Is this the right gas cap?, seems to leak |
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Is this the right gas cap?, seems to leak |
98101 |
Dec 14 2017, 07:06 PM
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#1
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Michael in Seattle Group: Members Posts: 373 Joined: 7-October 17 From: Seattle, WA Member No.: 21,495 Region Association: Pacific Northwest |
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 |
Dec 14 2017, 07:22 PM
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#2
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914 Idiot Group: Members Posts: 14,974 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
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 |
76-914 |
Dec 14 2017, 07:23 PM
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#3
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,453 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
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 |
Dec 14 2017, 07:39 PM
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#4
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914-6 GT in waiting Group: Members Posts: 19,142 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
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. |
98101 |
Dec 14 2017, 07:55 PM
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#5
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Michael in Seattle Group: Members Posts: 373 Joined: 7-October 17 From: Seattle, WA Member No.: 21,495 Region Association: Pacific Northwest |
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Larmo63 |
Dec 14 2017, 07:58 PM
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#6
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Advanced Member Group: Members Posts: 4,264 Joined: 3-March 14 From: San Clemente, Ca Member No.: 17,068 Region Association: Southern California |
There is a braided hose that goes there and onto the evaporator, then onto the charcoal canister.
(If I remember correctly) |
Olympic 914 |
Dec 14 2017, 08:31 PM
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#7
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Group: Members Posts: 1,658 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States |
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?) |
GeorgeRud |
Dec 14 2017, 10:26 PM
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#8
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
Mikey914 has a nice rubber replacement for the original leather gasket on the gas cap.
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Olympic 914 |
Dec 15 2017, 07:16 AM
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#9
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Group: Members Posts: 1,658 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States |
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mgphoto |
Dec 15 2017, 08:49 AM
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#10
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"If there is a mistake it will find me" Group: Members Posts: 1,330 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
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? 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. |
rhodyguy |
Dec 15 2017, 09:11 AM
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#11
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,042 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
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 |
Dec 15 2017, 09:12 AM
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#12
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914-6 GT in waiting Group: Members Posts: 19,142 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
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? 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. |
mgphoto |
Dec 15 2017, 09:31 AM
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#13
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"If there is a mistake it will find me" Group: Members Posts: 1,330 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
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? 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. |
98101 |
Dec 15 2017, 05:32 PM
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#14
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Michael in Seattle Group: Members Posts: 373 Joined: 7-October 17 From: Seattle, WA Member No.: 21,495 Region Association: Pacific Northwest |
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. |
98101 |
Dec 15 2017, 07:27 PM
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#15
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Michael in Seattle Group: Members Posts: 373 Joined: 7-October 17 From: Seattle, WA Member No.: 21,495 Region Association: Pacific Northwest |
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? |
Steve |
Dec 16 2017, 12:33 AM
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#16
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914 Guru Group: Members Posts: 5,545 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California |
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 |
Dec 16 2017, 07:10 AM
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#17
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bandjoey Group: Members Posts: 4,920 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
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 |
Dec 16 2017, 10:43 AM
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#18
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Michael in Seattle Group: Members Posts: 373 Joined: 7-October 17 From: Seattle, WA Member No.: 21,495 Region Association: Pacific Northwest |
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. |
mepstein |
Dec 16 2017, 11:29 AM
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#19
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914-6 GT in waiting Group: Members Posts: 19,142 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
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. |
bandjoey |
Dec 16 2017, 02:54 PM
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#20
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bandjoey Group: Members Posts: 4,920 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
half dozen on ebay from $30-50. and post a classified here and you'll get one quick i expect.
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