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Old 10-17-2016, 08:38 AM   #11
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What tank does it pickup from?
The driver's but there is a crossover hose that connects the bottom of the two tanks so it really should not matter.
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Old 10-17-2016, 09:58 AM   #12
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It takes a fairly long time to equalize. I must have the only somewhat accurate gauge if I fill at 1/4 tank I take 38 gallons on the passenger side and 12 on the drivers and those numbers are repeatable.
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Old 10-17-2016, 10:38 AM   #13
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If this were true would not the tanks cross fill? I was under the impression that the tanks were independent and would not cross fill to each other. Or is it that it is coupled but the hose a much smaller diameter than a filler hose so it would not have enough flow to actually cross fill the tank from the other side faster than an actual pump?
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Old 10-17-2016, 10:52 AM   #14
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In case anyone is interested in learning more about how our Seneca's fuel equalization system works I have attached a document that has some information on the system. While a transfer hose connecting the bottom of our fuel tanks would be more simple and would possibly allow filling from just one side, they are vulnerable to damage and then dumping the entire contents of both tanks onto the road. Sometimes debris in the road gets kicked up and damages the transfer line. Our units could be vulnerable to that scenario if they had a lower transfer line.

In my "prior-to-retirement" life as a career firefighter we had numerous instances where a semi-tractor damaged the transfer line and dumped hundreds of gallons of diesel that we then had to contain. Very costly to clean up!
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File Type: pdf Fuel transfer system.pdf (17.4 KB, 45 views)
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Old 10-17-2016, 11:10 AM   #15
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Our units could be vulnerable to that scenario if they had a lower transfer line.
Does your Seneca not have a hose at the bottom of each tank connecting the two tanks? Mine does. I also have another Freightliner M2 truck and it does not have that hose. Maybe something that Jayco adds? Maybe for the generator usage when the engine is not running to equalize the tank level?
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Old 10-17-2016, 11:28 AM   #16
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Here I thought the fuel return line only went to the passenger side on our trucks. Good information especially as we travel roads that have no truck stops or travel centers. I have been in the habit to find a station I could fill the passenger side then drive to the next station I could get the drivers side especially when towing the one ton dually.
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Old 10-17-2016, 11:49 AM   #17
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Originally Posted by AaronM View Post
Does your Seneca not have a hose at the bottom of each tank connecting the two tanks? Mine does. I also have another Freightliner M2 truck and it does not have that hose. Maybe something that Jayco adds? Maybe for the generator usage when the engine is not running to equalize the tank level?
Mine does not. I have attached a picture from underneath that shows my setup. The engine supply and return lines come off the side of the two tanks and curve up and over the transmission where they connect to the equalization system components. Nothing connecting the bottom of the two tanks directly. My chassis was manufactured in late-2013, I wonder if Jayco or Freightliner changed something?

The crossover lines I saw on semis were a hose of at least 1" diameter, sometimes bigger. Does yours have something like that?
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Old 10-17-2016, 11:53 AM   #18
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My 2013 chassis (2014 37fs) will equalize over time if I just fill one tank. Filling the left tank will indicate full on the gauge, filling the right one has little effect on the fuel gauge.
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Old 10-17-2016, 12:34 PM   #19
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The crossover lines I saw on semis were a hose of at least 1" diameter, sometimes bigger. Does yours have something like that?
It does, yes. Has a valve on each end also. I will get a picture tonight.
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Old 10-17-2016, 12:38 PM   #20
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It does, yes. Has a valve on each end also. I will get a picture tonight.
Very interesting. Look forward to seeing what it looks like.
Did you purchase your unit new?
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