But good one's 
I'd move things.. don't know the rest of the question,,, sorry.... 
Fuel tank vent, return lines: Need advice
Thread Starter
Instructor
Joined: Apr 2000
Posts: 165
Likes: 0
From: Vacaville California
Fuel tank vent, return lines: Need advice
I'm in the middle of a frame-up rebuild on my '75, upgrading wherever I can. I'm ready for the fuel system. I have Earl's -8 flex hose for the supply line (starting to wonder if its outside dimensions are so fat as to get pinched between frame and body when the body goes back on...?).
It sounds like I should install a return line to avoid vapor lock: correct? Any way around having to install a vapor line? Should vapor line run along right or left frame rail?
As far as the stock vent line, did it go to the charcoal canister and run along the left frame rail? For simplicity's sake can I get a non-vented tank (or else plug the vent at the tank) and simply use a vented gas cap, eliminating the whole line and canister? Any drawbacks to that?
And last, I need a new tank. Will an alternate year's tank fit in my '75 and give me a bit more capacity, or should I stick with the stock replacement? Any brand(s) made better quality than other, or are they all about the same (Dr. Rebuild vs. Ecklers, etc. about $50 range).
Thanks for any help!!
Patricia
It sounds like I should install a return line to avoid vapor lock: correct? Any way around having to install a vapor line? Should vapor line run along right or left frame rail?
As far as the stock vent line, did it go to the charcoal canister and run along the left frame rail? For simplicity's sake can I get a non-vented tank (or else plug the vent at the tank) and simply use a vented gas cap, eliminating the whole line and canister? Any drawbacks to that?
And last, I need a new tank. Will an alternate year's tank fit in my '75 and give me a bit more capacity, or should I stick with the stock replacement? Any brand(s) made better quality than other, or are they all about the same (Dr. Rebuild vs. Ecklers, etc. about $50 range).
Thanks for any help!!
Patricia
Team Owner
Joined: Aug 2000
Posts: 21,457
Likes: 463
From: Massillon,Ohio USA
2020 C3 of the Year Finalist - Unmodified
Cruise-In VI Veteran
St. Jude Donor '08-'09-'10-'11-'12
The vent line runs along the left frame rail parallel to the main brake line. When I removed the "bladder" from my '75's fuel tank, I simply plugged the vent line and removed my canister. You do need to run a vented cap when doing this to let the pressure "breathe", as this is what the canister did.
Thread Starter
Instructor
Joined: Apr 2000
Posts: 165
Likes: 0
From: Vacaville California
Paul, thanks for sharing how you handled your vent line and canister. I think I will do the same. It's interesting you removed the bladder from your tank. I've noticed the '74 tank is 18 gallons but my '75 is only 14 gallons: does that have to do with the bladder?
Mark, have you had any problems since you removed your return line? I've heard you can get vapor lock; is this the case?
Patricia
Mark, have you had any problems since you removed your return line? I've heard you can get vapor lock; is this the case?
Patricia
Melting Slicks
Joined: Nov 2003
Posts: 2,668
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From: St. Charles Mo
CI 5 & 8 Veteran
If you think you will ever have the desire for Fuel Injection, go ahead and run an oversized return line now. (3/8" min) Also make sure the gas tank return nipple is inlarged to accomodate the 3/8" I.D.
Bullshark
Bullshark
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Joined: Aug 2000
Posts: 21,457
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From: Massillon,Ohio USA
2020 C3 of the Year Finalist - Unmodified
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St. Jude Donor '08-'09-'10-'11-'12
Originally Posted by singedfur
Paul, thanks for sharing how you handled your vent line and canister. I think I will do the same. It's interesting you removed the bladder from your tank. I've noticed the '74 tank is 18 gallons but my '75 is only 14 gallons: does that have to do with the bladder?
Patricia
Patricia
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Joined: Jun 2001
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From: Virginia USA
Get your tank from Quantum Products. You get everything, sending unit o-ring, new locking ring, filler gasket and o-ring bolts. The tank itself is 100% correct also. Right around $200. You could probally get a tank from an 68 thru 73-4 (I don't know the first year the bladder was added) and it should work fine. If you are going to eliminate the vapor return system then get a tank that didn't use the vapor return system, example: 1970 LT-1 350.
