88 6.2 diesel, switched to veg, new injection pump dead?

For discussing the modifications needed for diesel vehicles to run with 2 tank veggie oil conversions.

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88 6.2 diesel, switched to veg, new injection pump dead?

Postby weldingwingnut » Mon Mar 12, 2012 12:52 pm

I picked up an old 88 burban with 488k on her was running pretty good no smoke decent power. In the summer i accidentally forgot to switch to diesel before changing filters guess let a bunch of air in lines and ran ok for the rest of the day but at night oil settled in the lines and starting on diesel was fine untill got to temp switched over then long line of air killed the i.p.. After a new rebuilt i.p, starter glowplugs i ran her on diesel for a while noticed even more power then before idled way nicer and generally put some new life into her. Recently i got her back and runing on veg for a few weeks but it was way too cold at the time to switch over , i missjudged the engine temps and shortly after heard a single pop sound from the middle of the engine. Could it be the oil was too thick and stalled the engine cauing a backfire, or blown the injection pump? I just dont know if it really is that easy to kill a fresh rebuilt stanadyne i know they arent ideal for veg conversions. So i have ordered a seal kit for the pump regardless and try to rebuild my original i.p or the new one. At the time of catastrophic failure i cracked the first 4 injectors and cranked her to see if any fluid was at least passing through.... nothing.. I guess im just looking for any insight probably looking to rebuild the pump and probably get rid of her go cummins or something japanese.
1988 6.2 suburban 4x4
1986 350 suburban converted shotbox crew cab
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Re: 88 6.2 diesel, switched to veg, new injection pump dead?

Postby SunWizard » Mon Mar 12, 2012 1:54 pm

Probably snapped the shaft, that is very common with that IP. The best idea I have heard for running those weak ones is to put a FPHE just before the IP and heat both diesel and WVO. This gets the IP warm before switchover.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
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Re: 88 6.2 diesel, switched to veg, new injection pump dead?

Postby weldingwingnut » Mon Mar 12, 2012 9:30 pm

Dang i see. I do have a 40 plate heat exchanger just before ip behind to the right of the air filter cap and before that have a coolant coil which the 10 micron veg filter sits in. After it poped i touched the HE and coolant coil and it was still warm not raging hot like im used to. So the shaft may have snaped hey? i think iv sourced a i.p. part supplier in texas, i suppose ill take the pump apart and check the parts out.
1988 6.2 suburban 4x4
1986 350 suburban converted shotbox crew cab
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Re: 88 6.2 diesel, switched to veg, new injection pump dead?

Postby weldingwingnut » Tue Mar 13, 2012 4:59 pm

Also i forgot to add, i have the veggie loop system so its just one line from the veg tank to the valve to lift pump and returns back into a loop, would the back pressure of the returning fuel put extra stress on the i.p.?
1988 6.2 suburban 4x4
1986 350 suburban converted shotbox crew cab
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Re: 88 6.2 diesel, switched to veg, new injection pump dead?

Postby SunWizard » Tue Mar 13, 2012 5:09 pm

weldingwingnut wrote:Also i forgot to add, i have the veggie loop system so its just one line from the veg tank to the valve to lift pump and returns back into a loop, would the back pressure of the returning fuel put extra stress on the i.p.?

No. But it makes a purge take far longer.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
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Re: 88 6.2 diesel, switched to veg, new injection pump dead?

Postby weldingwingnut » Thu Mar 22, 2012 5:19 pm

Cool thanks for the info, i took it apart yup shaft is snaped
1988 6.2 suburban 4x4
1986 350 suburban converted shotbox crew cab
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Re: 88 6.2 diesel, switched to veg, new injection pump dead?

Postby DirtyBarrel » Sat Apr 21, 2012 9:52 pm

How long do you expect to be able to run your new standadyne ip on veg? i just replaced the ip + a fuel injector on my 6.5 (115k miles) after driving about 14,000 miles on wvo. Is heat shock the best way to kill the ip and injectors? or does the veg just wear on the stanadyne that fast?

Dont let this get you down! I def recommend putting a mechanical temp guage right after your FPHE so you know exactly what temp it is at. The only problem is that you end up staring your gauges all the time : /
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Re: 88 6.2 diesel, switched to veg, new injection pump dead?

Postby SunWizard » Mon Apr 23, 2012 3:01 pm

DirtyBarrel wrote:Is heat shock the best way to kill the ip and injectors? or does the veg just wear on the stanadyne that fast?

WVO doesn't wear the IP, it has much better lubricity than diesel. Suspended water in your WVO is probably the best way to kill it. Heat shock is probably #2, and its problem is more that when the IP is cold, it cools WVO making it thick, and thick WVO is what causes a snapped shaft.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
SunWizard
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Re: 88 6.2 diesel, switched to veg, new injection pump dead?

Postby MikeGoodman59 » Mon May 14, 2012 7:06 pm

A friend has a 1998 Suburban ... 60,000 miles, I'd say. Moved the electronics away from the "V" and put a heat sink on the electronic controller. There's a kit for that, but I don't know what it is.
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