try the ball pein hammer trick again... then no result,
Go to true value and get a $199 40 gallon electic tank model. Sell that junk on gee-bee-bay.
Prior to disposal, bleed out your gas line of air before starting up the rig.
I have a saw mill with a big hydraulic system with many new parts, but every now and then without a smack from the hammer on the box, it all shuts down.