What is the typical flow rate of the Powerstroke fuel pump? I can figure the fuel consumption, but the pump puts out more than the engine uses. Some is returned to the tank.
My thinking is that when we switch back over to diesel, the fuel pump is pushing more through the filter housing than the engine is using, therefore instead of it taking 15 minutes to switch over, it may take less.
I find the veggie smell lingers a while longer than what it should be from the switchover of fuels. So, I don't want to trust just my nose to know when the fuel has been swapped.
Todd
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2002 F-250 Lariat, PSD, CC, short bed, 3.73, auto tranny, Line-X bed liner, AFE Filter, HX crossover, intake heater delete, Evans NGC+, Dieselsite 203 thermostat, coolant filter, Amsoil by-pass filter, Schaeffer's synthetic blend tranny fluid, Bob Riley's tranny filter, Velvet Ride shackles, Rancho 9000 shocks with in-cab adjustment, 60 gallon aux tank for burning heated WVO, burning veggie since fall of '04.
I asked this over in the 7.3 engine forum and got some feedback... our pumps put out roughtly 30 gallons per hour or half a gallon per minute. Whatever isn't burned is returned to the fuel tank.
I measured the stock filter element and added a little for the overall filter housing and the fuel lines.... right about 32 ounces, or a quart.
Based on this, it should only take half a minute to swap fuels. However, the diesel is thinner and cuts through the veggie quicker. This means we will still have some residual veggie in the system for a while longer.
So, short of sniffing the exhaust pipe, any ideas on how long to purge considering the fuel is returned to the tank?
Todd T
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2002 F-250 Lariat, PSD, CC, short bed, 3.73, auto tranny, Line-X bed liner, AFE Filter, HX crossover, intake heater delete, Evans NGC+, Dieselsite 203 thermostat, coolant filter, Amsoil by-pass filter, Schaeffer's synthetic blend tranny fluid, Bob Riley's tranny filter, Velvet Ride shackles, Rancho 9000 shocks with in-cab adjustment, 60 gallon aux tank for burning heated WVO, burning veggie since fall of '04.
According to Frybrid it takes 6 times as long to wash it out; here's a snippet:
In addition because it was a closed system and diesel could only be introduced as the vegetable oil in the system was consumed, this volume of fuel was only slowly being diluted with the incoming diesel so that the entire volume of fuel not only needed to be consumed once, but 6 times to insure that no vegetable oil was present, this led to very long purge times and a proclivity to trap air in the fuel system resulting in fuel system failure. Some systems went as far as to simply permanently "Loop" both the diesel and the vegetable oil which is a particularly poor idea as diesel is a poor lubricant to begin with and when heated becomes a destructive force in the fuel system, this is why most diesel engine actually have a fuel cooler in the return line.
I closed my return line on the veggie side on my pickup; I've been driving about 3-4 miles when I purge and haven't seen a problem utilizing the stock fuel bowl. Keep in mind I'm also in the frozen tundra of S.E. Michigan where the temps can get cool.
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2005 Excursion Limited; build date 09/04. MBRP T-304 Turbo Back Exhaust. Sickening monthly payment.
I can see the need for extended purging time due to the mixing of veggie and diesel. So, multiply the 30 second purge times six... three minutes of idling. If coming off highway speeds, this isn't a bad idea for cooling of the turbo anyway.
This is still a lot less expensive than going to a dual fuel system plan like the Veggiestroke.
Todd T
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2002 F-250 Lariat, PSD, CC, short bed, 3.73, auto tranny, Line-X bed liner, AFE Filter, HX crossover, intake heater delete, Evans NGC+, Dieselsite 203 thermostat, coolant filter, Amsoil by-pass filter, Schaeffer's synthetic blend tranny fluid, Bob Riley's tranny filter, Velvet Ride shackles, Rancho 9000 shocks with in-cab adjustment, 60 gallon aux tank for burning heated WVO, burning veggie since fall of '04.
I'll agree. I do like the automated benefits, quicker purge times, fail safe operations, but for what it cost me to build it myself using very easy to obtain parts... I think I'll just flip the switch when the truck comes to temperature, and wait a few more minutes on shutdown; keeping things simple.
Now a turbo timer, that would be golden.
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2005 Excursion Limited; build date 09/04. MBRP T-304 Turbo Back Exhaust. Sickening monthly payment.
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