Join Date: Apr 2008
Location: Beeville, TX
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You can pour oil into either hole on top of the reservoir, and they both go to the same place. You really can't get an air bubble into it. You really don't even need to fill the reservoir before you try to start the truck if you have drained it. I do, because usually when I have drained it, it is because I have pulled the high pressure pump, injectors, drained the rails, etc. It makes sense to fill it back up to make the start up quicker.
I've done it without filling first. The truck takes about 30-40 seconds of cranking before it will re-prime the oil rails.
For a truck that is just getting a reservoir oil change, there should be absolutely no problem just cranking it with dry reservoir. The low pressure pump has such a massive volume that it will fill the reservoir before the high pressure pump even starves for oil.
If you don't believe me, start the truck without the fill plug in the reservoir, and see the oil fountain. It will be huge. It will fill the reservoir in a second or two.
Eli Benson - EMT, Ambulance Mechanic
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance