 WONT START, 100degrees outside |
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| Ebradley |
 Aug 17 2020, 03:31 PM
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#1
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Newbie  Group: Members Posts: 45 Joined: 16-April 20 From: California Member No.: 24,142 Region Association: Southern California  |
Hi
I’ve owned my 74 Porsche 2.0 for four months now. I’m 3rd owner and has 100k original miles. Yesterday, I drove it to grab take out food and it was 100degrees outside. After I parked and grabbed food, wouldn’t start. Eventually started then stalled a few times as I pulled up to a traffic stoplight. Any ideas? Vapor lock? Thanks |
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| thelogo |
Aug 17 2020, 06:35 PM
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#2
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Senior Member Group: Retired Members Posts: 1,510 Joined: 6-April 10 Member No.: 11,572 Region Association: None |
QUOTE(Ebradley @ Aug 17 2020, 02:31 PM)  Hi I’ve owned my 74 Porsche 2.0 for four months now. I’m 3rd owner and has 100k original miles. Yesterday, I drove it to grab take out food and it was 100degrees outside. After I parked and grabbed food, wouldn’t start. Eventually started then stalled a few times as I pulled up to a traffic stoplight. Any ideas? Vapor lock? Thanks Sorry man but yeh i got an idea . if you happen to own a watercooled car . which dissapates heat exponentially faster . on a 100deg day. Drive it to grab food not the teener. But i have done it myself and same thing and you're fuel pump was most likely scalding hot . too hot . thats all But bring a bag of ice next time? And is youre car blue ? .... With black interior . cause that sound like it would be hot |
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| ClayPerrine |
Aug 17 2020, 07:30 PM
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#3
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Life's been good to me so far..... Group: Admin Posts: 15,524 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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QUOTE(Ebradley @ Aug 17 2020, 04:31 PM) Hi I’ve owned my 74 Porsche 2.0 for four months now. I’m 3rd owner and has 100k original miles. Yesterday, I drove it to grab take out food and it was 100degrees outside. After I parked and grabbed food, wouldn’t start. Eventually started then stalled a few times as I pulled up to a traffic stoplight. Any ideas? Vapor lock? Thanks Did the fuel pump get re-located up front? If not, you probably have vapor lock. It is almost mandatory to move it up front if you live in Texas and want to actually use the car in the summer. If you relocate the pump, I would also suggest that you put in a set of stainless steel fuel lines from Tangerine racing. The plastic lines are almost 50 years old now, and are getting brittle from engine compartment heat. Better safe than on fire. Clay |
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| DickSteinkamp |
Aug 17 2020, 07:33 PM
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#4
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Senior Member Group: Members Posts: 500 Joined: 27-February 17 From: Bellingham, WA Member No.: 20,876 Region Association: None |
Is it possible to get vapor lock with FI? Seems like since the pump is always returning the majority of what it gets from the tank to the tank that vapor lock would be tough.
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| ClayPerrine |
Aug 17 2020, 07:36 PM
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#5
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Life's been good to me so far..... Group: Admin Posts: 15,524 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(DickSteinkamp @ Aug 17 2020, 08:33 PM) Is it possible to get vapor lock with FI? Seems like since the pump is always returning the majority of what it gets from the tank to the tank that vapor lock would be tough. Yes, it is not only possible, it happens on a regular basis. The fuel pump was not positioned well for a hot climate. They fixed it in 75 when the moved the pump up front. |
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| saigon71 |
Aug 18 2020, 05:13 AM
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#6
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Advanced Member Group: Members Posts: 2,000 Joined: 1-June 09 From: Dillsburg, PA Member No.: 10,428 Region Association: MidAtlantic Region 
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QUOTE(ClayPerrine @ Aug 17 2020, 09:36 PM) QUOTE(DickSteinkamp @ Aug 17 2020, 08:33 PM) Is it possible to get vapor lock with FI? Seems like since the pump is always returning the majority of what it gets from the tank to the tank that vapor lock would be tough. Yes, it is not only possible, it happens on a regular basis. The fuel pump was not positioned well for a hot climate. They fixed it in 75 when the moved the pump up front. (IMG:style_emoticons/default/agree.gif) It's real and it sucks. (IMG:style_emoticons/default/headbang.gif) I battled this problem for several years before moving the fuel pump up front. Hasn't happened since. |
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| carlsol |
Aug 18 2020, 08:16 AM
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#7
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Newbie Group: Members Posts: 12 Joined: 3-January 15 From: Raymond, NE Member No.: 18,283 Region Association: Upper MidWest |
Yep, relocate the fuel pump.
I had the same problem with my 73 2.0, i.e., would not start again after a drive even on days considerably cooler than 100 degrees. Fuel pump was moved to the front, never had that problem again. |
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| dr914@autoatlanta.com |
Aug 18 2020, 08:45 AM
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#8
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914 Guru Group: Members Posts: 7,898 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
yup sounds like it.
QUOTE(Ebradley @ Aug 17 2020, 02:31 PM) Hi I’ve owned my 74 Porsche 2.0 for four months now. I’m 3rd owner and has 100k original miles. Yesterday, I drove it to grab take out food and it was 100degrees outside. After I parked and grabbed food, wouldn’t start. Eventually started then stalled a few times as I pulled up to a traffic stoplight. Any ideas? Vapor lock? Thanks |
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| Ebradley |
Aug 18 2020, 05:56 PM
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#9
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Newbie Group: Members Posts: 45 Joined: 16-April 20 From: California Member No.: 24,142 Region Association: Southern California |
Thanks for the advice everyone
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