No oil pressure after rebuild

[Rufi]

On my 2014 RAM with 5.7 hemi I repaired the famous hemi tick. New cam, lifters, hellcat pump with low pressure spring, mds delete and new heads.
When I turn ignition on (no crank) I noticed my oil pressure gauge needle goes half way.
I diagnosed and looks to be a faulty sensor (shorting sensor wire to ground makes the gauge go to zero).
More worrying is that I don’t see any oil coming from the sensor hole when cranking without sparkplugs. I already filled 2 quarts with a garden spray bottle via the sensor hole but no luck.
And yes, I put a new o-ring on the oil tube.
Installed the head gaskets left/right and top upwards, prefilled the Mopar oil filter.
So I assume I have 2 separate problems. Any thoughts on the oil pressure?

 

[ibike]

Not familiar with hemi’s, but if I were to guess is there a pickup tube and is it in the oil pan and is it still in the pump.
Just spit ballin to jog your question

 

[EdGs]

Have heard of this happening when the pickup tube o-ring gets damaged.

Did you prime the system via the plug above the oil filter, and verify oil flow at the rockers and valve springs?

 

[Rufi]

I was really careful with the o-ring during assembly. But I did not lower the oil pan. So I had to fiddle a little to get the tube on the pump. But still it looked good.
Priming was done via the sensor hole above the filter at the front side of the block.
Valve covers were already on, so did not check any flow there.

 

[04fxdwgi]

No oil pressure possible causes:
Could have pressure, but gauge is faulty. Install temp known good mechanical gauge to verify.
Air leak in pickup line before the pump (pump won't prime. Hole in tubing or pinched o-ring)
Pump not turning
large opening in the oiling system such as:
MDS solenoid valve not seated
VVT Solenoid valve not seated
Missing rocker arm shaft bolt allowing oil to flow freely
Oil galley plug missing

 

[Rufi]

Thanks for you replies. Problem is solved. I let the truck sit for a couple days, tried again and we had lift off!!!! Lots of oil coming from the oil sensor hole.
Sooo happy that it is solved. May be some air was trapped somewhere.
Faulty oil pressure reading was indeed a separate problem. Replaced the sensor with a 3 wire Standard brand sensor and the gauge now goes to zero with ignition on and goes half way when cranking.

 

[EdGs]

Thank you for posting the solution.

 

[crackerjack1957]

Thanks for you replies. Problem is solved. I let the truck sit for a couple days, tried again and we had lift off!!!! Lots of oil coming from the oil sensor hole.
Sooo happy that it is solved. May be some air was trapped somewhere.
Faulty oil pressure reading was indeed a separate problem. Replaced the sensor with a 3 wire Standard brand sensor and the gauge now goes to zero with ignition on and goes half way when cranking.

Sounds like the oil pump lost prime & regained

 

[madtrucker2016]

Some oil filters at times have been the problem; they have a check valve built into them. Sometimes, they are faulty, not saying yours is, but something to check. Hope it all works out, you probably busted your back working on it. Good luck