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Paul,
Diesel fuel storage, especially in humid climates requires a little more TLC than drier climates. YES, I would recommend using one of the multipurpose additives that are commercially available.
I use Stanadyne Performance Formula which is a mixture of all of their single purpose additives. It includes chemicals to stabilize the fuel, clean the injectors and pump(s), an algicide (important for you), water emulisifier, cetane booster, anti-gel additive for winter use and most important, extra lubricant for the pump. Low sulphur fuels suffer in this area.
Stanadyne is a pump manufacturer and has developed this line of products to offer longer life and dependable service.
You can get it online for around $6 a bottle which treats 60 gallons. I added two bottles the first time to my 95 landyacht wide body and add a bottle every time I fill up (60 gallons or so). Adding more does not hurt anything but the manufacturers website says it will not enhance the capabilities.
I maintain a fleet of large Cummins generators and buy this stuff in 5 gallon pales for use onsite. This product has never failed with some of our tanks storing a large amount of fuel for several years before being emptied and refilled.
I highly recommend this product. One thing you will immediately notice is the reduced black smoke on high load. The whole thing seems to run cleaner.
I have to ask how you improved the exterior appearance of your coach. Looks nice. Did you paint it? Mine is highly oxidized as it was my parents and sat in a storage lot in Fort Pierce for the last 4 years. I have used every product I can find including Policoat with no success.
Ed
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