I have a D15b7 rebuilt it and no oil pressure. i have a new pump and if i pull out the oil pressure unit and crank over the motor it will pour oil out of the block but when i put the pressure unit in it gets nothing and the end of the pressure unit is dry. I don't understand why it won't build with the unit in!!!!!!!!!!!! any kinda info would rock and be greatly appreciated.

 

Oil pressure unit? The sender? Do you have a real oil pressure GAUGE that is telling you that you aren't getting nay pressure?

 

Did you overdue it with the RTV and clog the oil pickup or something. Try checking in and around your oil pickup tube, thats always a good place to start if you know the pump is functional

 

For years I have kept a cheap aftermarket oil pressure gauge in the toolbox for stuff like this. They're less than $20 at an auto parts store, and they use a little tube that reads pressure directly. You can install it in place of the OE electric sending unit, and verify there's pressure before startup.