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Re: [GMCnet] In tank fuel pumps, or external pumps. [message #316377 is a reply to message #316363]

Fri, 21 April 2017 09:42

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma:

Senior Member

To get 87 octane gas to boil. You need temps that are approaching 200 degrees. Those are temps that you can't touch. I've had an electric fuel pump near my tanks fail on a day when the temp was near 100. The tank, pump, and frame were no were near that. Maybe 125 at most. That day I was pulling my enclosed trailer. GVW was at about 21,000 lbs. Anyone in the Southwest. Check the temps on days like that. Gas just can't boil back there. Even on a hot day.

A hole in the floor is fine if you have carpet. But a vinyl, or other hard surfaces to me is an other subject. In our burned 78 GMC. I had the electric pump just at the front of the tanks. I never had vapor lock. Even being in Arizona during a hot week in July. With my tanks being at 115 degrees. And with the amount of gas coming out of those tanks to cool those gas lines. Apparently gas got to my carb before the gas got to a temp to create a vapor lock condition. So I just don't see how moving the pumps just outside the tanks can help reduce vapor lock to any measureable degree. That 115 degree gas might hit the external pumps at 118 degrees. That's along way from vapor lock temps. I don't see in tank pump as a bad idea. I just would like to find a reason to justify the extra work for me. Bob Dunahugh

Both ways have their own good, and bad points. Pulling tanks isn't a real big deal. It's the getting the GMC high enough to do it. And if your on the road. That really gets more complicated. I'm going to put in 1 pump per tank. One way, or the other. And take the tank selector valve out. So since I'm thinking of external pumps mostly for simply of installation, and access for repair. What's the advantages of the in tank installation? Bob Dunahugh 78 Royale
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[Message index]

		[GMCnet] In tank fuel pumps, or external pumps. By: BobDunahugh on Wed, 19 April 2017 22:36
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: USAussie on Wed, 19 April 2017 22:41
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: A Hamilto on Wed, 19 April 2017 23:19
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: Ken Burton on Thu, 20 April 2017 00:14
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: A Hamilto on Thu, 20 April 2017 16:49
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: Glenn on Thu, 20 April 2017 17:17
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: kerry pinkerton on Thu, 20 April 2017 18:38
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: Ken Burton on Thu, 20 April 2017 22:20
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: Chris Tyler on Fri, 21 April 2017 13:10
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: Emery Stora on Fri, 21 April 2017 13:31
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: USAussie on Fri, 21 April 2017 15:15
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: BobDunahugh on Fri, 21 April 2017 00:24
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: USAussie on Fri, 21 April 2017 05:32
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: kstockwell on Fri, 21 April 2017 06:27
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: lqqkatjon on Fri, 21 April 2017 08:02
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: BobDunahugh on Fri, 21 April 2017 09:42
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: emerystora on Fri, 21 April 2017 10:21
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: emerystora on Fri, 21 April 2017 10:30
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: Matt Colie on Fri, 21 April 2017 10:32
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: James Hupy on Fri, 21 April 2017 10:29
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: A Hamilto on Fri, 21 April 2017 13:57
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: Larry on Fri, 21 April 2017 08:28
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: James Hupy on Fri, 21 April 2017 09:22
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: jimk on Fri, 21 April 2017 09:35
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: k2gkk on Fri, 21 April 2017 11:00
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: James Hupy on Fri, 21 April 2017 11:04
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: Larry on Fri, 21 April 2017 13:24
		Re: [GMCnet] In tank fuel pumps, or external pumps. By: kerry pinkerton on Fri, 21 April 2017 13:58

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