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Are you using a Pollak 6-port valve? If so, sounds like it's stuck on veggie.
If you've selected the diesel tank and you turn on the key, it should fill up the fuel filter bowl with diesel in less than a minute. Seems that the stock fuel pump turns itself off automatically after a few seconds if the engine doesn't crank. I assume it's a safety switch. In any case, it may take a few cycles of the key to fill the filter housing with diesel. Test for fuel by opening the yellow drain valve on the back side of the filter housing.
Are you running a single pump or separate pumps (one for diesel, another for WVO)? If only one pump and you're not getting diesel, I'd bet your 6-port is not switching back to diesel. This is why I went to a standard 3-port solenoid. If it fails, it will default to diesel.
How to test the 6-port? I'd remove the fuel lines (feeding the 6-port) and put them in a small container of diesel. You'll be able to tell which one draws the fuel... and therefore if the 6-port is working correctly.
Another possibility is the factory fuel pressure regulator may be stuck in the open setting. I've had trash get in there and block the spring from shutting. Therefore it wouldn't ever build up any fuel pressure.
This is why I've added a few quick couplers on my system for diagnosing problems. Also why I went to two separate pumps.
Good luck... keep us posted on your developments.
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2002 F-250 Lariat, PSD, CC, short bed, 3.73, auto tranny, Line-X bed liner, AFE Filter, HX crossover, intake heater delete, Evans NGC+, Dieselsite 203 thermostat, coolant filter, Amsoil by-pass filter, Schaeffer's synthetic blend tranny fluid, Bob Riley's tranny filter, Velvet Ride shackles, Rancho 9000 shocks with in-cab adjustment, 60 gallon aux tank for burning heated WVO, burning veggie since fall of '04.
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