 Is gas tank cap vented?, tank cap |
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| tomrev |
 Jan 9 2016, 02:35 PM
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Member  Group: Members Posts: 231 Joined: 25-February 14 From: N. Mich. Member No.: 17,037 Region Association: None  |
As I am finishing up new fuel lines, with clean, empty tank, it seems like the tank holds a slight pressure, when blowing thru the return line. I'll be using the bosch 044 fuel pump, which moves a lot of fuel, and want to make sure there is no pressure fighting the flow back to the tank. Does the stock '75 cap have any self venting property's, or does all the tank venting go thru the TINY vent port, that heads to the charcoal canister? If so, have any of you added a bigger vent, as a fuel cell would use? Thanks, Tom
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| damesandhotrods |
Jan 11 2016, 06:05 PM
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Senior Member Group: Members Posts: 568 Joined: 26-September 10 From: Santa Cruz California Member No.: 12,218 Region Association: Northern California |
QUOTE(tomrev @ Jan 9 2016, 01:35 PM)  As I am finishing up new fuel lines, with clean, empty tank, it seems like the tank holds a slight pressure, when blowing thru the return line. I'll be using the bosch 044 fuel pump, which moves a lot of fuel, and want to make sure there is no pressure fighting the flow back to the tank. Does the stock '75 cap have any self venting property's, or does all the tank venting go thru the TINY vent port, that heads to the charcoal canister? If so, have any of you added a bigger vent, as a fuel cell would use? Thanks, Tom The gas tank vent is designed to prevent a vacuum from building up in the fuel system, and as a smog device to control gas vapors. If your tank is pressurized you have got a different problem to solve. Carbs are a low pressure fuel system; you should not have any pressure in the tank… |
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Posts in this topic
tomrev Is gas tank cap vented? Jan 9 2016, 02:35 PM
damesandhotrods The fuel tank vents to atmosphere through the char... Jan 9 2016, 02:59 PM
tomrev
The fuel tank vents to atmosphere through the cha... Jan 9 2016, 03:11 PM whitetwinturbo ..........so how does fuel tank vent if there is n... Jan 9 2016, 03:36 PM The Cabinetmaker
..........so how does fuel tank vent if there is ... Jan 9 2016, 03:50 PM tomrev
..........so how does fuel tank vent if there is... Jan 9 2016, 04:09 PM damesandhotrods
..........so how does fuel tank vent if there is ... Jan 10 2016, 05:52 PM Rob-O
..........so how does fuel tank vent if there is... Jan 10 2016, 05:01 PM Blue6
..........so how does fuel tank vent if there is... Jan 10 2016, 05:48 PM Jeff Bowlsby Actually there is an expansion tank in the pathway... Jan 11 2016, 01:53 AM whitetwinturbo .........where is that "expansion" tank? Jan 11 2016, 11:00 AM Kansas 914
.........where is that "expansion" tank... Jan 11 2016, 12:13 PM 76-914 Need one? I've got one left over from my conve... Jan 11 2016, 03:37 PM tomrev The gas tank vent is designed to prevent a vacuum ... Jan 11 2016, 06:22 PM |
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