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Mine was the injection pump. Worn tolerances getting to big when hot to start. It ran fine but couldn't build enough pressure when cranking to start. Started fine cold. My injection pump guy said he'd seen a lot like this lately and felt it might be the new ULSD. He tells me he adds 1 quart ATF at every fillup on his rig. I did a final test on mine before sending it out for a rebuild, 80% waste motor oil / 20% diesel, it worked fine and started cold and hot which seems to back his theory of warm tolerances. That blend is way heavier than I ever run, kind of like putting heavier oil in a worn out engine for better oil pressure, it's just a bandaid on the real problem. Not running any WMO right now as I'm building a centrifuge to make sure all the metal particles are out of the oil then I'll filter to 0.5micron absolute and run less than 50%. Just a side note.
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1986 F350 Crew Cab 2wd SRW. 1991 7.3 IDI, T-19 4spd Sterling 10.25 3.55, 12" HD clutch. A Banks waste gated turbo. 5" cut down Peterbilt stack. Midwest rebuilt IP turned up. AC Delco 6.5 GM 12V GP's, working great. Running W85 high performance zero-gel diesel! D60 front conversion, 4wd conversion, dually conversion, and steel flatbed conversion now underway. Man those frame rivets are a pain!
1966 Porsche 911. 1983 911 SC engine with modified Zenith carbs, headers, 911S brakes, custom fuel rails, MSD 6al box with timing computer, 1974 IROC body kit. 1850lbs, 200rwhp, total blast to drive.
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