filling my tank up full soon for the first time since Ive owned the car. Was not able to fill it up before the winter came and the car went into intensive car. Ive have been driving the car a little bit all winter, maybe 100 miles max. Has had 5-7 gallons of ULSD in it for 6 months.

I am worried about condensation in the tank. Should I be? Is there an additive I can add that will help minimize the risk of too much water being in there?

My plan is to go to a truck stop and top it off on the first nice day here. I have two cans of Diesel High Test waiting in the wings. Would something else be better?

Or should I just fill it up and not worry about it?

Thanks,
dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

There is always going to be some water vapor and condensation.

Power Service removes water, slowly but surely.

Ken300D

CarFax Request - Lower prices please.

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

Also keeping the tank as full as possible will cut down on the amount of condensation that forms.

The are 2 schools of thought on this hot topic. One is to disperse the water into the fuel so i can be sent into the combustion chamber and eliminated.

The other is to coalese or cause the water to seperate and drop out of the fuel.

If you choose to diperse, you need to choose an additive that is ment to disperse the water. Power service has a couple of products that will do it. Their are many other companies that make dispersant additives also.

If you choose to coalese, I would strongly suggest you add an after market fuel filter with a water separator and clear drainable bowl.

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1999 E300DT (131,800) 154,000 Black on Black SOLD

2006 CLK 500 coupe Capri Blue on Grey (zoom,zoom)
47,000mi

04 VW TDI Passat 80,000mi
(Techno)

How to eliminate oil dependency through market-driven approaches.
“We could cut oil use in half by 2025, and by 2040, oil use could be zero,”
The Sound of Diesel Speed
Ode to MB

Run a tank or two, then replace the large fuel filter. The filter is supposed to trap water from what I understand, and you might get some junk out of the tank in the first tankful of running/shaking/sloshing anyway.

After that a full tank whenever sitting is best, especially in humid areas.

Most fuel treatments disperse the water through the fuel so that it can pass without harm through the system and dissapear through the exhaust. Too much dispersed water can IMO cause rust problems in the injection pump and nozzles if left to sit, best to get it through/out without extended periods parked.

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Gone to the dark side

- Jeff

Thanks for the replies. I think I will go with the 'disperse' route using Power Service stuff. Winter is excessively dry here so I am hoping this is not going to be a major issue, just wanted to check.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car