My oil pressure sender is in the rear main bearing inspection port. Since going to dual HPOP, my oil pressures have been running lower. Cold idle can be in the high 40s, low 50s. However hot idle runs 17-19 psi. This is about 10-15 psi lower than when I had a single HPOP. Plan to put a Melling LPOP in the future engine. I do not completely understand why the extra oil in the HPOP should have this effect. I do not think it is loss of oil viscosity but the first oil analyses should be in tomorrow.Ok, moved the oil sender to the filter base to get a baseline of what is actually coming from the pump. Once the truck cools, i'll move it to the location suggested by hammer.
Cold idle pressure- 50psi
Hot idle pressure- 12-13psi
Cruising at around 1800rpm i'm running around 35ish psi obviously the pressure fluxuates with RPM.
The oil drain back out of the hpop had once again returned this afternoon, even w/the check valve in place.
Do those pressures sound right for the truck?
Could it be possible that i have a lpop issue that is causing the drain back. . .i really can't think of anything else that would be causing it. The squirters for the cylinder walls would be an opening for air to enter, so i can't imagine an oil leak causing the pump to loose prime every time. All i can figure is the lpop isn't sealing well enough to keep the oil in the pick up tube. :shrug: