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#1
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Overfilled! Amt of fuel through return line?
I run WVO in my 84 300SD and recently set up a fuel cell in the trunk
to start & stop the car on thinner fuel. I put in a 5-9 psi fuel pump to help bring the fuel up front. I noticed my 2nd tank going down rather quickly and figured it was getting returned to the original tank. Well, tonight I noticed a fuel leak under the car and realized it was because the main tank had overfilled! I had recently topped off the main tank with WVO. My question is: how much of the fuel gets returned to the tank during normal operation? Thanks, Jeff |
#2
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This is Kitchen "Fluid Transfer"
I "Think" I remember you actually use about 1/10 of the fuel that's Pushed Through the Hard Metal Injection lines to the Injectors.
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'84 300SD sold 124.128 |
#3
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The amount depends on how good your lift pump & filters are. There is no set amount. If you have a booster pump, you will get a lot more. If you have 2 tanks & run on 1 with the return to the other you will empty one into the other. If everything is perfect, and standard, I believe compress is about right. If you want to find out how much yours is returning, disconnect the return & time it into a bottle.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#4
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How do you switch tanks?
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CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there? |
#5
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"How do you switch tanks?"
I use a solenoid I bought from Greasecar. I bought an RCI fuel cell off ebay and installed a toggle switch and fuel level gauge where the ash tray used to be. There is absolutely no change in performance when I switch between the two. Jeff |
#6
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Did you also incorporate a return to each tank, so that WVO will return to the WVO tank and diesel will return to the fuel cell?
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#7
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I have the same valves in my 240. Make sure the ground wire is attached and has good a good connection for both valves, and that they are working. You should be able to hear and feel is switch when you give it 12 volts, you might have gotten a bad valve. I once left the ground for the supply valve off when doing some work, and it filled my veggie tank when I switched to veggie because is was still pulling from the diesel tank but returning to the veggie tank.
Is it plumbed correctly? The single port on the top of the valve is where the return fuel should come into the valve, then the normally open side should be the diesel and the normally closed side should be the VO.
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#8
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if your injectors leak that much its long past time for new ones!!!
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#9
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Yes, the solenoid is working correctly.
I do not have a return line going back to the newly installed tank. I intentionally did it that way so that the WVO could be thinned out a bit by the diesel/biodiesel fuel. I just didn't know it would return so much! I live in Northern California and I don't need to run the thinner fuel for very long before I switch to the WVO. My soulution now will be to simply keep the main tank only 3/4 full when I am running both tanks. I have run WVO on a single tank for the last two years with no problems. In the past, I simply added diesel/biodiesel to the WVO in the wintertime to thin out the fuel. Jeff |
#10
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I don't think that will work. You'll pump a quarter tank of fuel in less than an hour thru the return line if my experience is any indication.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#11
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I agree you're gonna drain your diesel tank really quick. The engine is supplied with much more fuel than it needs. I've hooked up a quart ATF bottle to the supply and left the return stock and it sucked up all the ATF in just a few minutes. You either need to loop the return, which causes air issues, or put in a return line to the veg tank.
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#12
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That was my original question--how much fuel gets returned?
Seems like a fair amount. I only need to have the engine running for 5-10 min before I switch over, but there might be too much fuel getting returned for even that small amount of time. I'll see how it goes this week and if I'm losing too much fuel out of that start-up tank, I'll just plumb in a return line. Too bad though, for a second there, I'd thought I'd discovered the Eternal Fountain of Fuel!! Jeff |
#13
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Lots of people are probably thinking it, so I'll just write it. It's not worth plumbing in the extra return line because since you're running on WVO, the engine won't last long enough to make it worthwhile.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#14
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Add another return line. Or be nice to your engine and stop running WVO.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#15
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Quote:
Before converting over with a kit from GreaseKings, I took a compression test of the engine--all of the cylinders had excellent compression. Next time I take the injectors out, I'll do another compression test and this forum will be the first to get the results. I'm a complete agnostic as to whether on not the WVO will kill my IP and engine. I can only speak from my experience. I have run WVO through this car for two years and have had absolutely no problems whatsoever. It's my daily driver and I love the car. If there was a serious problem with the process you'd probably see a Sticky on this forum labeled "WVO killed my IP and engine!" instead of a WVO Biodiesel SVO Sticky. Absolutely happy WVOer, Jeff |
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