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  1. #1
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    Default JP oil pump priming instuctions

    Hi all,
    Looking for some assistance.
    Just finished a 304 rebuild.
    The motor is fitted with a JP performance standard oil pump.
    Instructions provided with the pump in regards to priming are to fill oil filter, remove sender switch and add oil until full and no bubbles etc. tried this without success. Started engine with gauge connected and no pressure when running. Also tried forcing oil into the switch hole and also tried sucking up the oil through same hole with no luck. A few searches on line suggests the vasoline trick however the instructions provided with the pump strictly say not to do this as it will void warranty. Any body else used these pumps and had similar issues or can provide any suggestions.
    Cheers

  2. #2
    Do you ever leave? EH179's Avatar
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    Packing Vaseline between the gears is your last resort in this case...

    Never lost an engine in 37 years of playing...

  3. #3
    Do you ever leave? immortality's Avatar
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    The vaseline trick worked for me. BTW, how will they know?

  4. #4
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by Gbarlett View Post
    Hi all,
    Looking for some assistance.
    Just finished a 304 rebuild.
    The motor is fitted with a JP performance standard oil pump.
    Instructions provided with the pump in regards to priming are to fill oil filter, remove sender switch and add oil until full and no bubbles etc. tried this without success. Started engine with gauge connected and no pressure when running. Also tried forcing oil into the switch hole and also tried sucking up the oil through same hole with no luck. A few searches on line suggests the vasoline trick however the instructions provided with the pump strictly say not to do this as it will void warranty. Any body else used these pumps and had similar issues or can provide any suggestions.
    Cheers
    that method has always worked for me... always

    never fill the body with grease or vaseline, you can break the
    pump drive shaft very easily (seen it happen a few times unfortunately)
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  5. #5
    casual poster JaseQ314's Avatar
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    Pull the pump, squirt a little bit of engine oil or assembly lube in between the gears, spin them a bit to get the oil around them so you can hear them sucking/squelching, bolt the pump back on and you should be in business.

  6. #6
    Part of the furniture monaroman76's Avatar
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    Quote Originally Posted by JaseQ314 View Post
    Pull the pump, squirt a little bit of engine oil or assembly lube in between the gears, spin them a bit to get the oil around them so you can hear them sucking/squelching, bolt the pump back on and you should be in business.
    Yep, exactly. Ive seen some people pack them FULL with vasoline, I suspect this might be where the issues Smitty is referring to can occur. I've only ever put a bit of assembly lube between the gears, rotated it, added a little more and so on.. never had a problem and always got oil pressure quickly.

  7. #7
    Part of the furniture Deuce.'s Avatar
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    Quote Originally Posted by monaroman76 View Post
    Yep, exactly. Ive seen some people pack them FULL with vasoline, I suspect this might be where the issues Smitty is referring to can occur. I've only ever put a bit of assembly lube between the gears, rotated it, added a little more and so on.. never had a problem and always got oil pressure quickly.
    I agree, just enough in the gears for sucking noise while spinning so the oil is sucked up. Packing them full solid sounds crazy.

  8. #8
    casual poster Willie's Avatar
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    I fitted a JP standard pump and putting some petroleum jelly in the gears was the only way I could get it primed. I tried pumping oil into the sender switch but that did not work.

  9. #9
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by monaroman76 View Post
    Yep, exactly. Ive seen some people pack them FULL with vasoline, I suspect this might be where the issues Smitty is referring to can occur. I've only ever put a bit of assembly lube between the gears, rotated it, added a little more and so on.. never had a problem and always got oil pressure quickly.
    some Assembly lube is fine... I leave some inside whenever I rebuild a pump/check out a new one
    (maybe that's why mine always gives pressure within a second or 2 on startup)

    but
    I have seen those who fill the space in the pump body with grease or vaseline and wonder
    why the pump never delivers... coz the drive shaft broke!
    __________________________________
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  10. #10
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    Well this morning I woke up one happy rooster, and a good looking one at that.
    I now have oil pressure, 50 psi at idle. The last thing I did yesterday before I called it a day was to get a hose into the sender hole with an oil can on the other end and pump the entire can into the oil pump. I left the hose pointing up over night as oil was running back out.
    After reading everyone’s advice i was ready to remove the pump this morning however though I would hook up the pressure tester one more time. Gave it a crank and there was pressure. Happy days.
    Fitted the oil pressure sender unit and the dash gauge shows good pressure.
    Went for a test run and now no pressure showing on dash gauge.
    I think it’s a wiring issue ( VC commodore with 304 conversion so wiring is a bit messy) as the sender has 10ohms at rest and 15kohms at idle. Oh well a little job for news years day. Thanks to everyone that replied and all the best for the new year.

  11. #11
    casual poster JaseQ314's Avatar
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    It's great you got it sorted, I think it's safe to say after this experience you won't ever start another fresh 308 without oil pressure.

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