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Re: Vaporlock baseline temperatures [message #211307 is a reply to message #211128]

Sun, 16 June 2013 20:01

wally

Messages: 643
Registered: August 2004
Location: Omaha Nebraska

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Senior Member

rcjordan wrote on Sat, 15 June 2013 06:15

Has anyone started collecting data on temps during vaporlock episodes? I'm thinking that ambient, undercarriage, tank walls (forward & rear edges), fuel line, and other points would give us some much-needed feedback.

Having recently experienced the beginnings of vapor lock I've been researching what gasoline vapor pressure might be at elevated temperatures. It seems the epa standard, Reid vapor pressure can be used to figure what the pressure might be at other temperatures. Found the following nomographs in the epa's tank regs.
For refined petroleum
http://www.gmcmhphotos.com/photos/data/6399/RVP_refined.pdf
For crude
http://www.gmcmhphotos.com/photos/data/6399/RVP_Crude.pdf
Interestingly they are about the same. Gasoline is probably right in there too.
Nomographs came from
http://www.epa.gov/ttnchie1/ap42/ch07/final/c07s01.pdf
I read that summer blend can now have a 10 psi RVP if it has ethanol in it.
http://www.epa.gov/otaq/fuels/gasolinefuels/volatility/regulations.htm
At sea level and 120 F the vapor pressures about equals atmospheric so no wonder any negative pressure gives us problems.In tank pumps is the direction I'm going. Never had any problems with Carter 4070's as pusher pumps before this year.

Wally Anderson
Omaha NE
75 Glenbrook

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[Message index]

		Vaporlock baseline temperatures By: rcjordan on Sat, 15 June 2013 06:15
		Re: [GMCnet] Vaporlock baseline temperatures By: USAussie on Sat, 15 June 2013 08:33
		Re: Vaporlock baseline temperatures By: rcjordan on Sat, 15 June 2013 08:52
		Re: [GMCnet] Vaporlock baseline temperatures By: USAussie on Sat, 15 June 2013 18:40
		Re: Vaporlock baseline temperatures By: armandminnie on Sat, 15 June 2013 18:15
		Re: Vaporlock baseline temperatures By: rcjordan on Sat, 15 June 2013 19:40
		Re: Vaporlock baseline temperatures By: Bill Freeman on Sun, 16 June 2013 07:17
		Re: [GMCnet] Vaporlock baseline temperatures By: USAussie on Thu, 20 June 2013 13:40
		Re: Vaporlock baseline temperatures By: rcjordan on Sun, 16 June 2013 11:50
		Re: Vaporlock baseline temperatures By: wally on Sun, 16 June 2013 20:01
		Re: Vaporlock baseline temperatures By: winter on Mon, 17 June 2013 20:33
		Re: Vaporlock baseline temperatures By: rcjordan on Thu, 20 June 2013 14:05
		Re: Vaporlock baseline temperatures By: Michael Morton on Thu, 20 June 2013 16:36
		Re: [GMCnet] Vaporlock baseline temperatures By: USAussie on Thu, 20 June 2013 17:41
		Re: [GMCnet] Vaporlock baseline temperatures By: gbarrow2 on Thu, 20 June 2013 18:31
		Re: Vaporlock baseline temperatures By: Keith V on Thu, 20 June 2013 17:54
		Re: Vaporlock baseline temperatures By: George Beckman on Thu, 20 June 2013 18:58
		Re: [GMCnet] Vaporlock baseline temperatures By: Ronald Pottol on Thu, 20 June 2013 19:00
		Re: [GMCnet] Vaporlock baseline temperatures By: Jim Bounds on Fri, 21 June 2013 06:12
		Re: [GMCnet] Vaporlock baseline temperatures By: Carl S. on Fri, 21 June 2013 09:46
		Re: Vaporlock baseline temperatures By: bobby5832708 on Thu, 20 June 2013 19:23
		Re: Vaporlock baseline temperatures By: Michael Morton on Fri, 21 June 2013 06:37
		Re: [GMCnet] Vaporlock baseline temperatures By: USAussie on Fri, 21 June 2013 09:13
		Re: [GMCnet] Vaporlock baseline temperatures By: GMC_LES on Fri, 21 June 2013 12:16
		Re: Vaporlock baseline temperatures By: Michael Morton on Fri, 21 June 2013 18:11

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