Can I remove the extra hoses from the 620 gas tank?

[motavated]

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. :)

 

[Iowa Mark]

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.

[Pacific coast Datsun]

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.

[fisch]

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!

[Braden]

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

[motavated]

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!

[jose84]

Is there a special way to cap it ? im installing a 77 fuel tank for my 73 620.