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Old 02-14-11, 08:58 PM   #1
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SC 1979 Rx7 gas tank help

My 1979 rx7 gas tank (stock) as 4 hose connections on top ...
The rear most one goes to a fitting in a rubber gasket and thats the Fuel vapor valve. Do you have to have this on the car?
I was told the Fuel vapor valve lets air into the gas tank but does not let gas out without it the gas tank will not work
What can you do if you can not find a vented gas cap, and my vent line connection is broken and no good???
I need help badly!
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Mazda RX-7 1979 (Old School) with new mods 13b
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Old 02-14-11, 09:01 PM   #2
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SC Other Pic of tank

here
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Old 02-14-11, 09:04 PM   #3
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1979 fuel lines

"So with the tank positioned like it was in the car there are 4 hose connections. I'll reference the front most one as number 1 and work my way back.

The first one is the return line and its smaller than the feed.

The second one is the main fuel feed line and its larger and sticks up higher than the first.

The third one is for the cut and check valve and can be capped or connected, your choice.

The rear most one goes to a fitting in a rubber gasket and thats the vent line. If you cap it off get a vented gas cap."

(t_g_farrell)

Is this right for the 1979 rx7?
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Old 02-14-11, 09:23 PM   #4
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Post a WTB in the parts for sale section. Someone should have a junk tank laying around. I probably have one if I could ever find it.
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Old 02-14-11, 09:23 PM   #5
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SC 1979 rx7 Check and cut valve

what does the Check and cut valve do vs the Fuel vapor valve???
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Mazda RX-7 1979 (Old School) with new mods 13b

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Old 02-14-11, 09:33 PM   #6
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trochoid i did, and no one had the part
just tried again... i hope someone has it
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Old 02-15-11, 02:16 AM   #7
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Quote:
Originally Posted by garrx7 View Post
what does the Check and cut valve do vs the Fuel vapor valve???
Think check & cut valve is a safety valve for roll-over/spill protection...
??

Stu Aull
80GS
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Old 02-15-11, 02:22 AM   #8
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I'll be in my storage unit this week, I'll look for one. Hopefully they didn't change much, all my stuff has been S3/4.

Cut and check valve is for rollover protection.
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Old 02-15-11, 08:30 AM   #9
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SC

cool thank you trochoid
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Old 02-15-11, 08:30 AM
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