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how much diesel is pumped during purge?

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  • how much diesel is pumped during purge?

    I was just running through some rough numbers, trying to figure out how much diesel I'm using, mainly out of boredom, and wondered how much diesel is purged when the V3 does the shutdown purge? Assuming it's right at 10 seconds, and the stock pump is around what, 100gph (wild ass guess), with minimal restriction in the system is it dumping .28 gallons back into the WVO line/tank? (100gph / 3600 seconds per hour * 10 second purge)

    I've been doing multiple short trips and as a result am using quite a bit of diesel, just curious how much of it is going back into the WVO tank because of the purge compared to how much I'm using during startup.
    -Drew
    V3'd 2000 Excursion - gone but not forgotten
    2014 6.7L - smells nice

  • #2
    Not sure how to calculate that but on my 8 second purge, i would guess less than 3 oz of diesel returns to the VO tank on purge. The start up and drive on diesel when cold is where all your diesel goes.

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    • #3
      Originally posted by fiveohpatrol View Post
      I was just running through some rough numbers, trying to figure out how much diesel I'm using, mainly out of boredom, and wondered how much diesel is purged when the V3 does the shutdown purge? Assuming it's right at 10 seconds, and the stock pump is around what, 100gph (wild ass guess), with minimal restriction in the system is it dumping .28 gallons back into the WVO line/tank? (100gph / 3600 seconds per hour * 10 second purge)

      I've been doing multiple short trips and as a result am using quite a bit of diesel, just curious how much of it is going back into the WVO tank because of the purge compared to how much I'm using during startup.
      Drew,

      I have removed the return line to my veg tank and found that each second of purge moves very close to one ounce of diesel through the system towards the veg tank.

      After a purge of nine seconds, diesel starts to show up at my tank (actually seems to be a mixture of diesel and veg at that point). Each second after that puts very close to one ounce additional diesel into the tank. These results are for an extended cab truck with hoses entering at front right corner of bed and joining the tank halfway across the bed (additional or less hose length would change those figures a bit). Running a 2000 7.3. - Patrick

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      • #4
        Thanks for the info Patrick. So since it is pumping 10oz of diesel into the line/tank, it would take 12.8 shutdowns per gallon of diesel.

        Assuming it takes me 4 miles (when it's this freakin cold outside), and I'm guessing 12mpg at best during warmup, there's a third of a gallon. Like Clay mentioned, the majority of the diesel is being used here. But there is still a decent amount being used to purge.

        Originally posted by lancaster,pa View Post
        Drew,

        I have removed the return line to my veg tank and found that each second of purge moves very close to one ounce of diesel through the system towards the veg tank.

        After a purge of nine seconds, diesel starts to show up at my tank (actually seems to be a mixture of diesel and veg at that point). Each second after that puts very close to one ounce additional diesel into the tank. These results are for an extended cab truck with hoses entering at front right corner of bed and joining the tank halfway across the bed (additional or less hose length would change those figures a bit). Running a 2000 7.3. - Patrick
        -Drew
        V3'd 2000 Excursion - gone but not forgotten
        2014 6.7L - smells nice

        Comment


        • #5
          Originally posted by fiveohpatrol View Post
          Thanks for the info Patrick. So since it is pumping 10oz of diesel into the line/tank, it would take 12.8 shutdowns per gallon of diesel.

          Assuming it takes me 4 miles (when it's this freakin cold outside), and I'm guessing 12mpg at best during warmup, there's a third of a gallon. Like Clay mentioned, the majority of the diesel is being used here. But there is still a decent amount being used to purge.
          actually whats put in your lines durring purge is being burned on the following start up. Not much goin ginto the tank. Thats why i do not purge 10 seconds. 8 is enough.

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          • #6
            Originally posted by fiveohpatrol View Post
            Assuming it takes me 4 miles (when it's this freakin cold outside)
            Use your block heater!!!

            It was 30* this morning and the BH was on for 4 hours, warmed up for about 18 minutes on high idle and it turned on in a little over a mile and a half.

            Like Clay said... it is all burned up in the end.
            Vegistrokin since 08/23/08

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            • #7
              Originally posted by Jack_Toepfer View Post
              Use your block heater!!!

