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If the cut off in a fuel pump is not working, possibly a bad regulator. Would that cause a fuel pump to lose it’s prime? The pump I am referring to is a suntec m# AV2A-7116 installed on a Beckett AFG burner. The burner is on A Rheem furnace installed in 1996. The furnace had a bad ignition transformer that I replaced last weekend. The furnace had not been serviced, or even operated in sometime, so I went ahead and cleaned it out, changed the oil filter, nozzle and pump strainer. The oil filter housing was halfway full of mud, and dirt. Once the burner was restarted, all seemed good. All combustion readings were well within range. The burner ran for two days and then locked out.I went back and there was no oil delivery to the nozzle. Bleed it back off and the burner started right up. One thing I did noticed was that the pump was drawing 3” of vacuum while running, and initially was holding 3” when it was off, once I was finished I did not check the vac. Reading for fear of having to re bleed the pump.This is single pipe setup, with the tank located in the same room as the burner 30’ away, with about 8’ of that up from the tank, then five feet down to the burner. There are minimal fittings from the tank to the burner and I soaped them all down and did not notice any soap being drawn into the fittings. The only thing that I noticed out of sorts was that the cutoff pressure fell below 20%, but did not go to 0, and that when the burner was off the vac. Gauge read 3”. This second trip I bleed the unit three separate times for 15 seconds each, and did not see one air bubble. Could it be that I did not do a though enough bleeding job the first time, the pump is failing, or there is an vac leak that I can find? The oil line is ran exposed in the ceiling, and there is a total of 6 flare fittings. Thanks to all