Could the residue in the tank be a product of mogas storage in plastic 5-gallon containers? I have noticed that if I store mogas (Premium 91 auto gas) in red plastic 5-gallon containers for more than a couple of days, the fuel takes on a pinkish hue which may be a product of the fuel's (ethanol's?) interaction with the red plastic? Or, it may be some initial form of "phase separation"?
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 670+ hours (as of Sept 2018)!
through June 2019.
Last edited by DHeal : 09-12-2014 at 12:26 PM.