The Inside of my fuel tank after 20 years

[Halo]

My boat is now 20 years old and I decided to have a look inside the fuel tank. I fitted a Wema FLB access hatch using a 115 mm hole saw. A relatively easy job after I fitted 375x375 hatch in the quarter locker to gain access to the top of the tank.
The photo shows what I found and as you can see there was very little muck. Just needed a wipe with dry rags.
It shows that keeping the tank full and using grotamar works well!!

 

[Refueler]

The regular dosing is the matter that keeps you going ... tank full or not is open for debate.

They say - never buy a mechanics car .... well I fall into that category ... I can advise and help regarding contamination and treatment of fuel ... but I am 'lazy' when it comes to my own ... BUT I use an enzyme based 3 - 4x a year ... basically when my tank is very low and I fill up - I add a decent amount of additive ...
The last time I had any problem was 2011 .... I took a large volume in Swedish Islands after crossing Baltic and a few days in the islands ... few days later - literally 4 - 5 days .... in Mariehamn (Finnish Alands) - cough splutter ... engine died !
I didn't have my usual additive with me and no-one had anything in the small places we stopped ... was an eventful remainder of cruise ! If we couldn't just sail - it was motor ... clean filter ... motor ... clean filter ....