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Dropped pan installed Kevin Hanson oil baffle pulled pickup tube a little forward to clear pan, installed everything back and now oil pressure is 0 fire a few seconds then 40 then down to 0 again but rear driver side of pan bolts were loose, what could cause this?
 

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Dropped pan installed Kevin Hanson oil baffle pulled pickup tube a little forward to clear pan, installed everything back and now oil pressure is 0 fire a few seconds then 40 then down to 0 again but rear driver side of pan bolts were loose, what could cause this?
Same thing happened to me replaced the oil pickup tube o-ring problem solved
 

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+1 on guessing its the pickup o-ring. That is the seal between the pickup tube and oil pump that sits above the oil line. Its likely you kinked that connection when bending the pickup tube forward, so the pickup is sucking air at the joint rather than oil from the end.

If the rear pan bolts were really loose you would blow oil out everywhere as that seals the pathways to the oil filter. Those seals would get positive pressure being post-oil pump in the circuit.

To troubleshoot further, you could try priming the oil pickup and pump:

1. disconnect your spark plugs or the harness connectors going to the coils so the engine only turns over and does not fire
2. remove the oil filter and place a catch can under it
3. Turn the key to crank the engine for a few seconds. My engine primed from completely dry in about 8 seconds.
4. check that you get oil flow coming out of the oil filter connection block into the catch can; Little to no flow points to the o-ring very likely pinched.
5. If you see decent flow, reconnect oil filter and ignition. check oil level from what you may have primed out.
6. start the engine and monitor oil pressure. If you have normal oil pressure, rejoice, the pickup o-ring is fine and you just needed to prime the pump. If pressure drops again, quickly shutdown, and this again points to the pickup o-ring.
 

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+1 on guessing its the pickup o-ring. That is the seal between the pickup tube and oil pump that sits above the oil line. Its likely you kinked that connection when bending the pickup tube forward, so the pickup is sucking air at the joint rather than oil from the end.

If the rear pan bolts were really loose you would blow oil out everywhere as that seals the pathways to the oil filter. Those seals would get positive pressure being post-oil pump in the circuit.

To troubleshoot further, you could try priming the oil pickup and pump:

1. disconnect your spark plugs or the harness connectors going to the coils so the engine only turns over and does not fire
2. remove the oil filter and place a catch can under it
3. Turn the key to crank the engine for a few seconds. My engine primed from completely dry in about 8 seconds.
4. check that you get oil flow coming out of the oil filter connection block into the catch can; Little to no flow points to the o-ring very likely pinched.
5. If you see decent flow, reconnect oil filter and ignition. check oil level from what you may have primed out.
6. start the engine and monitor oil pressure. If you have normal oil pressure, rejoice, the pickup o-ring is fine and you just needed to prime the pump. If pressure drops again, quickly shutdown, and this again points to the pickup o-ring.
Lots of good info here, but in addition to and more important than killing the ignition is removing the fuel pump fuse or relay. In fact, if you kill the fuel circuit, you need not worry about the ignition. You do not want to be pumping raw unused fuel into your engine and washing down the cylinder walls!
 

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I had a stuck open pressure regulator valve in the pump. Put in a melling, problem solved
 
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