No leak under no or light load, lots of leak under high load, eventual leak under any load, ultimately leak even at idle. It is the same failure modality I experienced with mine. However, the more you leak, the more you will leak, and eventually load will cease to matter, as the oil that has already passed through your leak at high pressure will have done enough damage to the seal in it's passing to now pass at lower and lower pressure. The higher the oil pressure, the higher the fuel pressure, the higher the fuel pressure, the more fuel is expressed into the cylinder, the more fuel, the more fire, the more fire, the more power.įrom the Monday morning quarterbacking recliner where I sit, the correlation between your leaking operation and non leaking operation is straightforward. In the 7.3L, more fuel per millisecond of the injector being open is delivered by increasing the oil pressure to the injectors. The power that the engine needs to motivate a real load (truck and trailer) from a stand still up a hill, is enabled by fuel. Later still, when you hooked the trailer back up, and then backed the trailer up hill, the engine was under load again. The freeway was likely more or less flat. When you later test drove it on the freeway, you weren't pulling a trailer. When you lost the 5.5 gallons of oil in less than 75 miles, you were pulling a trailer.
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