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MDE-4334C Atlas Start-up and Service Manual · April 2008
Hydraulic/Mechanical Components
Pumping Unit
Sump for 9850K
Sumps do not need a periodic inspection, unless leaks or problems occur. Careful
troubleshooting will help determine whether to replace the entire sump or individual parts.
Service Tips
Read and follow all safety precautions as outlined in the
Sump overflows can be caused by:
• Defective sumps
• Air in pumping unit inlet lines
• Wrong sump type installed
• Internal sump float stuck
Refer to
to help determine possible causes.
Above ground tanks must have a pressure regulator valve installed at the base of the pump.
Installation at other locations can cause flow or sump overflow problems. Ask Gasboy for the
valve type and follow the manufacturer’s instructions completely for installation.
Sump Overflows
Use the following table to help troubleshoot sump overflows.
If Sump Is Overflowing
Check These Items/Probable Cause
Only in bypass
With above ground tank
Anti-siphon valve
With tank less than 3 feet of
product
Replace pump
Sporadically in bypass
• Small air leak (check all connections).
• Missing or defective check valves
• Leaky piping
Only at start-up
• Missing or defective check valves
• Leaky piping
Only at full flow or both full flow and bypass
• Air leak (check all connections)
• Shared suction lines with missing or defective
check valve
• Leaky piping
If, after checking the above probable causes, the sump continues to constantly overflow in full
flow or shortly after being placed in bypass, then replace the sump.