Question about 1992 Mercedes-Benz 190

2 Answers

Pump Priming Problems.

1992 mercedes 190E can't prime the oil pump. Put new housing and oil pump gear and primed it but the pressure hasn't come up yet. any sugestions?

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  • ljohn1961 May 21, 2008

    according the the haynes book the pump isn't self priming , the pump has to have oil put in the pump to start the prime sequence. A vacuum pump doen't drive the pump on this model,

    the crankshalf does.

  • ljohn1961 May 21, 2008

    this mercedes ls a gasolene engine not desel

    does the way the gears in the pump has to be in a certion way? I need some expert advice , step by step.

  • ljohn1961 May 23, 2008

    I will buy some and try it
    and let you know the out come.



  • ljohn1961 May 23, 2008

    The suction filter is clean as a whisle.
    I think I need to get the air pocket out of thesuction filter.

  • Anonymous Mar 15, 2014

    My 2008 touareg has sat for a year. i wanted wondered what i need to do before starting it again



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You should try to pack the gears and pump cavity with petroleum jelly which will prime the pump and the oil will then displace the jelly. If you use any other kind of grease, the oil will not be able to displace it so make sure you only use petroleum jelly. This is the stuff used in the medical field but works great for this purpose too. Let me know how it goes and whether you have any further questions. Thanks and good luck

Posted on May 22, 2008

  • Benjamin Patri
    Benjamin Patri May 23, 2008

    sounds good, will be waiting for the news

  • Benjamin Patri
    Benjamin Patri May 27, 2008

    Were you able to fix this, if so then please give me some feedback by
    rating my solution. If you need any more help, I would be glad to
    assist you, just ask.

    thanks and Have a Great Day!


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Oil suction filter may be clogged. Did you check it?

Posted on May 21, 2008

  • Britt Griggs
    Britt Griggs Feb 17, 2014

    Put on a brand new one,



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1 Answer

What is meant by priming a new oil pump?

A recommended practice was to pack the new pump with Vaseline jelly. I think it was to prohibit wear or friction on the pump gears at initial start-up until the oil got to them. It may have also helped create a little suction to pick up the oil. That's the only "priming" I could think of. If the engine has been down awhile and not running, disable the ignition system and crank the engine over in spurts- crank for 15 seconds, let starter cool off for one minute, then crank another 15 seconds. This will get the oil circulating all through the engine. Watch for oil in the top end at the valve cover, with the oil filler cap off. When you are sure the oil is getting topside, you can reconnect the ignition and fire it up.

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Had the pressure bypass valve malfunction on my 2.5 jeep put new oil pump in and with 45lbs. Oil pressure motor still sounds dry of oil,what gives?

it's not priming.
that grease trick helps.
is this some china pump off fleabay or a real jeep pump..???
did you do the below.:
1: the grease sure. and then prime the filter and the gallery behind the
2: With fuel and spark defeated, and spark plugs removed then with pressure gauge attached to sender port, did you crank it to get max pressure (my guess is this is the step you are posting on.)
i never start any engine, (after majors) unless i get #2 to work first the number 3, which is top end oil checks.

the pump is no priming.
In pro shops they make up a priming tool. so new engines are never
started, 1st time dry, ever.
one way is just a tank full of oil and shop air, and 2 valve.

maybe the new pumps relieve valve is stuck open, fully.
i rebuild my own classic engines, after all that work !!! i never
ever, skip these steps.
and for 100% sure, good pressure, and top end oiling on any major work.
one of the top brand pump makers. VIDEO

Feb 17, 2014 | 2002 Jeep Wrangler

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Priming the Oil Pump!

Should be self priming,it should still start,if it still turns over.

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2001 Chevy Silverado, 5.3 had only 5 pounds oil pressure, replaced sensor, still 5 lbs of pressure, replace crank driven oil pump, 0 pounds pressure, pickup tube good, o-ring installed correctly on pickup...

remove the pump and the cover off the gears
fill the spaces of the gear teeth with Vaseline or clean grease
this is priming the pump so that a vacuum is created to suck up the oil
new pumps will not be primed
the grease /Vaseline will dissolve in the oil and will not cause any problems

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I have just rebuilt a mazda va engine out of a forklift. While priming the oiling system I am not able to get more than 10psi. I have checked all the normal stuff as I am a engine machine shop owner and...

how are you priming the system
before installing the oil pump , you fill it with grease or vaseline
That primes the pump so that when you start cranking it it is producing pressure
to get pressure you need volume and there will be no way that you will get the volume required other than by the pump

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Wont start unless manually primed

Turn the ignition key to the ON position without starting the engine

You should hear the fuel pump priming for about a few seconds then shutting itself off.
If not hear replace the engine oil pressure switch
The 3rd wire to that switch is the pumps prime switch lead.
When the engines oil pressure is reached the computer will shut that circuit off and turn on the fuel pump relay
If you hear the pump prime the relay maybe at fault instead

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Primer on an oil pump for a 1999 jeep ? put new oil pump on but its not priming and not sure what to do

Best way to draw a prime is to put a long screwdriver blade (no handle) attached to an electric drill down into the oil pump drive slot (distributor removed). I actually use a distributor that has the top cut off without the cam gear, and just attach the drill to the shaft, but the screwdriver works pretty well too.
Only other option is to pack the inside of the pump with light grease, but that would require pan removal and I doubt you want to do that!!
Many pumps are replaced because of low pressure but the cause is generally a bad bearing...If that's the case you may find it difficult to prime.

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Oil pump is self priming. You do not need to prime it. If not showing oil pressure, the sensor is probably defective. Make sure oil level is not low. If the vehicles water temperature gauge shows normal when running then oil pump is working fine. If it goes to the overheat mark then you may have defective oil pump, which is rare. Most temperature gauges go past the middle when you first start up but then drop back to normal once the engine thermostat opens up. Hope this helps.

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1992 dodge w-250, took her in for a service...bleed fuel lines...

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