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  1. #1

    Simple oil pump not so simple

    I replaced a seized oil pump today on an older oil furnace with same rpm, rotation, and gpm. Simple right? I called for heat and started the bleed and as I got a solid fuel column, system cut out on safety. Hit the reset button to finish the bleed and now it won't bleed, nothing comes out of my bleed port. When I installed the new pump, I replaced the coupling and verified the motor was turning the pump, it was. This pump is a single stage 2 pipe system (supply/return). This suntec pump requires a small plug (5/32) be installed in the return port before hooking up the return line, which I did. I also verified no obstruction from tank to filter by syphoning, yummy. The filter is also brand new and the cartridge clean. I tried several times to bleed with no sucess. Pump press. was zero with no fuel of course. What gives?

  2. #2
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    hook a vacuum gauge on the inlet, see what's going on there.

    we are not there, when you hit "the reset button" did the burner motor come on?
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,721
    Moved to Tech to Tech forum.
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    How many times must one fix something before it is fixed?

  4. #4
    yes, the burner motor comes on each time.

  5. #5
    Join Date
    Feb 2008
    Location
    Altmar, New York, United States
    Posts
    4,268
    did you try supplying oil from a differant source? process of elimination.

  6. #6
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    One I had one where the pump coupling stripped but only would disengage at a certain point, I kept manually spinning the blower wheel and finally I noticed the dead spot, I know you replace it but maybe have another look.

  7. #7
    Join Date
    Jan 2013
    Posts
    20
    Sometimes it takes a few starts to draw a vaccume and start the flow from the bleed port. You can jump out the eye and let it run with the bleed port open without it going out on saftey. If still no luck verify gravity flow from the tank. There is the possibility of a bad pump out of the box or some problem with the coupling.

  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,721
    WAG. The Op didn't close the bleeder as soon as the burner shut off and the oil dropped back into the tank. Now the pump gears are dry, and it isn't able to pull as high of vacuum to get its prime back up. Worse yet, probably didn't need to bleed it in the first place.
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    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  9. #9
    Join Date
    Oct 2009
    Location
    Raleigh, NC
    Posts
    790
    I agree with been there. It probably needs to be primed once or twice by pouring oil in the pump housing. If it is two-pipe, and the tank isn't terribly high or low in comparison to the pump, it shouldn't need to be bled after this.

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