I I got a new gas tank recently and swapped over my older sending unit/pump into it but the part that the lock ring holds down... It has a leak from being so old and rotted, is there anywhere Ivan buy an entire fuel pump assembly or get the parts to make a new one?

 

You can buy a new o-ring and lock ring at just about any parts store. Had to replace mine last year after losing nearly half a tank of gas by having it parked downhill and the o-ring leaked.

 

Here's the thing tho it's not te I ring or the lok
Ring it's like the actual sendin unit itself that the rubber tubing attaches to...