LS3 no oil pressure (prime)

[vstol]

I am getting ready to fire up my Blueprint 427 which has been dyno'd before I received it. I have the auto meter conversion electric oil pressure and temp adapters on the back where the original oil sensors were. I have a tee setup with the temp sending unit on top and the oil pressure on the 90 (horizontal) . I have the fuel pump and ecm off and when I was turning the engine I did not get oil pressure. First question does the oil pressure unit need to be straight up and have the temp on the horizontal? I do not think there is room for the oil pressure sending unit to be in the vertical. Thanks

[dhutton]

Originally Posted by vstol

I am getting ready to fire up my Blueprint 427 which has been dyno'd before I received it. I have the auto meter conversion electric oil pressure and temp adapters on the back where the original oil sensors were. I have a tee setup with the temp sending unit on top and the oil pressure on the 90 (horizontal) . I have the fuel pump and ecm off and when I was turning the engine I did not get oil pressure. First question does the oil pressure unit need to be straight up and have the temp on the horizontal? I do not think there is room for the oil pressure sending unit to be in the vertical. Thanks

Orientation of the sensor does not matter. How long did you crank it?

Don

[vstol]

Update I just tapped the cavity plate over the oil filter and same thing. I only cranked it each time for about 10 seconds. .

[gray86hatch]

Just start it or use a primer on it. Cranking the starter is just hard on parts.

Tim

[dhutton]

Lots of opinions in here:

https://lateral-g.net/forums/showthread.php4?t=52185

Don

[CamaroAJ]

Check it with a mechincal gauge? If you have no pressure and it's had it at one time chances are the bypass in the oil pump is stuck open.

[vstol]

Originally Posted by CamaroAJ

Check it with a mechincal gauge? If you have no pressure and it's had it at one time chances are the bypass in the oil pump is stuck open.

which means ...whats next
Thanks

[dhutton]

How many times did you crank it?

Don

[jlwdvm]

I recently started my Texas Speed LS3 after priming it with an home DIY primer taped into the oil galley at the front of the block on the driver's side. Even after priming with Joe Gibbs BR oil it took longer than a 10 second cranking to build oil pressure up to 40psi when I primed with the starter (after my initial priming). I had a mechanical gauge tapped into the area above the oil filter. After priming it fired right up and had 60+psi at idle on my Racepak dash.

[vstol]

Originally Posted by dhutton

How many times did you crank it?

Don

(5) 10 sec bursts