I am in the process of de-rusting the tank on my '07. filled it wit oxalic acid yesterday, went to drain some off today and shake it around with a short length of chain inside, couldn't get more than a dribble from the longer blue hose on the right, didn't get nada from the other 2, fuel cap open,

all I can think of is they are plugged with rust particles, I ran a long zip tie up the hose that was dribbling, didn't help any, should I blow air in ?

California spec tank

I'd say that you should remove the fuel pump/sender and not be running that crap through it.

But what you are missing is the pressure line is out of the fuel pump, you are not going to get anything to come out unless the pump is running. The other lines are a vent and fuel return and should be open near the top of the tank.

Hopefully you didn't damage the pump/sender with the chain

fuel pump assembly is removed

Not in that picture. That round plate needs to come off

not sure how you can see thru the plate, it came off, the assembly was removed from the plate, and the plate was put back on without the fuel pump to cover the 3" hole in the tank

Try to stay with me here. If you want it to drain, you remove the plate. That fuel line gets mounted high on the pump you say you removed. How in the world are you going to drain the tank through it. Especially since that round protrusion will remain full of what ever stuff you poured in and most of the rust debris

I want to drain it before I remove the plate, I don't want 5 gallons of acid coming out all at once, once I get the acid out, I will flush the tank clean

Try a siphon from the fill opening. You guys are getting hung up on what holes let the fuel out. or open the fill cap and dump it from there?
Full gas tanks are a bugger to fumble with aren't they?

You don't want to dump it oxy acid damages paint. Siphon is good. I sure wouldn't shoot compressed air through a tank of acid.