MTFCA Forum

I have been working through systems hoping for drama free starting, took out gas tank to clean and re position-- the filler tank had rotated so the seat tin covered the filler cap 1/2 way, in looking closely the gas cap has no vent, what was used for vent ?

My 1924 has a gas cap like that, there is a small hole in the top casting and a small hole in the bottom splash shield. The holes are intentionally out of alignment to reduce the chances of gas splashing out of the cap on bumps.

The holes looked too small for my taste, so I drilled them out to the next size up.

There's no baffle inside mine, got some roofing copper, I'll solder it in and make a baffle is what I am thinking---

Kurt in NJ wrote: ↑

Thu Jan 06, 2022 3:12 pm

There's no baffle inside mine, got some roofing copper, I'll solder it in and make a baffle is what I am thinking---

I'm not sure you're going to be able to solder anything to that diecast cap. Look at the end of each of the "wings" on that cap. I've seen before, where vent holes were drilled into an end.

BTW, that's not truly a Model T gas cap. A "T" cap would not have the Ford oval and would not be marked "FoMoCo". That being the case, it may not have even begun life as a gas cap for anything. Hence, the reason for no vent hole, (if you don't find one as I mentioned above).

That is a radiator cap for one of the more modern English Fords. Not T.

The hole on those caps was on the small flat side of the butterfly grip and then at 90 degrees on the inside, no baffle on the inside, common on Canadian T's.

Here is a previous thread discussing these English radiator caps.
http://www.mtfca.com/discus/messages/82 ... 1525297121

It's brass, and yes English Ford, I remember now, had a 48 prefect with that cap.
I made a baffle, drilled both ears at angle into top, formed piece of copper roof flashing and soldered it in --- going to be good enough
I think in the 60s it was being sold as replacements, the coils have 1963 dates, I figured this car got a "60s" type restoration, mostly paint on decent body

Well done!

If it were me, I would get it nice and hot and flow more solder in to fill the gap a full 360 degrees around the circumfrence.

Without soddering all round, there is hardly a need for the vent hole in the baffle.

Allan from down under.

I had a reasonable press fit, but didn't want to ever find it over the feed, as I was soldering the thought came to me that with 2 vent paths the chances of total loss of venting became a lot less--- being it's a stock 17 I have to think of any problems the starter might have.

I have a late model 25-7 pot metal gas cap in my car. Recently the diffuser plate wound up in the bottom of my gas tank. I got it out with a magnet, and I snapped it back in place this time with some crazy glue. I'll see how that works! It stayed in for ten years previously.

Kurt in NJ wrote: ↑

Fri Jan 07, 2022 4:40 pm

It's brass, and yes English Ford, I remember now, had a 48 prefect with that cap.
I made a baffle, drilled both ears at angle into top, formed piece of copper roof flashing and soldered it in --- going to be good enough
I think in the 60s it was being sold as replacements, the coils have 1963 dates, I figured this car got a "60s" type restoration, mostly paint on decent body

Excellent! Didn't look at all like brass in the first photo.