With 11.7 volts, it should be sufficient to run the pump correctly. If you are not getting the correct pressure, possible causes are :
1. Weak pump. New pumps are known to fail as well.
2. Insufficient grounding.
3. Leakages between pump and outlet. Recheck the pump to filter installation. Ensure hose between pump and filter is securely attached.
Tuesday, November 30th, 2010 AT 12:58 PM