LS oil pump priming

Discussion in 'General Tech' started by XJsavage, Jan 3, 2015.

  1. XJsavage

    XJsavage Warlock of Zante plantation

    Joined:
    Aug 15, 2009
    Location:
    South Carolina
    Just at the completion of my recent oil pump install, I've come to a snag. The engine(6.0) is reassembled with a Melling HP oil pump, stock truck oil pan and appropriate pickup tube. My steps towards initial crank up since reassembly have included installation of correct pick up O-ring from GM service parts center, adding correct amount of oil, disconnecting power to fuel pump to insure it doesn't crank while dry, and spinning the engine over in 5 second intervals, hoping to see oil peeking up through the mechanical OP gauge tube. I'm not seeing any signs of oil pressure or the pump picking anything up from the oil pan. I've seen kits online that inject oil into a pressure port to prime the oil pump but they are rather expensive for a one time use and I don't see sense in spending a few hundred dollars on something I'd only use once in a while. Im not 1,000,000% sure the O'ring is perfectly set and is something I'll check here shortly. Is there anything else I should take note of? Any other tricks that would help prime this pump that don't involve buying a kit? And I should mention, I dont' have any sort of compressed air supply at the location.
     
  2. rockcity

    rockcity everyday is a chance to get better

    Joined:
    Apr 10, 2005
    Location:
    Greenville, NC
    Drop the pan, pull the pickup, and pack the pump full of as much vasoline as you possibly can. Assemble, and give her a go. ;)
     
  3. Infamous1

    Infamous1 Well-Known Member

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    Aug 14, 2010
    Location:
    Pittsboro
    Had to do this on the last one I had apart for several days, worked like a champ!!
     
  4. XJsavage

    XJsavage Warlock of Zante plantation

    Joined:
    Aug 15, 2009
    Location:
    South Carolina
    Thank you very much!! That makes perfect sense :smokin:
     
  5. Croatan_Kid

    Croatan_Kid How's your hammer hangin'?

    Joined:
    Nov 4, 2007
    Location:
    New Bern
    What they said. Otherwise, you have to pressurize them with the fancy oil primer deal.
     
  6. XJsavage

    XJsavage Warlock of Zante plantation

    Joined:
    Aug 15, 2009
    Location:
    South Carolina
    ai1266.photobucket.com_albums_jj521_XJsavage_Mobile_20Uploads_IMG_20150105_195344486_zpsfe210a35.jpg
    The ole Vaseline trick worked! Had a hard time keeping a straight face texting, explaining to my buddies what I was doing exactly.... Jamming my hole up with Vaseline... Mmkay.. :lol:
    Thanks for sharing a cool trick guys!
     
  7. Infamous1

    Infamous1 Well-Known Member

    Joined:
    Aug 14, 2010
    Location:
    Pittsboro
    Yeah you will get strange looks from not in the know folks with a mondo tub of the stuff sitting around the shop haha!! Glad it worked for you.
     
  8. Jody Treadway

    Jody Treadway Croc wearing fool Moderator

    Joined:
    Mar 20, 2005
    Location:
    Hendersonville, NC
    Another trick is to loosen the oil filter and have someone spin it over until oil comes out. Just like when bleeding brakes, you gotta give the air somewhere to escape from.
     
  9. Infamous1

    Infamous1 Well-Known Member

    Joined:
    Aug 14, 2010
    Location:
    Pittsboro
    Well dang I have never loosened an oil filter while bleeding brakes!! Thanks Jody!!
     
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  10. ckruzer

    ckruzer Infidel

    Joined:
    Jul 2, 2015
    Location:
    asheville nc
    can you fellas help me understand the mechanics of this. if we are plugging the 'pickup' side wouldnt we be preventing the pump from sucking up the oil? Wouldnt it make more sense to plug the "out port" or whatever to create the vaccum on the pickup side until there is enough pressure to punch through the vaseline on the "out" side of the pump?

    ^hope that made sense
     
  11. rockcity

    rockcity everyday is a chance to get better

    Joined:
    Apr 10, 2005
    Location:
    Greenville, NC
    You prime a pump by putting oil (or whatever) in the intake, not the outlet. Same with an oil pump.
     
  12. ckruzer

    ckruzer Infidel

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    Jul 2, 2015
    Location:
    asheville nc
    im gunna do it cause i trust you guys. Just trying to understand *how* that works
     
  13. XJsavage

    XJsavage Warlock of Zante plantation

    Joined:
    Aug 15, 2009
    Location:
    South Carolina
    You apply a petroleum product into the pump so it has substance to pull/push as it spins. The Vaseline will be forced through the outlet and allow the oil at the end of tube to be sucked up into the pump.
     
  14. rodney eppes

    rodney eppes Well-Known Member

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    Feb 3, 2010
    Location:
    Mt.Holly NC 28120
    Weather or not you changed the oil filter, is it Full? Never put on a dry filter, & wait for the pump to fill it up.
     
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  15. Jeff B

    Jeff B Thanos was right

    Joined:
    Dec 23, 2006
    Location:
    Lincolnton N.C.
    This.


    ALWAYS this, not just engines either. Working EDC piston pumps. you never want an air pocket running through the charge.
     
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