I have a PVC suction pipe line, buried, from my pond to to the motor... It appears to have an 'air' leak... What material and process(an inserted/water sealed in place (internal liner) or liquid sealer material would be great) can be use to repair any/all air leaks in the line with out first doing a pressue test of the line... THE CURRENT line has several elbows, a union and inline pvc on/off valve. If I cannot figure a way I will have to dig-up and replace the line... I assume a flexible, PVC suction would be best.
Thanks,
Jimar1:(

Have you considered putting your pump at the other end of this line. Ound pumps push water way better than they suck water. This will not fix things 100% but you'll also see where the leak is because it will trun from an air leak to a water leak.