              .
              I do in the mornings, on top of already being in the garage

              BUT, when it sits outside at work for 9-10hrs, it's pretty cold when it's time to go home. I wonder if they'd mind a bright orange extension cord running 200ft up to the building?:chuckles:
              -Drew
              V3'd 2000 Excursion - gone but not forgotten
              2014 6.7L - smells nice

              Comment


              • #8
                Originally posted by Jack_Toepfer View Post
                Use your block heater!!!

                It was 30* this morning and the BH was on for 4 hours, warmed up for about 18 minutes on high idle and it turned on in a little over a mile and a half.

                Like Clay said... it is all burned up in the end.
                Why do you let it run that long before driving it? i warm mine 1 minute to allow oil to begin flowing up top and drive it real easy like for the first mile. It warms up way faster with a load on it.

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                • #9
                  Originally posted by fiveohpatrol View Post
                  Thanks for the info Patrick. So since it is pumping 10oz of diesel into the line/tank, it would take 12.8 shutdowns per gallon of diesel.

                  Assuming it takes me 4 miles (when it's this freakin cold outside), and I'm guessing 12mpg at best during warmup, there's a third of a gallon. Like Clay mentioned, the majority of the diesel is being used here. But there is still a decent amount being used to purge.
                  Drew,
                  Ya got me thinkin: The V3, like any system, really shines the greater the distance you drive after start-up. Fire-up and drive for 100 miles and you are probably getting close to 300 miles to a gallon of diesel (not too hard to take). Orange seems like a good pick for the 200 foot extension cord. http://www.dinofuelalternatives.com/...lies/smile.gif - Patrick

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                  • #10
                    I get a CEL if I'm on the throttle too early. It warms up faster when I'm moving... but with my combination the interior is warm, the ice is melted and the temp gauge is on the line above C.

                    My truck doesn't like to move until it is warm.

                    As far as I'm concerned... until the fuel crisis... everyone idled their diesels. Now everyone is worried about wet stacking and wasting fuel... and I just don't think it is that big of a problem, especially since it is on diesel anyway.
                    Vegistrokin since 08/23/08

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                    • #11
                      Originally posted by Jack_Toepfer View Post
                      As far as I'm concerned... until the fuel crisis... everyone idled their diesels. Now everyone is worried about wet stacking and wasting fuel... and I just don't think it is that big of a problem, especially since it is on diesel anyway.
                      I've seen this term a few times now. Someone wanna fill me in on what wet stacking is supposed to mean.

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                      • #12
                        Originally posted by VTVegiPower View Post
                        I've seen this term a few times now. Someone wanna fill me in on what wet stacking is supposed to mean.
                        An accumulation of unburnt diesel fuel in the cyl. from extended cold weather idling. Some say after a while on some engines you will actually see fuel dripping from the tail pipe.
                        I do not by into this theory with todays diesels.

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                        • #13
                          Originally posted by CHenry View Post
                          actually whats put in your lines durring purge is being burned on the following start up. Not much goin ginto the tank. Thats why i do not purge 10 seconds. 8 is enough.
                          That's a good point, and I never thought about it like that. I was just concerned with seeing clean diesel during a purge. I think I will turn my purge time down a bit. :cheers:

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                          • #14
                            Originally posted by CHenry View Post
                            An accumulation of unburnt diesel fuel in the cyl. from extended cold weather idling. Some say after a while on some engines you will actually see fuel dripping from the tail pipe.
                            I do not by into this theory with todays diesels.
                            I agree Clay. And for that matter... it is the end of 2008... if I can't idle a work truck for 20 minutes without hurting something... we got problems

                            I'll check the tailpipe tomorrow morning to see if there is any dripping... it only idled for about 10 minutes today.
                            Vegistrokin since 08/23/08

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                            • #15
                              There is approximately 3 ounces of capacity in the fuel rails so if you have a V2 system you will want 8 seconds of purge time to get at least 6-8 ounces past the manifold. If you have the V3 you will want 10 seconds of purge time due to the fact that the V3 purges just a couple seconds slower. You should be getting about 6 ounces past the manifold to the tank. Remember that the main 3/8 feed line needs to refill with diesel so to ensure it doesn't gel up preventing fuel from making it to the motor.

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