i have no oil pressure in my 350. i pulled the distributor out and hooked up a priming tool and the drill bogs down like it is produceing oil pressure. but there is no oil shooting out into either one of the heads and the sending unit doesnt read any pressure.

for a little more background info i just recently rebuilt the engine. no machine work or anything just new bearings and rings. i got the engine running and broke in the cam. holding it at roughly 1500-2000 rpm. during which time i had plenty of oil pressure. roughly 30 psi. i shut it off and had to go somewhere and when i came back about an hour later i fired it up and it didnt have any oil pressure. the guage would hit zero and kill the power to the fuel pump.

oh and its a 91 tbi system.

EDIT: forgot to post my question.

what else could be wrong? need some troubleshooting help.

 

Are you hearing noises? 0 oil pressure, if it really is 0 psi, you would hear things knocking and clattering around. A drill can't spin an oil pump fast enough to produce pressure like running the engine can.

Verify pressure with a mechanical gauge, try replacing the sender. And if your pump is cutting off when the opsu cuts out, I would look into how your fuel pump power system is wired, unless you rewired it as such.

 

its in an s10. with my last s10 the oilpresure sender went bad and i was told it was like a safety feature for the engine. and i know this oil pressure sender works becasue its the one i replaced in the last truck. like 10k miles ago.

im using an air drill so its spinning pretty fast. fast enough to make a difference. i know people who have used one before to prime the pump. but i put the dis. back in and just bolted it down. didnt hook wires up or anything. and used the starter to crank the engine over and check for oil shooting out of the heads. and nothing..

EDIT: and no i dont hear any noises. well loud ones anyways. its just open headers right now. till i can get it running and to an exhaust shop.