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620 gas tank lines

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stheodore10 View Drop Down
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    Posted: 23 Apr 2014 at 9:49pm

hello all - 

 

im posing due to confusion. the diagram looks good except for one thing - not sure exactly which nipples on the gas tank get which hoses. i have a tank with two nipples on top and one on the side, plus filler neck and sender unit obviously. please help me out! thanks in advance

 

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EzCruiser View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EzCruiser Quote  Post ReplyReply Direct Link To This Post Posted: 23 Apr 2014 at 10:31pm
What year is your truck?
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Knottyhead View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Knottyhead Quote  Post ReplyReply Direct Link To This Post Posted: 23 Apr 2014 at 11:26pm
The small line on the side goes to the fuel pump, that the fuel pick up. The medium size nipple goes to the filler overflow/vent . The small nipple on top near the filler is the return from carb. The other small nipple on top goes to a check valve filter thingy then runs a loop up the filler and back down to a line that goes ????!?????? Are you as confused as i am. I am getting this from my failing memory.

Edited by Knottyhead - 23 Apr 2014 at 11:30pm
Still on the never ending quest to squeeze more from an L series
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Knottyhead Quote  Post ReplyReply Direct Link To This Post Posted: 23 Apr 2014 at 11:40pm
Your drawing...#1 goes to the side of the tank the pick up and runs to fuel filter/ pump/carb.                                                      #2 goes to the medium size nipple next to the filler..           #3and 4. I am not sure cause i cant see the other end and i think # 5 is your return from carby........ unhook your return and inlet in the engine bay and blow compressed air and find were each metal line on the frame rail runs, if its a late 70's it will have one of those line going to a charcoal canister if its 60's and early 70's you may not have a return line.......wow me is cornfused now....
Still on the never ending quest to squeeze more from an L series
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Knottyhead View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Knottyhead Quote  Post ReplyReply Direct Link To This Post Posted: 23 Apr 2014 at 11:41pm
Please do not use black letters on black background as it strains the bad eyes of us old farts. Please and thank you.
Still on the never ending quest to squeeze more from an L series
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