Is your pump shifting too much?
Is the pump losing pressure?
You may have contaminants in the bottom check ball. Erratic shifting can be a symptom. Before you spend big money and buy a new pump, check this area first. You could save yourself a lot of money in downtime and not need to buy a pump.
See No. 18 & 19 below.
If you are continuing to experience issues, please contact us. We can provide free telephone technical assistance. We offer pump rebuild services also.