Quote:
Originally Posted by ToddT
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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Thank you so much for the tips. I think you may be on to something. It's wierd though because even if its stuck on vegetable oil shouldn't it fire up? I have a 90 percent veggie 10 percent diesel mix in the veggie tank. I think the pressure regulator may be stuck like you said because why is it not getting the gas it needs to run? Like I said I tried ether and wd-40 and it would not even fire up with that. I am wondering if its the injectors are clogged or perhaps the glow plugs are gunked up. I am not mechanical and certainly do not pretend to understand the diesel engine, but this engine showed no signs of having problems except for the normal sluggishness from a dirty wvo filter.
I had even been running it on diesel only for a week until my new filters came in. The truck fired up and ran perfectlyon diesel the day I changed the filter and then after the engine warmed up and I switched to veggie it lost all power stalled and has not started up since. It seems as though when I went to switch back to diesel maybe it the valve got stuck.
My mechanic is checking the valve and fuel pressure today.
