Here is my take on it.
https://forum.ih8mud.com/threads/1971-fj40-pnw-blue-patina.1221851/post-14414835
Ive also tried both the Denso and Walbro Pumps in the tank. Denso is quieter* but has a higher-pitched squeal that I just picked on way too easily. Walbro is a lower hum but was downed away...