When I turn my truck off it stays running. I have removed the fss wire from the injection pump and it stays running until it shuts itself off or I shut it off with 2nd gear. I have been running wmo in it for 4 months now (130 gallons), and the fuel shut off has done this before but only continued to run on for 4-6 seconds after key off. I have verified that the fss clicks with key on and me unplugging and plugging back in the fss several times. The truck when cold also stalls hard when throttle is cut from above 1000 rpms. What could it be?

 

Definitely sounds like the internals of the IP are getting dirty - both of your issues could be contributed to that. Pull your fuel filter and empty it, then fill it to the top with a fuel additive such as Diesel Kleen, then put it back on and fire up the truck - hopefully this flushes the inside of the IP and takes care of the sticky FSS and idle governor.

 

Ill give that a try. Would a full tank of diesel run through it help too?

 

I'd do both actually - full filter of Diesel Kleen, then a full tank of diesel with Diesel Kleen in it.

 

Blending with diesel instead of straight WMO would help.

Compare the viscosity of the WMO to diesel.

As winter gets here it is only going to get worse.

 

Oh, he don't blend? Ya need a heater for that stuff man, hell I have a heater even tho I hardly ever go more than 25% WMO or ATF.

 

Ya Ive been running 100% with no heater.

 

I did the same thing with WVO for a little while, and it was fun, for a little while until my Injection pumps started going out. I pulled my third one in two weeks today(not off the same trucks). At $300 each, this is starting to get expensive.

 

Not sure what your fuel cost per gallon is there, but if I killed an IP running 130 gallons of WMO through my engine, I would have a higher operating cost per mile than I do running straight diesel at 2.89 a gallon.

130 gallons of fuel at 2.89 would be 375.70.
An IP locally is 435 dollars, plus I have to change it, so add tax and my time for labor.
Negative savings of about 130 dollars.