pump won't draw from a tank
yes, a General TS2021 to be exact.
It should draw just fine, but follow my posts on "dual-feeding a pump", and "tank feed" plumbing..
all your answrs are there on how and why.
If that pump doesn't draw nice.. take the valves out, and test them individually..
If you can suck air through them, they are dirty, or worn out.also look at the plastic cages..
..they are supposed to kep the valve "poppets" centered.
Check the o-rings under the valves too.. and replace them without any question. ..prefer a Viton upgrade.
If you think you don't see the problem, look closer..
any cracks in the head under the valve o-rings ??
That gear-reduction is one of the old-beefy ones.. it's a keeper !
BTW.. wear ear plugs around that motor with no mufflers..
they are spark arresters only,
and a danger to ear drums.
..and know this.. ..most power-wash-guys are half deaf from the water-spray noise anyway.