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> Is this the right gas cap?, seems to leak
98101
post Dec 14 2017, 07:06 PM
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I finally put enough miles on this new-to-me 1970 914-4 to refuel it. Since then I've noticed a strong gasoline smell after hard acceleration. I've tried fiddling with the gas cap to get it to seal better, but I'm also wondering if it's the correct one for the car. Many years ago I had a 1975 and 1973 and don't remember the gas cap looking like this.

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Dave_Darling
post Dec 14 2017, 07:22 PM
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The 75 cap would have been different. The 73 cap would have been like this--but someone painted this one.

I believe there is a seal on the underside of the cap; it can fail after a few decades.

Double-check your charcoal canister lines. If they are unplugged they can lead to a gas smell.

I think there is a gasket between the fuel filler neck assembly and the tank. A leak there might possibly give you a fuel smell too.

The tank often rusts where it rests on the shell of the car--there are felt pads that can trap moisture and lead to pinholes.

--DD
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76-914
post Dec 14 2017, 07:23 PM
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The 75-76 had plastic caps. Prior to that they were metal with several flutes around the cap to grab onto. Your's doesn't appear to have those flutes. (IMG:style_emoticons/default/beerchug.gif)
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mepstein
post Dec 14 2017, 07:39 PM
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QUOTE(Dave_Darling @ Dec 14 2017, 08:22 PM) *

The 75 cap would have been different. The 73 cap would have been like this--but someone painted this one.

I believe there is a seal on the underside of the cap; it can fail after a few decades.

Double-check your charcoal canister lines. If they are unplugged they can lead to a gas smell.

I think there is a gasket between the fuel filler neck assembly and the tank. A leak there might possibly give you a fuel smell too.

The tank often rusts where it rests on the shell of the car--there are felt pads that can trap moisture and lead to pinholes.

--DD

And a third seal under the fuel tank sender. Also make sure the large clear overflow line exits out from under the car.
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98101
post Dec 14 2017, 07:55 PM
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QUOTE(mepstein @ Dec 14 2017, 05:39 PM) *

And a third seal under the fuel tank sender. Also make sure the large clear overflow line exits out from under the car.


Dave, 76, and mepstein, thank you for the help!

Is the large clear overflow line supposed to attach here?
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Larmo63
post Dec 14 2017, 07:58 PM
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There is a braided hose that goes there and onto the evaporator, then onto the charcoal canister.

(If I remember correctly)
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Olympic 914
post Dec 14 2017, 08:31 PM
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If you have the evaporator tank the braided hose goes where the green arrows are, and then from the other side of the evaporator tank to the charcoal canister.

Your gas smell is most likely coming from that open vent. Could also be a bad gasket though.

The big clear hose goes where the red arrow is. this is for when you spill gas filling the tank and it drains onto the ground. ( is that legal in Kalifornia?)

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GeorgeRud
post Dec 14 2017, 10:26 PM
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Mikey914 has a nice rubber replacement for the original leather gasket on the gas cap.
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Olympic 914
post Dec 15 2017, 07:16 AM
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QUOTE(GeorgeRud @ Dec 14 2017, 11:26 PM) *

Mikey914 has a nice rubber replacement for the original leather gasket on the gas cap.


I had two of those split. ended up making one from a thick piece of cork gasket material. that has been working so far.
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mgphoto
post Dec 15 2017, 08:49 AM
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QUOTE(98101 @ Dec 14 2017, 05:55 PM) *

QUOTE(mepstein @ Dec 14 2017, 05:39 PM) *

And a third seal under the fuel tank sender. Also make sure the large clear overflow line exits out from under the car.


Dave, 76, and mepstein, thank you for the help!

