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Author Topic: Duel Tanks  (Read 2308 times)
captain ron
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« on: December 23, 2007, 08:55:57 PM »

I forget who but somebody on here has duel tanks on their MCI. Do these tanks have a switching system or are they tied together by being fed with a fuel line low in the tank. The reason I'm asking if they are separated by a switch then they probably have the type of valve I need for my WVO system that will have supply and return for each tank. Part #s and a place to find them would be nice also. Thanks
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Busted Knuckle
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« Reply #1 on: December 23, 2007, 08:58:37 PM »

Ron the MCI's that had the auxilery tank in the front bay did not have a switch over merely connected by hoses bottom to bottom! HTH FWIW!
Grin  BK  Grin
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Busted Knuckle aka Bryce Gaston
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captain ron
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« Reply #2 on: December 23, 2007, 09:09:07 PM »

Thanks for ruining my day  Cry
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captain ron
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« Reply #3 on: December 23, 2007, 09:10:21 PM »

Are there any duel tank buses with what I need?
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Lin
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« Reply #4 on: December 23, 2007, 11:07:32 PM »

Don't know about buses with dual tanks.  Lots of trucks seem to have them.  What system do they use?
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NewbeeMC9
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« Reply #5 on: December 24, 2007, 12:56:12 AM »

http://www.jcwhitney.com/autoparts/ItemBrowse/c-10101/s-10101/p-100000219616/mediaCode-ZX/appId-100000219616/Pr-p_CATENTRY_ID:100000219616

er go ron

they also have 3 ways if you want to use two and stage the shift
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Tony LEE
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« Reply #6 on: December 24, 2007, 02:28:36 AM »

Problem is that if it is a full dual tank system you would also have to switch over the return pipe as well as the suction pipe. Either that or use most of one tank first and then switch to the second tank with the return still going to the first tank, then back to the first tank. Get it the wrong way and you would be in big trouble for leaving a trail of diesel behind you.

Fuel injected planes have problems with management of dual tanks and more than one has gone to earth because of fuel wasted through being returned to a full tank and overflowing.
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captain ron
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« Reply #7 on: December 24, 2007, 08:32:22 AM »

John, I'm not sure if that one is big enough  for the fuel consumption of an 8V92. Good price though.
Tony, All of these valves I have seen return fuel to the tank they draw from.
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Len Silva
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« Reply #8 on: December 24, 2007, 08:38:27 AM »

You might want to consider seperate valves for supply and return so that you don't cross contaminate the tanks when switching.  You could switch the supply, then a minute or so later, switch the returns after the lines are purged.

Len
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« Reply #9 on: December 24, 2007, 09:06:19 AM »

Quote from: Charley Davidson
Thanks for ruining my day  Cry

Sorry just trying to help by telling the truth!

Quote from: Charley Davidson
Are there any duel tank buses with what I need?

Again I am sorry to admit that I don't know of any set up that way, but then again I don't know everything. Maybe one of our bus guru's such as Dallas, Russ, Tekebird, or BW will know of one! Good luck! I was gonna suggest one like the new trk we bought has, but probably is too small!
Grin  BK  Grin
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« Reply #10 on: December 24, 2007, 09:44:46 AM »

I don't know of any.

why don't you just contact Golden Fuel Systems in MO.  Owner is a member of the board and this is what he does for a living.

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kd5kfl
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« Reply #11 on: December 24, 2007, 09:52:59 AM »

According to a retired fireman I once knew, the single most common cause of vehicle fires is homebrewed tank switching systems. I would assume that this is fostly gasoline vehicles.

Second most common cause: selling it to the insurance company.

Honorable mention: Pressed in brass fuel fitting on hot Solex carbs pops out, spraying gas on hot VW engines. Which is why a VW burning on an uphill mountain road was once a not uncommon sight.

Almost never: vehicle catches fire after acident, so common in movies and TV.
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sivrtnge2
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« Reply #12 on: December 24, 2007, 10:08:40 AM »

I can get you the information you need. However, to make it work, you will need the exact same length lines and the exact same size. The system is known as a duel feed dual return system with 2 valves. I just bought the parts to correct a problem with my truck so I am speaking from hands on experience. Also, If you are running the lines in different directions, they will have to be the exact same elevation or it will throw off the system. When running your lines, try not to have any loops, long sags, or high humps in the lines which again will through off your system. Once again I will get you some parts numbers by Wednesday.
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« Reply #13 on: December 24, 2007, 01:26:19 PM »

Any number of ways it could be done.  What I am planning is running two separate fuel tanks, each with a dedicated feed/return electric fuel pump.  Obviously this will entail feed and return lines of the proper diameter, along with the employed pump(s) wired thru the engine oil pressure sensor/relay.  Might also run about a one gallon accumulator tank.  Not sure.  The extra pressure gages would also be nice.

Many people have done this employing just one fuel level gage with a simple two position switch switching both the tank, pump and gage.  Since I am kinda feeble minded, my plan is to make the system as idiot proof (me!) as possible employing two separate complete systems along with that important, dedicated, protected tank switching switch.

