battery probably has 1 dead cell.
It sounds like you have air entering the system. verify every hose clamp is tight. if that doesn't get it, I find the easiest way to spot small leaks is to presureise the system with a small pump (5-10 PSI) spliced into between the frame and the fuel filter. the lip seal on the injection pump input shaft is a common culprit for air in while not leaking fuel out.
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