Hey everybody, quick question, couldn't find anything useful on google or searching here. I have a locking gas cap on my 70 SS 396 that leaks really bad. I'm looking for a non-locking replacement and I can't figure out if I need a vented, non-vented, or ECS gas cap. fuel tank, from what I can see has 2 lines leading to the engine compartment. One obviously goes to the fuel pump, the other thinner one is connected to a rubber line that someone stuck a bolt into to plug it up.
Do you have a charcoal canister? That would be the "vent". Not really a vent but a way to send fumes to the carb and relieve pressure so then a non-vented cap would be what you need. Maybe that's where the hose goes/went?
My initial thought was that the 2nd line went to a charcoal canister originally. Currently there is no canister, so I figured I'd ask the experts here what is up...
If the plugged line is a 1/4" it is a return line which would have connected to the fuel pump. If it is 5/16" or 3/8" it would have gone to a canister. Does it end on the passenger side by the fuel pump?
If it is the 1/4" line you will need a vented cap. If it is either one of the others it would have come with a non-vented cap but you would need to do something to allow the tank to vent. Maybe some pictures would help us help you.
464 is correct on this. to use the non vented cap you will need to supply some method of venting the tank. without the vapor canister i would run the vented cap until you can correctly repair your fuel system . if the line went to the fuel pump it was to help ward off vapor lock by bleeding off fuel and vapor bubles back to the tank
Hey everybody, quick question, couldn't find anything useful on google or searching here. I have a locking gas cap on my 70 SS 396 that leaks really bad. I'm looking for a non-locking replacement and I can't figure out if I need a vented, non-vented, or ECS gas cap. fuel tank, from what I can see has 2 lines leading to the engine compartment. One obviously goes to the fuel pump, the other thinner one is connected to a rubber line that someone stuck a bolt into to plug it up.
yup, the plugged line is 1/4", and the fuel supply line is 5/16". I looked at the assembly manual and saw that there are vented tanks (passenger front side of tank, 2 large vent tubes) and non-vented. I have a non-vented tank. So I'm thinking to go with the vented cap and write myself a note to get the correct fuel pump in the future.
thanks bobby78, 464elky, ccc, and gilby for setting me in the right direction :beer:
gilby, funny thing I noticed. You describe the cap (correctly) as vented, the link says vented, the title of the part says non-vented, description says non-vented, and the picture shows a vented cap. I wonder what I'd get if I ordered it? :smileyb:
thanks bobby78, 464elky, ccc, and gilby for setting me in the right direction :beer:
gilby, funny thing I noticed. You describe the cap (correctly) as vented, the link says vented, the title of the part says non-vented, description says non-vented, and the picture shows a vented cap. I wonder what I'd get if I ordered it? :smileyb:
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
El Camino Central Forum
892K posts
41.8K members
Since 2002
A forum community dedicated to Chevy El Camino owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more!