Author Topic: 1932 Pontiac Six build  (Read 83153 times)

Rattiac

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Re: 1932 Pontiac Six build
« Reply #585 on: June 17, 2021, 10:58:47 PM »
Let's talk gas caps.
I was talking with someone earlier about why my car isn't running (fuel pump) and he said I should look at my gas cap cause it probably isn't vented.
He couldn't find one for his car (same year) and had to drill a small hole to vent it.

I have noticed when I get a tank of gas and remove the cap I get a quick sucking hiss.
With a full tank it pushed air out when cap removed.

Hmmm something to ponder.
He did try to talk me out of going to electric pump.

sixball

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Re: 1932 Pontiac Six build
« Reply #586 on: June 18, 2021, 12:15:11 AM »
With old cars it's like the crank case breather. They vented out into the world and caused climate change. Now they capture  the dangerous emissions from the crankcase and fuel tank and run it back through the engine and the when it comes out the exhaust somehow it is cleaner. Anyway old gas caps were vented so outside air could fill the space created as the fuel is used.
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62131

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Re: 1932 Pontiac Six build
« Reply #587 on: June 18, 2021, 08:09:13 AM »
Over filling your fuel tank will keep it from venting  properly 

sammons

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Re: 1932 Pontiac Six build
« Reply #588 on: June 18, 2021, 08:22:59 AM »
Yep, non-vented gas cap on oldies is a no-no. Creates a vacuum as the fuel is used that makes it hard for the pump to over come.
   My brother helped his buddy move to Calif, he drove his Vette and buddy drove his '53 GMC p.u.. About a 1/4 tank used it would quit running, non vented cap. Brother pulled cap, stuffed a rag in till next town and got a vented cap😁

I can't remember which make, but they went to a non vent cap but ran a breather line (kinda like a return line) up with a breather type cap. Later it ran to the emmision charcole canister and to carb. Think Mopar ran a breather line up in the trunk, it made a loop up high, then back thru floor and into the frame rail to vent.
   
I've always ran mechanical, but on a few I plumbed in an electric as a back up or to get pressure up after one sat for a long time.
« Last Edit: June 18, 2021, 08:47:08 AM by sammons »

chopper526

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Re: 1932 Pontiac Six build
« Reply #589 on: June 18, 2021, 10:32:45 AM »
On my '32 I used a vented tank with a non vented cap, but 100%, you have to vent the tank somehow.
Tighten it up til it strips, then back it off a quarter turn

Rattiac

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Re: 1932 Pontiac Six build
« Reply #590 on: July 10, 2021, 06:29:20 PM »
Well heres my cap. I think its vented. 
The package didnt say .

TFoch

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Re: 1932 Pontiac Six build
« Reply #591 on: July 10, 2021, 06:52:04 PM »
I blocked the vent on top of my tank because I couldn't route it higher that my filler neck.  Then I used a vented cap.  It may taste like gas but you should be able to blow into those holes and check to see if it is vented.
Home schooling my grandkids gets in the way of finishing my car

sixball

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Re: 1932 Pontiac Six build
« Reply #592 on: July 11, 2021, 10:15:21 PM »
What else would the holes be for?
The probability of life originating from accident is comparable to the probability of the unabridged dictionary resulting from an explosion in a printing shop.  Edwin Conklin

Rattiac

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Re: 1932 Pontiac Six build
« Reply #593 on: July 11, 2021, 11:40:12 PM »
I pulled off the cap,  cleaned it off and blew into it and nothing  :o.
If it is vented I wonder how much psi it takes. 
Tried a few times.

« Last Edit: July 12, 2021, 10:29:23 AM by Rattiac »

chopper526

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Re: 1932 Pontiac Six build
« Reply #594 on: July 12, 2021, 08:45:11 AM »
I do believe that is a vented cap. My cap is a solid piece of aluminum, my tank is vented. I ran a piece of rubber hose straight up and put a "L" curve in the line to keep dirt out.
Tighten it up til it strips, then back it off a quarter turn

62131

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Re: 1932 Pontiac Six build
« Reply #595 on: July 13, 2021, 07:21:40 AM »
Tanks must be vented; be careful in selecting your vented cap if it is not correct for you tank neck it can fit to tight and crush the gasket and cut off the air supply 

Rattiac

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Re: 1932 Pontiac Six build
« Reply #596 on: July 14, 2021, 09:37:16 PM »
Just ordered a gas cap from The Filling Station.  8)

Wait..... theres some irony there. 😄

Rattiac

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Re: 1932 Pontiac Six build
« Reply #597 on: July 22, 2021, 12:03:01 AM »
New cap came.  Compared it with the old one.  Pretty similar.
Well at least I know the cap is right.

Probably start looking into a fuel pressure regulator soon.

 


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