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Old 06-23-2013, 06:52 PM
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No fuel from the rear

My front tank runs fine, but I have run out of fuel twice while trying to use my rear fuel tank. When I hit the switch to the rear tank it runs fine for a bit but eventually I use up the left over fuel in the lines and I'm stuck on the side of the road until I swap back to the front and bleed the air out of the line. My fuel gauge reads both tank levels properly. Possibly related, when I switch to the rear tank, my fuel pressure gauge drops to about 28psi. Any ideas guys?
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Old 06-23-2013, 06:57 PM
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Sorry, truck is a 1995 F-350 CCLB
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Old 06-23-2013, 07:38 PM
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How much fuel is in the rear tank?
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Old 06-23-2013, 08:00 PM
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little over 3/4 tank
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Old 06-23-2013, 08:46 PM
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Drop the tank and clean out the screen. It's probably clogged up causing you to loose flow.
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Old 06-23-2013, 09:48 PM
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Is there an easy way to drain the fuel before dropping the tank? I don't have a floor jack to drop it with, got nothing but knees and elbows... My neighbor suggested that I use a Windex bottle top with a hose attached and put it down the filler neck but that sounds like it would take forever.
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Old 06-23-2013, 10:58 PM
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Half a dozen feet of 3/8" vinyl hose and siphon into fuel cans?
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Old 06-24-2013, 05:32 PM
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After a few mouthfuls of diesel and some new fuel fitting removal tools I got the tank dropped. Turns out the screen was perfectly clean, although it was floating around in the bottom of the tank... The screen housing was shattered and had hundreds of little pieces floating around the bottom of the tank. It's all cleaned out now, but the big question of my day is do I really need that screen housing? I understand it's purpose, but the tank is clean now and I'm not worried about my kids dropping toys or anything into it... Will the metal tube reach far enough down into the tank to achieve suction or will it start sucking air around 1/4 tank? 1/2 tank?

Bigger question, since my pickup tube wasn't clogged why wasn't I getting any fuel from the rear tank?
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Old 06-24-2013, 05:52 PM
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^^^^ That's why I asked about the tank level. That "showerhead" commonly falls off, but typically it only means that you "run out" of fuel in that tank at about 1/4 tank. Lot of fellas just run an extension all the way down to the bottom of the tank. But you've still got something else going on, if it's not drawing at 3/4. Maybe one of the broken-off bits somehow got sucked up. I'd start by removing the quick-disconnects (if you haven't already), and seeing if you can at least blow air through the pickup line from the outside. I'd "back blow" it, just in case it's something that got stuck right in that section before the quick-disconnect.
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Old 06-24-2013, 08:11 PM
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Gotcha, I blew through the pickup tube and ran a pipe cleaner through it confirming that it wasn't blocked. I also ran an old speedometer cable piece (3') as far through the fuel line as I could confirming that it wasn't blocked forward of the tank as well. After I refilled the tank however, I encountered a new problem - no start. If I turn the key to the rear I've got full accessory power and all is well. If I turn the key forward I can hear the 'open door jingle' very weakly like the battery is dead, my dash gauges flicker at extremely low brightness and my aftermarket gauges don't even turn on. If I turn the key all the way, there is nothing. Starter doesn't even think about engaging. Disconnected and cleaned the battery terminals, tried to disconnect the GPR to isolate the problem and checked all the fuses. The only thing that is out of the ordinary is that I have a fast clicking noise that sounds like it is coming from the fuse box under the hood. Anyone got a clue what is happening? I really need to get this running to tow something tomorrow.
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