I fly an Archer that has a slight yellow colored fuel that comes from the nose sump after the airplane has been sitting for some time (usually at least a week). The airplane is hangared and there are no leaks. The wing sumps show 100ll just fine. The airplane has only been fueled with 100ll for a long time.
After about 4-5 sumps, the fuel comes out blue. The yellow “fuel” doesn’t smell exactly like 100 LL, but does have a fuel smell.
No engine issues at all. Runs just fine.
If you sump 2-3 days after cleaning out the other fuel, it comes out blue.
There’s never an indication of water or other fuel types.
What would change the color of the fuel?
After about 4-5 sumps, the fuel comes out blue. The yellow “fuel” doesn’t smell exactly like 100 LL, but does have a fuel smell.
No engine issues at all. Runs just fine.
If you sump 2-3 days after cleaning out the other fuel, it comes out blue.
There’s never an indication of water or other fuel types.
What would change the color of the fuel?
