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Hi, and welcome! You're on the right path. To try and answer your questions:
It's normal for the fuel to back down to the fuel heater on shutdown.
The banjo bolt on the back of the IP is a fuel pressure regulator. (spring and ball)
The fuel strainer in the tank is likely plugged. Mine was plugged with black slime from regular diesel fuel. I can't imagine what would be in there from veggie oil.
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-Evan
Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63
Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250
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