Pump Priming Problems.

https://www.youtube.com/watch?v=84r6WMxMizE
Priming should be done if the pump is new or has been drained. Most pump are not self priming.

The replacement oil pump could be defective or installed incorrectly.

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
filter.
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
http://www.youtube.com/watch?v=tOYLlr8uQ8k
NEVER !

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

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

You have to prime the oil pump using a special tool... it goes down the distributer hole yes, you have to remove it.. make sure you mark it carefully!!!!!!!!!..
350 Chevy oil pump prime
Priming the oil system on new small block Chevy
Oil pump installation 350 chevy
Priming the oil pump
oil pump priming tool direction of rotation Third Generation Body Message...

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

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

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.

It sounds like you are talking about a diesel engine as gas engines are self priming. Lift pump or primer pump may be defective. Check for loose fittings or lines and damaged o-rings at filter housing. Sounds like you are sucking air somewhere.