I know this has been talked about a bunch of times and I'm having trouble finding the links. Anyway, truck starts fine cold(oil thick) drive truck and turn it off (oil thin) truck won't start. I check the HPOP regularly and this time it is low. So I top it off and it still won't start til it cools off. I haven't put a gauge on either side nor blocked off either line from it yet because I don't have a gauge not the fittings. Who has this gauge/ what type of gauge should I use? And what type of fittings are they that are needed? I also am wondering if it is the ICP or the IPR. I am only speculating here I am NOT the trained professional like alot of ya'll. Because two of the codes I have had are p1212 yesterday when the truck quit and wouldn't start and the fuel station. And p0603 today and the mechanic's garage who put a snap on scanner on it. I hope I covered alot of the questions. Oh one more thing I have removed the fuel bowl heater and checked all of the fuses all are good.