Fuel tank vacuum lines - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71RestoRod · 01-31-2006, 09:02 PM

It's a vapor recovery system to trap and burn fuel vapors from the gas tank that would otherwise be released to the atmosphere. If the lines are blocked off, you should make sure that you have a vented gas cap on the tank.

I hooked mine back up. I found that with the in-tank pump that I have installed for the EFI, there was a lot of pressure building in the tank. Hooking up the vapor lines fixed the pressure problem and got rid of the gas smell that had been emanating from the cap.

01-31-2006, 09:02 PM	#2
71RestoRod Registered User Join Date: Sep 2003 Location: Evergreen, CO Posts: 492	Re: Fuel tank vacuum lines It's a vapor recovery system to trap and burn fuel vapors from the gas tank that would otherwise be released to the atmosphere. If the lines are blocked off, you should make sure that you have a vented gas cap on the tank. I hooked mine back up. I found that with the in-tank pump that I have installed for the EFI, there was a lot of pressure building in the tank. Hooking up the vapor lines fixed the pressure problem and got rid of the gas smell that had been emanating from the cap. __________________ 71 Blazer / GMPP ZZ383 / MPFI / 700R4 / 4-Wheel Disk / Ground-up frame off almost completed resto-mod



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