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Old 01-24-2020, 01:46 AM   #57
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Originally Posted by grindstone01 View Post
The trapped air inside the fuel tank may hold 1/2 a drop of water in it at most. The outside of the steel tank will have dripping water on it's side because it is exposed to unlimited air volumes that will release it's water. Now if the fuel cap is left off, then water laden air will have a chance to enter and release it's water. Most new fuel tanks are plastic which acts as an insulator from the temperature difference.
My 2016 Freightliner Chassis motorhome still has a 90 gallon steel tank. Many are still vented to atmosphere including my "16".
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Old 01-24-2020, 05:46 AM   #58
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My Mechanic rec. Seafoam in the diesel tank. Has anybody had experience with that product? Thanks
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Old 01-24-2020, 06:05 AM   #59
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Diesel fuel

As a new diesel fuel motorhome owner, you guys are scaring the crap out of me.
When I bought my motorhome, they didn't even tell me about DEF, I read it on this forum, thank you very much, Now I hear about bio additives for winter storage. My camper has been parked since end of October, I have a small sprinter RV. What should I do now, live near Boston.
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Old 01-24-2020, 06:55 AM   #60
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I live in hot, humid Florida where bio issues in fuel are a bigger problem than in other parts of the US and I drive a car with a small diesel engine that is so thrifty that a tank of fuel lasts for up to six months.

Its got a steel tank however regardless of what material the tanks are made of they have to have some type of vent to allow air in as the fuel is drawn out or either the fuel pump won't be capable of pumping it out against the vacuum developing in the tank or the tank will start to collapse due to the excess vacuum.

I use Power Service Diesel Clean and at every oil change empty the fuel filter and refill it with Dexron I or II to clean and lubricate the mechanical injector pump and am at well over 250,000 miles now with the 40 year old diesel. Annually I treat the tank with Power Service Clear-Diesel and if I did notice any evidence of a Bio Issue I would likely use Power Service Bio Kleen to ensure all products used are not only compatible but actually designed to work together. The added plus is that Power Service products are available just about everywhere including Walmart and most the the big chain auto parts stores so no special ordering is required making it almost as simple as going out to buy milk.

When I treat the system for a storage event where I know I won't be driving the vehicle for months I do run it for 15 minutes to ensure the treatment makes it through the entire system through the fuel rail and back through the return line that recirculates fuel back to the fuel tank.


I don't worry about it but am aware and take reasonable precautions so I don't have to worry.
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Old 01-24-2020, 09:02 AM   #61
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Your "water in fuel" light only came "on" a couple times. My "water in fuel" shut my engine down. Bad Sensor, who knows. I just added the additive and have had no more problems.
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Old 01-24-2020, 06:10 PM   #62
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Hi Raymond,

I don't see any biocide properties listed in the product descriptions for either of those products.

IF you're concerned about protection from biologic growth in your fuel tank, you'll have to locate and add a product specifically designed to prevent the growth of biologics.

That's my opinion, based on personal experience and research. Others may have a different opinion.

Take care,
Stu
In addition to Clear Diesel, which is a tank cleaner and long-term fuel stabilizer, and the very popular Diesel Kleen, Power Service also makes BioKleen which is used to control biologics. My view is that Power Service has a long and successful history of excellent diesel fuel supplements, and I use them. However, there are other quality manufacturers out there which are reliable alternatives.
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Old 01-25-2020, 07:24 PM   #63
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Your "water in fuel" light only came "on" a couple times. My "water in fuel" shut my engine down. Bad Sensor, who knows. I just added the additive and have had no more problems.

Yes, the sensor will shut the engine down if it determines enough water is in filter, either by actual water being present or by a false reading. Just keep a eye on it!
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Old 01-27-2020, 11:54 AM   #64
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In the comments above, the Power Service Diesel Kleen detergent/lubricant additive (which is approved for use by Cummins) has been mentioned. As an alternate to adding Diesel Kleen at every fill-up, if you can maneuver your motorhomes into an Exxon or Mobil service station, the relatively new ExxonMobil "Synergy Diesel" product contains detergent / lubrication additives. ExxonMobil is the only refining/marketing company offering ULSD with additives at the pump. My company and others only offer ULSD without additives. Here is more info about Synergy Diesel --> https://www.exxon.com/en/diesel-efficient

During my journeys in the Kerrville, TX to Baton Rouge, LA "circle" around the Houston area, I have not found a truck stop that sells Exxon Synergy Diesel thus why I use Diesel Kleen with every fill-up.

The Diesel Kleen additive does not contain the stabilizer and biocide chemicals needed for long term diesel storage.
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Old 01-28-2020, 10:23 AM   #65
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I have been using KILLEM for a number of years. Was a dirt contractor and always added to fuel for diesel. Purchase at any auto supply store. Also VN class of 1968. Flew Heuys. 48th AHC
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Old 01-29-2020, 08:08 PM   #66
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In addition to Clear Diesel, which is a tank cleaner and long-term fuel stabilizer, and the very popular Diesel Kleen, Power Service also makes BioKleen which is used to control biologics. My view is that Power Service has a long and successful history of excellent diesel fuel supplements, and I use them. However, there are other quality manufacturers out there which are reliable alternatives.

Yes the three Power Service products are designed to work together and are used in different concentrations.

Personally I prefer to not use a shotgun approach and will only add what I consider the storage products for the biologics when in storage. If you use the two maintenance products for running down the road and storage then you won't likely need the remediation product to deal with a biologic infestation in your fuel tank. I will sometimes just throw in the remediation product once a year just in case however have never had an actual need for remediation due to regular treatments with the maintenance products.

See: https://powerservice.com/products/
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