Possible Algae issues:

Rich Miller has a recent and great thread on Algae here on RCU. Please check it out. The properties of algae are such it is heavier than say water contaminates which cause it to "fall to the bottom" until pressure or suction raises it up and into the mainstream fuel flow.

If you suspect algae as the issue within the fuel system. run the turbine on the ground at wot while at the same time watching the PW. If you note a constant continuing rise in PW during this test, this is the indicator something is restricting the flow.

Sincerely,
Eric