I could really use some help with an oil pressure mystery!
I changed the oil on my 1970 FJ40 (original F motor). When I started back up there was no oil pressure. Removed oil pan to inspect pump...everything looked good, nothing clogging screen, parts moved freely, no broken parts (gears etc.)
After putting everything back together and filled it back up (all 8 quarts) and removed the distributor. Ran the pump with a drill and it pumped up to 50lbs when I put the distributor back in ran fine with great pressure.
Once it sat overnight I started back up and again no oil pressure. Did the drill trick again with the same result. Pressure not a problem as long as it does not sit overnight.
Any Idea whay this is happening???
I changed the oil on my 1970 FJ40 (original F motor). When I started back up there was no oil pressure. Removed oil pan to inspect pump...everything looked good, nothing clogging screen, parts moved freely, no broken parts (gears etc.)
After putting everything back together and filled it back up (all 8 quarts) and removed the distributor. Ran the pump with a drill and it pumped up to 50lbs when I put the distributor back in ran fine with great pressure.
Once it sat overnight I started back up and again no oil pressure. Did the drill trick again with the same result. Pressure not a problem as long as it does not sit overnight.
Any Idea whay this is happening???