Is the large clear overflow line supposed to attach here?
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There should be a small cloth cover rubber line from the nipple on the filler going to the charcoal filter on top of the fuel tank.
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rhodyguy
post Dec 15 2017, 09:11 AM
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As you may not have the charcoal canister installed, cap the small nipple wth a piece of line and a plug of some sort. A small shouldered bolt should suffice. The nipple as pictured is a open window for gas fumes.
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mepstein
post Dec 15 2017, 09:12 AM
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QUOTE(mgphoto @ Dec 15 2017, 09:49 AM) *

QUOTE(98101 @ Dec 14 2017, 05:55 PM) *

QUOTE(mepstein @ Dec 14 2017, 05:39 PM) *

And a third seal under the fuel tank sender. Also make sure the large clear overflow line exits out from under the car.


Dave, 76, and mepstein, thank you for the help!

Is the large clear overflow line supposed to attach here?
Attached Image

There should be a small cloth cover rubber line from the nipple on the filler going to the charcoal filter on top of the fuel tank.

(IMG:style_emoticons/default/agree.gif) it’s about 4mm x 12” but actually goes to the expansion tank that sits on the gas tank. Then a short ~ 7mm x 12” line from expansion tank to charcoal filter.
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mgphoto
post Dec 15 2017, 09:31 AM
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QUOTE(mepstein @ Dec 15 2017, 07:12 AM) *

QUOTE(mgphoto @ Dec 15 2017, 09:49 AM) *

QUOTE(98101 @ Dec 14 2017, 05:55 PM) *

QUOTE(mepstein @ Dec 14 2017, 05:39 PM) *

And a third seal under the fuel tank sender. Also make sure the large clear overflow line exits out from under the car.


Dave, 76, and mepstein, thank you for the help!

Is the large clear overflow line supposed to attach here?
Attached Image

There should be a small cloth cover rubber line from the nipple on the filler going to the charcoal filter on top of the fuel tank.

(IMG:style_emoticons/default/agree.gif) it’s about 4mm x 12” but actually goes to the expansion tank that sits on the gas tank. Then a short ~ 7mm x 12” line from expansion tank to charcoal filter.



Your right, my bad, from the expansion tank to to charcoal filter.
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98101
post Dec 15 2017, 05:32 PM
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Michael in Seattle
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I appreciate everyone's patience with my newbie learning process.

I now realize that not only am I missing the charcoal canister, I'm missing the expansion tank!

How would you proceed if you were me? A part of me wants to restore the whole system, but I don't know if the charcoal canister would function without the original connection to the air cleaner, and my car has carbs.

Another mystery is why I wasn't smelling any gasoline until the first time I refueled.

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98101
post Dec 15 2017, 07:27 PM
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Michael in Seattle
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For now I attached some 5/32" hose with this nylon fitting and a brass cap ... best we could figure out at the hardware store.

Any advice on what to do next is appreciated. Is there any point to having the expansion tank without the charcoal canister? Or both of those without a hose to ventilate into the engine intake?

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Steve
post Dec 16 2017, 12:33 AM
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Gas vapors have to go somewhere, probably not wise to cap it off, you will probably blow out a gasket somewhere else. I would run that hose out the bottom of the car until you get the charcoal canister and any other missing parts.
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bandjoey
post Dec 16 2017, 07:10 AM
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Seattle doesn't get as hot as Texas but you still need an expansion tank as noted above. Running carbs, the line from the exp tank goes to the charcoal filter and then out the bottom of the car. No fumes ever.
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98101
post Dec 16 2017, 10:43 AM
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Thank you. I see why capping the vapors might be a bad idea.

I found Auto Atlanta has the expansion tank:
http://www.autoatlanta.com/Porsche-914-Fue...1420105510.html

and 914 Rubber has this gasket:
http://shop.914rubber.com/914-Expansion-Ta...ket-914EXTG.htm

I'm guessing I should start with those parts at a minimum as I look for the charcoal canister and hoses? I've also sent an inquiry to Pelican.
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mepstein
post Dec 16 2017, 11:29 AM
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You can get the parts (expansion tank, charcoal filter) much cheaper from guys like bedstone/Bruce stone or Garold on this site.
I just purchased a gas cap gasket from 914rubber. Great vendor.
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bandjoey
post Dec 16 2017, 02:54 PM
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half dozen on ebay from $30-50. and post a classified here and you'll get one quick i expect.
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