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Old 10-02-2014, 07:39 AM   #1
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Default Kenworth T2000 with Dual tanks and no cross over tube, need to connect generator

im building a Kenworth Show hauler and have to hook up the 12500kw generator, like the truck its Diesel but what im a little confused on is this. i have dual tanks and no switch it pulls from the top of both tanks, on the top of each tank there is both a feed and return. there is no tube on the bottom of the tank to equalize the tanks. so my question is what happens if you were to run one tank out. or the real question if i pull fuel from one tank for the Generator how will the system know one tank is lower and could even empty ? the two feed and return lines seem to go to a distribution box in the middle of the frame and leave in one line to the Engine ?

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Old 10-02-2014, 02:01 PM   #2
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Im following this closely (for selfish reasons).

My gen pulls from the passenger side tank (not certain if/where the generator return goes, but now ill look).

On the drivers side (on top of the tanks) I have two levers which "shut off" (engine?) fuel from each tank.

Ive noticed some UNEVEN consumption when driving (long distances between fuel stops).
when driven more than 700 miles between re-fueling one tank (i don't recall which) will only have 5 gallons or so remaining, while the other tank will have 20 gallons remaining.
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Old 10-02-2014, 02:34 PM   #3
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what i was told is the tanks leave and go into a pump, there is one they lead to in the middles of the frame and then go forward with single feed and return. Its supposed to transfer from one side to the other by this pump but im kinda old school and used to a hose between them. mine has no valves and only one gas gauge so it must equalize some how. just looking for a little insight
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Old 10-13-2014, 07:17 AM   #4
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Any updates on this? I have the same truck and want to go down to one tank. Not sure how that will work. Can you block off one set of lines?
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Old 10-13-2014, 08:54 AM   #5
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I Actually found out that there is a pump that the lines on the top of the tank go to, when the truck idles this pump will equalize the fuel in the tanks with in 10% of of each, i took the truck to the station put more in one tank and took a ride for a bit and then let it run for 15 minutes after i got back, both tanks were about the same (had allot more in the pass side) im going to just run a bulkhead style fitting like they use in Fuel cell's for a race car on the top back of the tank, running a tube inside the feed to about 12" off the bottom on the drivers tank for both the feed and return.

i would ask more about using one tank but im guessing running the lines direct from the output of the tank and bypassing the pump would do it, just not sure about the flow.
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Old 10-13-2014, 10:30 AM   #6
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Thanks for the response and info! Very cool idea with putting the stacker trailer on! How did you make the frame rails work? Are they on top of our truck ones or?
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Old 10-13-2014, 11:18 AM   #7
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The Trailer rails are allot wider then the truck, a friend of mine made a grid at the right height to hold the trailer on the truck frame and create the floor, were getting there. sure is allot more work than i thought.
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Old 11-06-2014, 01:31 AM   #8
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Your twin tanks are connected together under the rear of the cab with a tee, just in front of the cab air suspension. The tee fitting allows one line to feed the engine fuel filter and engine mounted fuel pump. The fuel feed line draws a vacuum on the fuel tanks to feed the engine. The smaller fuel return line goes from the engine to the rear of the cab where another tee splits the return into two lines that return to the tank. Your fuel gauge actually reads the fuel level in the drivers side tank, since the draw/return is approximately the same, the fuel gauge reads approximately correct for each tank. Since the fuel/return lines on the tanks are the same length and size, the flow to/from each tank is roughly the same. If you alter this relationship, one tank will tend to be higher or lower depending on the flow change you induce with your modifications.

If you are going to feed your generator from your tank directly, then you might want to put your additional generator feed/return on the drivers side tank. At least you will have some idea of how much fuel your generator is using. Running the truck will eventually balance out the fuel level in each tank depending on how far you have drawn down the tank with the generator.

You might consider taping the fuel feed/returns ahead of the factory tank tees. Doing this way should keep the flows to/from each tank roughly equal. This would enable you to draw/return to both tanks similar to the way the factory design works. This would potentially avoid the problem with uneven fuel tank levels. You might consider some one way check valves in your generator fuel lines to prevent issues between the engine fuel supply and the generator.
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Old 11-06-2014, 04:54 AM   #9
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all of the systems I've seen pull from only one tank (in a duel/multi tank system).

mine pulls & returns from the passenger side tank (via fittings in the top of the passenger side tank) - and i ASSUME the feed line does not extend completely to the bottom of the tank, to prevent complete consumption of all the fuel in the passenger side tank.

question: since I've notices some un-even consumption (especially on long/road trips), what would happen if i consumed all the fuel from one tank ? won't i be sucking air or inducing air into the line (even if i still have plenty of fuel from the other tank) ?

this past weekend i topped up our tanks after several "local" camping trips and 650 miles of driving (which included a fair amount of generator run time)....my tanks are 60gal each....i put 55 gallons in the drivers side tank and only 20 gallons in the passenger side tank
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Old 11-06-2014, 09:23 AM   #10
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Don, was the engine running during filling? or between filling the one tank before you filled the other tank? I ask because I think the truck tries to equalize the tanks when it's running somehow. I almost always fuel both tanks at the same time. But once I needed fuel real bad and could only find a station with a single pump. I filled up the one tank and then started up and had to do quite a bit of maneuvering to get to fill the other tank. When I filled that it took much less than the first tank. I'm thinking it was equalizing the tanks somehow?
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