Not only does the new fuel lack lubricity, but it spells death on the material that O-rings and seals are made of in the older injection-pumps and fuel-systems.
For the first few months after the advent of ULSD, pump shops were in-undated with injection-pumps that were leaking like sieves.
On two separate engines, I had one leaking from around the throttle-shaft, another leaking at the KSB valve = drip-drip-drip- all the time the engine(s) was running.
I started mixing a
MEASURED one-ounce per gallon Walmart brand TC-W3 two-cycle engine oil into the fuel and, within a few days, the leaks dried up.
In winter, along with the ounce/gallon two-cycle mix, I also add white-bottle Power-Service at the ratio of
measured one-ounce per three-gallons fuel.
The secret to good fuel system maintenance is to be OBSESSIVE/COMPULSIVE about the use of fuel-treatments.
This "dump some in" maybe once every fourth fill-up business just doesn't cut it.
I have a bunch of long-necked plastic bottles that I pre-measure and carry my fuel-treatments in; some for 5-, 10-, 15-, and 20-gallon mixes, labeled for winter or summer use.
