Biofuel blend, runs a while, stops, rests then starts again.

[dubl_t]

Well JOAT1980, I can't vouch for the CPS as I don't have enough experience with the 7.3. But it does sound like it could be a lift pump/filter issue as I've experienced that 1st hand.
Regarding the blended wvo, I and several associates have seen that 1st hand as well, and it works fine. In my experience running blend in my Cummins, up to 370K miles, saved me ALOT of $$, oh yea, helped the environment as well
dse in truck 04-05 CTD - TDR Roundtable

It's a long thread, but get through the whole thing. I think Craig has over a couple hundred miles on blend as well. Tom.

[jackofalltrades1980]

So far I did replace the CPS, the truck started up just fine on the biofuel that was in the tank and ran for over an hour without any problem. Of course that doesnt totally mean anything, Ill have to drive the thing around a little bit to see how it acts, well mainly drive around near the house so in case the thing does crap out again I'll be close to the house. More to come...

[95and05]

Originally Posted by jackofalltrades1980

So far I did replace the CPS, the truck started up just fine on the biofuel that was in the tank and ran for over an hour without any problem. Of course that doesnt totally mean anything, Ill have to drive the thing around a little bit to see how it acts, well mainly drive around near the house so in case the thing does crap out again I'll be close to the house. More to come...

sounds good so far keep us posted!

[jackofalltrades1980]

Well so far after replacing the CPS, the truck has been running fine. It would start up just fine, on cold days Id have to use the glow plugs, normal, but otherwise, the oil blends proved to not cause problems. So far Ive gone 7 days on just the oil blend, going to and from the city to the job or to do other things on the weekend, 30+ miles one way, all highway driving. Im theorizing that the high RPM running is probably doing the engine good on the oil blend since the fuel is moving through pretty fast and nothing is allowed to build up through the periods that the engine is idling. Ive been doing both of the blends, the 50/50 WVO/diesel and the 80/20 WVO/gasoline, with no ill effects. Starts and runs the same no matter what. Even when the temps drop down into the low 40s the engine still ran just fine, even at 70mph. So, it appears that the gremlin called coincidence did rear its ugly head during my WVO exploits. More to come as time progresses....

[Clay Henry]

Don't expect a failure from this practice of fuel blending to happen imediately...but expect it sooner or later.
It may work fine for 20, 30 40k miles but i wouldn't expect much more than that really.

[Clay Henry]

And the Polymerization that occures when vegi comes in contact with the steel tank will begin to form immediately causing filter clogges. Might monitor your filters.

[agman365]

As a reply to all of the above. We ahve used B99 for 3 years now in many brands of engines, and have worked with engine manufacturers in sharing results. We use app. 25-30,000 gal. of Bio per year. In the winter in over the road trucks in Colorado we have run B50 without any problems whatsoever. As some realize there can be a huge difference between Bio and WVO, and SVO. I would not run much WVO or SVO in the newer Teir III emission engines w/o extensive lab work. In older (mechanical Injection) engines you are fine if the purity issues are addressed properly. Bio is the same as diesel in that poor quality causes problems. The main reason that WVO or SVO will gell at higher temps., is that it contains glycerin, which has a much higher cloud point. Commercial bio has the glycerin removed through a chemical process. If you want to try this to see there is much info. on it but you use lye and methanol to seperate the glycerin from the SVO. Work now is being done to leave the glycerin in the bio, as it is energy. Our testing, and of others familiar with this show app. 6% decrease in B100 vs. #2 ULSD, and a 4% increase from bio SVO over #2 ULSD. When you mix the unleaded you are mixing at levels (80-20) which also has worked well. The unleaded serves only to bring the viscosity to levels matching #2 diesel. The glycerin is still in the VO. In years past with mechanical injected engines, common practice in the trucking industry was to add unleaded to the fuel to lower the cloud point. You must be careful to keep that level to where pre-ignition and "drying" of the fuel did not cause lubricity problems. Today, I would be cautious of this practice in a Teir III engine due to split injection cycles, higher temps etc.. ULSD is severly lacking in lubricity, hence changes in additive packages, oil recomendations, etc. Hence one of the reasons that bio, done correctly is a good fit with most new engines. CNH just announced FULL engine warranty with B100. Others we have tested with will announce when all testing is finalized.
CAUTION: Remember, WVO, and SVO are NOT the same as lab verified B100, so BE SURE of what you are using. FILTRATION is critical. Many hear of horror stories, often involving WVO-SVO and do not recognize why there can be a difference. Good Luck

[agman365]

We have seen NO issue in new tanks, but Bio in older systems will clean deposits from those systems, hence the filter issues. All of our bulk tanks are steel, from 5,000 gal. to 18,000 gal. Also be aware that bio held over winter when there may be more condensation needs treated to avoid algae growth. This can apply to diesel also, but is less prevalent. Lastly, bio does affect many older fuel hose type apparatus over time....

[chazburton]

If your truck has run diesel since 1995, your problem is more than likely all the diesel build up in the tank over the years.
Because bio mixed with gas is a solvent, you have cleaned you fuel system now and it is plugging your filters and injectors.
The best way to correct this is to drain the tank and start over blending small amounts of wvo with large amounts of diesel until your diesel build up is cleaned out.
You may end up changing your filters allot at first, but I can tell you that wvo and bio fuels work.
I ran the stuff at 100% for 30,000 miles with no trouble at all.
The only difference was I had a new truck that did not get the diesel build up in the fuel system.
Mixing gas is not really a gas idea , you should process your wvo, wash and filter it to remove soaps to avoid fuel system problems.

Hope this helps .

[jackofalltrades1980]

Since Ive been hearing a lot about polymerization, I was wondering about the normal WVO/SVO operation that most people do with the heating of the oil in the tank and filters before the oil hits the injection system. If polymerization happens to oil when it gets hot, I was wondering if thats pretty much inevitable even with standard SVO systems, since the oil is getting heated to approx 200 degrees, then when it hits the injection system and gets pressurized (which raises temps itself). Along with the recycling of unused fuel oil in most normal FI systems, youre getting this hot oil being returned to the tank to be used again, so again, Ive been figuring that this polymerization event was pretty much a given even on regular SVO systems. Then theres also the idea that ALL WVO that us greasers collect has already undergone superheating (up to 350 degrees), so I would figure polymerization would definately be a given on WVO. The way I looked at it, any thick oil that was formed through any heating, either before or after hitting the fuel tank, would be caught by the filters in the vehicles fuel system before it hits any sensitive areas. This also applies to the glycerin that is present in the oil too. Any extra information to help me form a better conclusion on the whole WVO/SVO controversy would be helpful.