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Sounds like it is time to physically clean the tank.

Beyond that install a drag needle vacuum gauge and then you will know when the primary filter is in need of replacement. The drag needle can be looked at any time as the pointer stays at the highest vacuum...


In 2009 I replaced the fuel tank in our boat and put in tappings for a dedicated fuel polishing system.. Amazing to say the least. The inside of the tank is still 100% spotless & shiny.

Our primary and secondary filters are now in their 5th season! Just checked them on Sunday when checking the polishing filter and they are still beautifully clean and showing 0 vacuum.... Normally I would replace them annually but I just want to see how long I can go...;)
 
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