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Old 04-18-2015, 10:35 AM   #11
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Did some research and spoke with Freightliner. The rig pulls from the drivers side tank which is where the sender is. The tanks gravity feed together. This is what Freightliner told me. To make the gauge function properly was told to always fill the passenger tank first. Seemed doubtful to me. So I tried it with just a short trip and the gauge seemed accurate.

We just took our first trip of the year. Filled up, passenger side first and off we went. Stopped after 420 miles and was reading barely under 1/2 tank. Filled up with the passenger tank taking 20 gallons, drivers tank exactly 15 gallon. Both fill-ups I let the foam settle and filled exactly to the bottom of the neck to be accurate. So right at 12mpg with the cruise set at 64mph, 95psi in the tires. Not bucking any wind or hills.

Filled again the same way and went another 70 miles and the gauge just came off full. Looks like our capacity is right at 70 gallons? So try filling the passenger side first and see what happens. So far so good with us.
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Old 04-18-2015, 05:16 PM   #12
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Mr. Oz, did the passenger tank gravity feed to the driver's side while filling the passenger side?
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Old 04-18-2015, 05:40 PM   #13
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Quote:
Originally Posted by Watt View Post
Mr. Oz, did the passenger tank gravity feed to the driver's side while filling the passenger side?
I think it's a slow feed. Could not tell in the short time of filling. There may be some sort of valve that opens or releases by filling the passenger side first. I'm going back to Freightliner mid May for a passenger power window motor. I'll ask to see a fuel diagram to understand what is going on.
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Old 04-18-2015, 05:46 PM   #14
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Thanks, I'm also arranging to take ours to Freightliner for cab a/c work and will ask about the fuel system.
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Old 04-20-2015, 06:21 PM   #15
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Had a chance to fill up with diesel today. Mr. Oz's process worked great; filled passenger side 1st with 18 gallons, then driver side with 18 gallons. First time my fuel gauge has shown full tanks. Still planning on discussing the system with Freightliner next week.
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Old 04-20-2015, 07:58 PM   #16
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Cool.... Let us know how it registers as you drive. Mine has been working perfect.
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Old 04-20-2015, 08:37 PM   #17
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Will do, only drove 60 miles from Flying J to home. Gauge showed slightly less than 1/8 used at 65 mph on interstate and farm roads. I did notice as we accelerated the gauge would drift, but then level out. I'm guessing it's due to fuel movement in the tank.
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Old 04-21-2015, 09:11 AM   #18
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Most fuel gauge circuits have a buffer to prevent gauge fluctuations while driving. That along with baffles and a sump in the tank give smooth gauge movement. I'm guessing the Seneca is not that sophisticated.
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Old 04-29-2015, 08:44 AM   #19
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1500 miles this season so far. Went until the gauge showed 1/8 tank after filling passenger first. 50 gallons filled it up. Pretty close
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Old 04-29-2015, 10:45 AM   #20
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Thanks Mr. Oz. What was your miles/gallon for the 50 gallons?

I took my unit in to Freightliner yesterday for some a/c work. The service writer explained fuel is pulled from the driver's tank and that both tanks are equalized thru a vacuum valve system. He was unaware of the process to fill passenger side first or what the useable fuel is in the tanks.

I'm currently at about 1/2 tank on the gauge with over 230 miles. Will fill up after I get it out of the shop and report miles per gallon.
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