motavated Posted November 8, 2009 Report Share Posted November 8, 2009 I think my car has been leaking air from the gas tank hoses. Will removing the intake emission hose and the extra hoses from my 620 gas tank make any difference? If I dont need them then remove them of course! What do they do anyways... Here is pic of a 620 gas tank I found. Any help is appreciated. :) Quote Link to comment
Iowa Mark Posted November 8, 2009 Report Share Posted November 8, 2009 The way I see it, you have a port on the tank that goes up front to feed the engine and another that returns from the front. Then there is a line that runs up to the fill spout and acts as a vent when you fill up. The last line runs up and ties to a check valve and actually vents the preasure in the tank, because the gas cap is "non vented". They all seem to have a purpose. Quote Link to comment
Pacific coast Datsun Posted November 8, 2009 Report Share Posted November 8, 2009 On my tank im only using 1 of the outlets as the fuel supply line. The other 2 are capped. I dont have a return line or the evap. tank. The 1 i use as the the supply is facing the filer neck... hope this helps. Quote Link to comment
fisch Posted November 8, 2009 Report Share Posted November 8, 2009 On my 521 the evap line spout was rusted, so I had it welded shut. So the only hoses I have coming off of my tank are the fill hose, the overflow hose, and the fuel line. I have the old OEM style gas cap, which I am sure doesn't seal 100% so it allows breathing. I've had no problems! Quote Link to comment
Braden Posted November 9, 2009 Report Share Posted November 9, 2009 when i cleaned and installed my tank i removed the sedning unit to determine which line was the pickup, after that i jb welded the extra lines up, installed tank, hooked up my single fuel line, never had a problem since:):) never leaked either Quote Link to comment
motavated Posted November 9, 2009 Author Report Share Posted November 9, 2009 Cool man, thanks for all the advice. Let me see what I can do to this one. I think its leaking too much air. Thanks! Quote Link to comment
jose84 Posted March 1, 2013 Report Share Posted March 1, 2013 Is there a special way to cap it ? im installing a 77 fuel tank for my 73 620. Quote Link to comment
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