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Old 04-14-2014, 02:49 PM
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Something somewhere is leaking

Hey guys tryd to see if anyone had a similar issue but no luck.

I noticed out of no where my rear tank started getting terrible fuel economy went from 175miles a tank to 80-100 miles on the rear tank , I looked for a leak couldn't find anything. I left for a week got back and drove the truck for the day and filled it up ,

when I got home from going out with a buddy, there was a huge puddle of diesel under the truck it seems to be coming from a line that vents the sending unit on the front tank anyone seen this issue from over filling the tank or.. ? I don't think this is causing my low fuel mileage issue , but the front tank still gets normal fuel mileage ..

Thank you
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Old 04-14-2014, 03:04 PM
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Okay, memory test - before you switched to the rear tank most recently, do you remember what the level was in the FRONT tank? Switch over to the front tank again, and turn the key and check the gauge. Is there, by any chance, MORE fuel in the front tank now than there was before you switched to the rear?

Don't be shocked if there is. The tank selector is actually TWO switching valves. One for the supply, one for the return (thus, six ports). Sometimes it acts up, and only switches the supply and not the return (or vice versa). So you may be in a situation where it's supplying from the rear tank, but returning to the front. This would (1) make it look like your fuel economy on that tank SUCKS big-time, and (2) eventually overfill the other tank. This sounds suspiciously like what's happening to you right now.
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Old 04-14-2014, 03:30 PM
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That's a good point!!! That's exactly what it is doing!! The other day i put 70$ in the rear and the truck was empty in 90 miles but when I switch to the front tank I had half a tank and i rememebr it being empty before!! Wow thanks man !! So how do I stop this now!
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