LaMans gas cap help

Mike Hausner · #1 (**permalink**) 07-14-2003, 04:06 PM

Comparing the assembly manual with the parts I have you would think they were from two different kits. The manual shows the filler & mounting flange (which I have)and an adapter plate with a gasket top & bottom (which I DON'T have) and the "reducer tube" (which is nothing like the one I have). The "reducer tube I have is a circular flat plate with a 1/2" & 1-1/2" tubes welded to it.
Now my questions are:
What is this "adapter plate" made of & how thick is it??
What are the gaskets made of (and possibly where I can get the material to make them)??
Is the assembly of the parts I have different than what is shown in the manual? i.e. Do I have to use the adapter plate with two gaskets?

dscott · #2 (**permalink**) 07-15-2003, 08:27 AM

Mike, somewhere along the line the design changed but the manual didn't. You need the adapter plate for the hookup to the tank hose and the vent. It is made of steel so I would use a good paint that is fuel resistant so it doesn't rust. You need at least 1 gasket which should have come with the cap. The gasket is made of rubber so you could make one. The adapter goes in first, then the gasket, the aluminum lemans plate is next, then screw on the cap. If you want to make 2 gaskets you would put 1 between the body and the adapter also.
Don

petek · #3 (**permalink**) 07-15-2003, 09:44 AM

Well, if it looks anything like:

...then I've got some pictures and what-not at:
http://www.birch.net/~petek/cobra/101/jan3.htm

Mike Hausner · #4 (**permalink**) 07-16-2003, 07:21 PM

Thanks for the replys guys. It looks kike I can mount the adapter piece from the topside of the fender and I'll have to find some rubber sheet to make the gasket between the screw on ring and my adapter. If I'm understanding you correctly I don't need the extra flat ring piece that is shown in the manual. I'm considering getting a gas filler neck and installing it under the LaMans cap so I can use a locking gas cap. That LaMans cap is just too tempting for the curious. Your thoughts on this?? MH

dscott · #5 (**permalink**) 07-16-2003, 08:52 PM

Mike, that's a great idea. It's also a good safety for gas not coming out in a roll over. The extra piece is not needed with the setup you have.
Don

Jack21 · #6 (**permalink**) 07-19-2003, 05:35 PM

Couple of things:

Mu LeMans cap came from europaspares, and didn't come with gaskets or adapter. Purchased a foot of 1 1/2" fuel filler hose with the cap.

Gasket can be made with rubber plumbing stock from plumbing supply dept.

Fuel filler adapter can be made from exhaust adapter. 2" id x 1 1/2" od.

Filler pipe can be made from 2 lengths of 1 1/2" exhaust tubing 90 deg pieces welded or epoxied together. It doesn't need painting.

The 1/2" vent can be made from 1/2" hose x 3/8 NPT brass connector installed in filler neck. 1/2" fuel line to tank.

Connect each end of filler pipe to filler neck and tank inlet with 3" - 4" of fuel hose at each end, secure with hose clamps.

For extra insurance, run an electrical ground wire from filler neck to frame.

NOW!!! Since the filler cap unscrews so easily, drill and tap a 8-32 hole at the cap to adapter interface at installed tightness, under the cap rear hinge. On final assembly, install an 8-32 stainless setscrew. It cannot be seen by casual observation, cannot be removed except with the correct size allen wrench, and will secure the cap to the adapter preventing its removal by theft or vandalism.