No oil pressure on start up after oil change.

[BSB67]

Filter would have to be blocked inside.. allowing no air to exit, as the oil goes from sump to pump, into outside of the filter then to the engine through the middle of the filter.

Thank you.

Yep, agreed. An oil filter that would not let air pass through would keep a pump from priming.

But fundamentlly, it is a filter. How could it possibly not let air through? Do you really think that this is a likely cause? Maybe a tight drain-back valve?. Honestly, I don't see zero air flow. And I understand that quality sucks today.

Another question: Those who think that there are no quality oil filters now that WIX might be make made off shore, is that only for old Mopar big block filters, or all oil filters? Thousands of oil filters get changed out every day on cars, do they all suck?

Here is my guess to the OPs condition. The conditions were right for the pump to loose prime, it was slow to regain prime, but he shut it off before it did. Not necessarily the filter's fault.

 

[1967coronet]

Update, went to napa after work and bought a napa gold filter 1515
( made in USA ) on the lable still looks identical to the wix.
pulled the old , screwed on the new one dry as allways fired it up and pressure popped right up to normal. Top off the oil again.
Did the pump loose prime ?
Bad filter?
Relief valve stick ? I have no idea all i know is the old gal is back to normal.
Thanks for the replies and info.

 

[Moparfever65]

Filter would have to be blocked inside.. allowing no air to exit, as the oil goes from sump to pump, into outside of the filter then to the engine through the middle of the filter.

Or possibly the case was distorted preventing a full seal on the gasket, allowing air to leak in. Most general pump prime problems I've seen were air leaks on the suction side.

 

[BSB67]

Or possibly the case was distorted preventing a full seal on the gasket, allowing air to leak in. Most general pump prime problems I've seen were air leaks on the suction side.

Everything on the filter is on the pressure side of the pump. If anything on the filter leaks, only oil comes out, no air goes in

 

[RemCharger]

Or possibly the case was distorted preventing a full seal on the gasket, allowing air to leak in. Most general pump prime problems I've seen were air leaks on the suction side.

Everything on the filter is on the pressure side of the pump. If anything on the filter leaks, only oil comes out, no air goes in

This all leads to the possibility of a crack in the p/u tube threads

 

[flyingfeathers]

I changed oil on all kinds of brands and motors and never had a problem! I would think there is a problem else where gentleman.

 

[Chilsam]

Burb the filter....

 

[Mackman]

I changed the oil and filter on my 440, recent build with a new pump, Wix filter. Started it up, no oil pressure. Scared the crap out of me, pulled the filter, pulled the pump. Couldn’t find anything wrong, got out another filter, half- filled it with oil, put it all back together, started up with regular oil pressure. What caused it? I don’t have an answer, but I started putting oil in the filter, hasn’t happened since.

 

[dvw]

Recently my 200,000 Grand Cheeroke lost nearly all its oil pressure. Read 6 psi on the gauge. Sounded fine. Towed it home. The 3.6 engine uses a cartridge style filter, so it makes inspection easy. Pulled the filter to inspect for debris in case there was engine damage. Zero debris, but it looked like a filter used in a vacuum cleaner that had colapsed inward. All the pleates were stuck together. Installed a new Mopar filter, 82 psi. My son had the oil changed at Valvoline about 2500 miles previous. Filter was "made in Korea". I had purchased it from him a few months previously. Been driven a month since with no issue.
Doug

 

[gtxrt]

Started it up, no oil pressure

how long did you run it ?

 

[Mackman]

how long did you run it ?

Maybe a minute or less. Sounded noisy, checked the gauge, shut it down.

 

[Daves69]

Yep, agreed. An oil filter that would not let air pass through would keep a pump from priming.

But fundamentlly, it is a filter. How could it possibly not let air through? Do you really think that this is a likely cause? Maybe a tight drain-back valve?............

IMO, it seems logical if the valve is stuck to the filter inlet face it may not allow air flow through the filter possibly hindering oil pickup for the pump. Worth a check before install?
BTW, I've always half-filled BB filters and spin 'em on as fast as possible.
Then more clean up on aisle Mopar!

 

[padam]

If I’m not mistaken, lifting a fluid via vacuum is not an easy thing. So if the oil drains out of the pump it has to draw air first. It’s not inconceivable that a worn pump might not be up to the task.

I don’t know how many other engines have an external bolt on pump like bbm. My first big block car, 73 Newport 400, lost oil pressure once. I bolted on a new pump and all was good. I thought that was the greatest thing since sliced bread, but the location and multiple seems may be more of a weak point.

Also, a little spilled oil doesn’t bother me. Toyota engines are sealed up tight as a drum and I’ve had two that the K members rotted out.

 

[Splangj]

I always fill the filter with as much as it will handle without spilling while installing. It helps get pressure up sooner period. Since the engine is still warm, I start it and IDLE it. I don’t rev until pressure is there. One minute without oil is not good. I’d shut it down after 5-8 seconds. I’ve fired up my BB after a year of sitting numerous times and always gotten instant pressure. Apparently the factory never primed filters and didn’t have issues. I’d imagine that pump could suck the skin off your hand.