Joined: Thu Mar 22 2007, 08:13AM
Location: In the workshop
Posts: 1063
Little update on this. I've located a new tank about 100 miles away from me. That meanss that I will be able to compare the one that has been on, to the new one. If I get back (the guy has quite a few mopars) I'll try to update on things, it should help others with '65's, and possibly '66's.
Joined: Thu Mar 22 2007, 08:13AM
Location: In the workshop
Posts: 1063
Earlier today, I spoke to a guy that has a new Spectra CR20B tank. He's agreed to allow me to borrow it to compare with the old 4-vented one that was on the car, and then sell it to me if it will fit my '65.
One question for you all. The correct tank according to the FPM for a '65 is a single vent one. Does anyone know if it is the exact same tank that is also used on a '66?
Joined: Tue Oct 11 2005, 01:33AM
Location: Calgary, Alberta
Posts: 5893
Are you sure it says single vent?
The reason I ask is flat mounted tanks usually have two, internally configured to vent the front and rear ends of the tank. The premise is that the fuel will move to the rear of the tank while driving up a hill so the vent needs to be at the front. Conversely, descending a long grade will shift the fuel to the front of the tank and block the vent, so a second vent is needed at the rear of the tank. Note the open ends of the rubber lines connected to the vents (two vent no canisters) must be vertically higher than the fuel level when the car is either ascending or descending a steep grade.
Four vent tanks use two of the vents in the same way but the other two are more for vapour and overflow recovery. Vertically mounted tanks like used in wagons and tanks which are mounted much lower than the fill cap don't need anything other than a vented cap (except tanks with vapour recovery canisters).
Joined: Thu Mar 22 2007, 08:13AM
Location: In the workshop
Posts: 1063
I collected the new CR20B tank today. The shape is identical to the 4-vent that came off the car.
One question: Can someone that owns a '66 with a 2-vent tank possibly take photos of the vents, and maybe even measure up the two pipes to give me enough info to fabricate them and fit them to my car in a "factory" way?
Joined: Sat Aug 19 2006, 05:03PM
Location: Ontario, Canada
Posts: 2919
Okay here goes....
First we have the front of the tank with the short vent line attached. The open end of the line vents to atmosphere. The clip at the top of the line snaps into a hole in the frame. I believe the hole is in the crossmember that the rear shocks attach to.
The short vent line measures about 2.5" across and 6.5" long. Note that I lined-up with the 1" marks on the measuring tapes so you need to subtract 1" from the measurements.
This is the long vent line that goes up into the trunk, then back down into the drivers side frame rail.
Here is a long vent line installed in the car. I don't think this is a factory line, just one that someone bent-up to replace the original in my car.