VE 12V starting

BeerKiller

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Hello all,

This seems to be a common topic lately however I didnt want to muddy anyone else's thread. I am having to give a little pedal when starting my 92 Cummins truck and I wanted to know what are your thoughts as to why. When I try and start it without giving it any pedal it will start but it seems to be running very low RPM and wants to die. I believe the previous owner disconnected the grid heater so I am sure that might help, but it will do it even when its 60*F outside. I am not 100% certain my mix but its close to 80/20 oil/gas mixed 50/50 with diesel.

How much will getting the grid heater help?
Is the oil too thick? its pretty thin IMO compared to what we run in my fathers 98 Cummins
Is raising the idle common practice with WMO?
Do I need to plug in the block heater?

Thank you for any feedback
 

SultanofNACL

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My experience with running any alt fuels is limited to mechanical diesel engines with a DB-2 injection pump, haha.
Though running WMO should generally be the same between Ford/International and Dodge engines but the particulars are down to the injection pumps themselves.
Jesus Freak has an extensive thread on running 6.9/7.3 International IDIs on WMO: 6.9 & 7.3 IH IDI on WMO
Injection pump advance or retard?: https://www.dieseltruckresource.com/forums/1st-gen-ram-all-topics-93/advanced-timing-wmo-245993/

Could your injectors or injection pump be getting tired and not able to keep up with what the engine needs?
 

Jesus Freak

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I don't know the Cummins too well, @u2slow and @Mt_Man will be the guys for that. But if you mix gas and oil and then do diesel like you say that should be more than thin enough, honestly I wouldn't worry about putting gas in if you just do oil and diesel 50/50.

But from a Ford IDI point of view, I'd say it's a slightly clogged fuel filter.

And the sultan might be on to something about the IP, but see if a filter helps.
 
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BeerKiller

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My experience with running any alt fuels is limited to mechanical diesel engines with a DB-2 injection pump, haha.
Though running WMO should generally be the same between Ford/International and Dodge engines but the particulars are down to the injection pumps themselves.
Jesus Freak has an extensive thread on running 6.9/7.3 International IDIs on WMO: 6.9 & 7.3 IH IDI on WMO
Injection pump advance or retard?: https://www.dieseltruckresource.com/forums/1st-gen-ram-all-topics-93/advanced-timing-wmo-245993/

Could your injectors or injection pump be getting tired and not able to keep up with what the engine needs?
I will read up on that IDI thread. I dont believe the timing has been messed with but I will double check. The truck does have 300K so the pump and injectors could be tired.
I don't know the Cummins too well, @u2slow and @Mt_Man will be the guys for that. But if you mix gas and oil and then do diesel like you say that should be more than thin enough, honestly I wouldn't worry about putting gas in if you just do oil and diesel 50/50.

But from a Ford IDI point of view, I'd say it's a slightly clogged fuel filter.

And the sultan might be on to something about the IP, but see if a filter helps.
Thank you for the reply. I just installed a sump and a 10" 5 micron filter with 1/2" lines and a new lift pump. I ran the system on Diesel for about 100 mi before adding WMO so I dont think it is the lines or filters but I wont rule anything out.
 

Jesus Freak

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I will read up on that IDI thread. I dont believe the timing has been messed with but I will double check. The truck does have 300K so the pump and injectors could be tired.

Thank you for the reply. I just installed a sump and a 10" 5 micron filter with 1/2" lines and a new lift pump. I ran the system on Diesel for about 100 mi before adding WMO so I dont think it is the lines or filters but I wont rule anything out.
Stuff happens, with a new pump and more flow it coulda sucked up some crud in the tank, or a bad batch of WMO. But 300K on an IP and your asking it to drink some pretty strong coffee, early in the morning when it's cold.
 

BeerKiller

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Stuff happens, with a new pump and more flow it coulda sucked up some crud in the tank, or a bad batch of WMO. But 300K on an IP and your asking it to drink some pretty strong coffee, early in the morning when it's cold.
Yea I agree. I think I might read up on what the WVO guys are doing to heat the fuel lines. Once the truck is half way up to temp it seems to idle just fine so I am thinking if I thin the WMO it should help a bunch.
 

u2slow

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@BeerKiller your mix seems heavy to me, so far as it only being 50% diesel. I have gone that far, but only with relatively thin/clean hyd oil; in the summer. I have never blended with gasoline, so I don't know the result there.

Most Cummins trucks have a label on the sunvisor saying part throttle is required for colder temp starts. Since you have disconnected the grids, it's like it's colder all the the time.
 

Jesus Freak

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@BeerKiller your mix seems heavy to me, so far as it only being 50% diesel. I have gone that far, but only with relatively thin/clean hyd oil; in the summer. I have never blended with gasoline, so I don't know the result there.

Most Cummins trucks have a label on the sunvisor saying part throttle is required for colder temp starts. Since you have disconnected the grids, it's like it's colder all the the time.
I knew you were the man for the job. Is 50/50 really "heavy" for the 12v? If so, it's Its because you have a single tank system, correct? If your Dodges had a 2 tank system, would you be able to run it heavier if you cranked up on diesel?
 

Jesus Freak

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There's some neat ideas about heating fuel lines. Mostly manipulating the heater hoses, please keep us informed and post pictures. Maybe even start a thread with "wmo" and "12v Cummins" in the title so posterity can find it easy.
 

u2slow

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I knew you were the man for the job. Is 50/50 really "heavy" for the 12v? If so, it's Its because you have a single tank system, correct? If your Dodges had a 2 tank system, would you be able to run it heavier if you cranked up on diesel?

I have a single tank, and not going to blend any higher.

I prefer injectors with fewer and larger holes. Coking can be a issue with direct-injection, and I'm predicting the larger holes won't foul as easily.
 

BeerKiller

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50/50 shouldnt be too heavy IMO. My fathers 98 12V runs 90% - 100% WMO but he also has the P pump which I am convinced will pump axle grease.

I should note that he also has similar symptoms as me and he just upped the idle about 100rpm. Seems to work just fine until he puts straight diesel in her and it seems to idle pretty high (1000ish rpm)
 
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