Yeah, Dad's old Cessna had a complicated system where it was quite possible to overfill a already full tank, run out of gas, then bleed profusely, then burn completely.  You had to be very careful with your fuel management, since it balanced out the aircraft and stuff.  I want to make my coach much more simple.  Also for what it is worth, the planned gen set may be able to suck from either tank.  Smiley Smiley Smiley
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niles500
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« Reply #14 on: December 24, 2007, 01:36:49 PM »

Anderson or Pollack make the valves (6 way) - HTH
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- Niles
captain ron
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« Reply #15 on: December 24, 2007, 02:01:43 PM »

Bill, Sounds like your system is just too feeble or unreliable. I want something that will work regardless of installation.
I think Golden Fuel has a high flow one but not sure if it's big enough for the demands of a thirsty Detroit. If I could find something that was used on a semi duel tank system then I would feel better about it.
Niles thanks for the lead I'll check it out.
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niles500
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« Reply #16 on: December 24, 2007, 02:13:08 PM »

Try these:


http://cgi.ebay.com/ebaymotors/Pollak-Fuel-Tank-Valve-Selector-SVO-TDI-WVO-Biodiesel-6_W0QQcmdZViewItemQQcategoryZ33556QQihZ019QQitemZ290192440480QQrdZ1QQsspagenameZWDVW

http://cgi.ebay.com/ebaymotors/FUEL-TANK-VALVE-SELECTOR-SVO-TDI-WVO-BIODIESEL-DIESEL_W0QQcmdZViewItemQQcategoryZ33556QQihZ010QQitemZ200185476804QQrdZ1QQsspagenameZWDVW

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« Reply #17 on: December 24, 2007, 04:11:21 PM »

Hey Charlie,
I just gave you the information that is on a 2001 KW900L. It is specs from the manufacturer. Nothing is needed as for as I know, other than the fuel pump for pumping fuel and the splitter valve for equalizing the fuel to the tanks. Any truck system will be the same if it is a "dual feed dual return system" The govt. banned the cross over lines at the bottom of the truck in the late 80s or early 90s.

As for as the lines are concerned, with this type of system, common sense would tell you that if the lines are not ran exactly the same. One tank is going to out fill the other. I had a line collapse on me so I replaced them both and was told I could do it myself. Just make sure you run one line the same way you run the other!!!
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BILL
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captain ron
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« Reply #18 on: December 24, 2007, 04:27:18 PM »

Bill, I'm not sure but I think we're on different wave lengths here. I think the system you are talking about draws fuel from both tanks at the same time keeping them equal. The usage I need is to draw from and return to different tanks holding different fuels and returning the proper fuel to the proper tank. Correct me if I'm wrong
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sivrtnge2
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« Reply #19 on: December 24, 2007, 08:12:39 PM »

Hey Charley,
You are probably right. (YOU DID SAY YOU WERE LOOKING FOR THE KIND ON SEMIS...RIGHT Huh) All I know is I've been into trucking for 15 years now...and all I have seen is the fuel system with the crossover line at the bottom. The govt banned that system on trucks built after a certain date (I think the late 80s or early 90s). They went to the "dual feed dual return" system which is simply the fuel pump pumping fuel up to a tee valve from both tanks...going through the filter system to the engine and then returning it to an "equalizing splitter valve" and back to the tank. I do know that on some Freightliners and Peterbilts (I think), they have a couple of handles underneath the driver side door that are used to close a valve in the line. One go to the passenger side, the other for the driver side tank.

I looked at the Item mentioned on Ebay, If they used those on semis...I have never s Shocked n one  Grin!!!
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BILL
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captain ron
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« Reply #20 on: December 24, 2007, 08:31:20 PM »

Bill at first I thought that semi's switched from one tank to the other but I see I was wrong. The item that Niles linked to on E-Bay is the type of valve I need but not sure if it will flow enough fuel.
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sivrtnge2
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« Reply #21 on: December 24, 2007, 08:51:01 PM »

I can check the psi of a Detroit...what engine are you talkins about??? One of the guys was saying something about a1 gallon accumulator tank. I would think that at 60psi. It should be sufficient. It did read high volume!!!
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BILL
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captain ron
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« Reply #22 on: December 24, 2007, 09:10:12 PM »

I have a 8V92 DDEC  I'm not using an acumulator tank it's not needed. The fuel pump will do its job.
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JackConrad
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« Reply #23 on: December 25, 2007, 04:24:30 AM »

Our 8V71 carries about 65-70 PSI at cruise RPM. About 15-20 at idle (per electric fuel pressure gauge  in dash & confirmed by mechanical fuel presure gauge in engine compartment).  Jack
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« Reply #24 on: December 25, 2007, 08:21:35 PM »

One thing to remember is that if you do switch over to an empty tank, you are then going to have to re-prime the engine. Difficult enough in a simple system but maybe even more of a problem with a dual system.
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« Reply #25 on: December 26, 2007, 04:51:06 AM »

Charley go to wrecking yard and get it off a Ford Diesel pickup it's mounted on frame under drivers position and get dash switch also it's what you need

LarryH
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