Riffraff Diesel Technical Knowledge Center
Riffraff/Eaton 7.3 Powerstroke HPOP JIC Lines - What's the real difference?
Aug 12th 2026
The factory 1999–2003 7.3 Powerstroke HPOP lines use quick-connect fittings at the cylinder heads and high-pressure oil pump. They worked, but after more than 20 years of heat, vibration, oil ex
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Exhaust Back Pressure Tube Issues for the 1999–2003 7.3 Powerstroke
Aug 9th 2026
The 7.3 Powerstroke exhaust back pressure tube connects the passenger-side exhaust manifold to the EBP sensor mounted near the front of the HPOP reservoir. That tube lets the sensor read exhaust press
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7.3 Injector O-Rings vs. Injector Cups: How to Tell Which One Failed
Jul 24th 2026
A 7.3L Powerstroke can make a simple leak look like a much bigger problem. Fuel in the coolant? Oil in the fuel bowl? White smoke? Hard start? Miss? Coolant puking? Random rough running after injector
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FoMoCo vs. Alliant IPR Valve: What’s the Difference?
Jul 15th 2026
For a 7.3L Power Stroke IPR valve, the two solid choices are FoMoCo/Motorcraft and Alliant Power. The cheap “OEM-quality” valves are where the trouble usually starts. So what’s the d
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OBS 7.3 vs. Super Duty 7.3 Differences That Matter When Ordering Parts
Jun 27th 2026
The 7.3L Powerstroke ran long enough that people started treating all of them the same. That is how wrong parts get ordered.
A 1996 OBS 7.3 and a 2002 Super Duty 7.3 share the same basic engine family
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