Originally Posted by jackofalltrades1980
I have a problem on my 95 F350 7.3, after trying a fuel blend.* First, I built a fuel processor that uses a 1/2HP water pump and house water filter with a 2 micron filter to filter the WVO.* I prescreen the oil prior to putting it in the processor.* I blend it before running it through the processor so its already pretty thin to begin with.* The stuff runs just fine in my homemade diesel generator, even when its cold outside, but anyway....On the truck I tried a 50/50 blend of diesel/WVO and ran the truck a while.* It always started up pretty good and would idle smoothly, in fact smoother and quieter than on regular diesel.* I drove the truck a couple of times to and from my job (approx 70mi round trip), then on one night when driving back when I started getting up to highway speed (70mph) the motor started to stutter a little and the fuel filter light came on.* I figured that the oil mightve thickened up since the night time temp probably was around the 50ish degree range.* Long as I stayed around 60mph or lower, it was fine.* Next, I checked the fuel filter, it wasnt clogged up with visible fat or other crud so I restarted the motor, it started just fine, ran at an idle for a long time, took the throttle good too.* Even though the real test would be to put it under load.* I kinda figured that the mech. fuel pump mightve not been able to draw the blended fuel up into the filter housing fast enough to supply the engine when its running at high speed under load so it would create a "fuel filter" problem.The real problem started then when I tried another fuel blend (dont anybody burn me in effigy).* This time I tried a blend of approx 80%WVO to 20% gasoline.* Now when I mixed this stuff, it mixed up to be thin enough to compare to diesel (it seems).* I tried a small sample in the fuel filter housing and it started and ran good, so I dumped some in the fuel tank.* At that point we did our weekend drive to town to run errands.* The truck ran good and started doing that "dont wanna go above 70 for a long period of time before turning on the fuel filter light and stuttering" crap again.* So, again I kept my top speed below 65 to stop that problem.* We drove around all day from around 3:30PM going to different places, until we finished our final task around 9:00PM give or take.* At that point we're heading back home, and all of a sudden, the truck just stopped.* I tried starting the thing to no avail.* A couple of times it acted like it wanted to start but nope.* Then it seemed like after sitting a few minutes, the crazy thing started right back up like nothing happened.* So we continue on home again, this time running on regular diesel from the other tank.* The truck ran for about 5 min and stuttered a couple of times then BLAH, died again.* Same crap, wait a few min, start right back up.* By this time we called a tow truck.* While waiting, we started the thing back up again after sitting and let the thing idle, damned thing idled for approx 30 min while the truck came.* He then started escorting us and again, ran for 5-10 min, on diesel now, and BLAH, died again.* This time, tow truck guy hooked us up and pulled us home.* Got back home, dropped the truck, damned thing started again just fine, drove it into its resting place in the driveway.* The tow guy said it sounded like the injection pump possibly, maybe building up too much pressure and just stopping until the pressure went back down to an acceptable level.* Sounds possible, but Im welcome to more possibilities before trying to work on an expensive component like that, any help?
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