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[GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking [message #99782]

Tue, 14 September 2010 17:43

Gary Casey

Messages: 448
Registered: September 2009

Karma:

Senior Member

I've read dozens of posts on vapor lock, the cause and the cure. My(previous)
thoughts: They must have been halfway smart back in the ole days of the GMC, so
stop complaining, just fix everything, put it back to stock and it will work.
Thoughts were wrong. I did that and headed out on the first trip. Lots of
vapor lock symptoms and very consistent. I checked everything I could and
replaced everything that has a moving part, all to no avail. So as a last ditch
effort I put an electric pump in the feed line from the rear tank, pumping
through the selector valve and powered in parallel to it. In that way the front
tank was fed exactly as standard so it was a good baseline. Went out today for
a test drive up and down some hills, elevation 6000 to 7000 feet. Got it hot,
pulled off to the side and let it idle for 2 minutes in drive. Accelerate out
and it would sag and almost die before getting to 20 mph. Turn on the pump and
it would stumble for a few seconds and off we go. Pull off again (electric pump
off) for longer and the idle speed would gradually drop, and then it would
hardly take Throttle at all. Turned on the electric pump and I could idle for 5
minutes with no variation in idle speed and it would accelerate away without
problem. Duplicated all the tests while running the electric pump and no
symptoms at all. I'm convinced. It's the ethanol. The only (okay, one of the
only) rational fuel system, I'm convinced, is one that was suggested some time
back: Throw away the fuel selector and mechanical pump install an electric pump
on the outlet of each tank with the outputs T'd together. No need for a valve
since the pumps have internal check valves. Install an oil pressure switch to
shut them off if the engine quits and then bypass that during cranking by
connecting to the starter solenoid terminal. A selector switch is used to
change tanks. Yes, they were smart back then, but they didn't have this fuel to
contend with.
Several people reported that they run premium fuel, look for the ethanol sticker
on the pump, find a no-ethanol source, etc. I just felt that approach to be not
reliable enough when on the road, so I think the fuel system has to work with
the fuel we have.
Just my opinion.
Gary Casey

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[Message index]

		[GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Gary Casey on Tue, 14 September 2010 17:43
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: roy1 on Tue, 14 September 2010 19:30
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Gary Casey on Wed, 15 September 2010 07:01
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Jim Bounds on Wed, 15 September 2010 07:24
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Ken Henderson on Wed, 15 September 2010 07:24
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Tom Fort on Wed, 15 September 2010 08:59
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: cbwoodsr on Wed, 15 September 2010 09:37
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: jimk on Wed, 15 September 2010 09:49
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Gary Casey on Wed, 15 September 2010 09:35
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: USAussie on Wed, 15 September 2010 14:16
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: RF_Burns on Wed, 15 September 2010 11:58
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: USAussie on Wed, 15 September 2010 14:16
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Larry C on Wed, 15 September 2010 16:57
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Gary Casey on Wed, 15 September 2010 19:32
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: GeorgeRud on Wed, 15 September 2010 22:51
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Dr. Detroit on Thu, 16 September 2010 08:07
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: emerystora on Thu, 16 September 2010 09:00
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Gary Casey on Thu, 16 September 2010 11:29
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: emerystora on Thu, 16 September 2010 12:02
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Dr. Detroit on Thu, 16 September 2010 17:16
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Larry C on Thu, 16 September 2010 18:46
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Dr. Detroit on Thu, 16 September 2010 19:13
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Ken Henderson on Thu, 16 September 2010 21:00
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: WD0AFQ on Thu, 16 September 2010 22:11
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Gary Casey on Fri, 17 September 2010 16:29
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Dr. Detroit on Fri, 17 September 2010 21:12
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: gmcrv1 on Fri, 17 September 2010 23:02
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: gmcrv1 on Fri, 17 September 2010 23:08
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Dr. Detroit on Sat, 18 September 2010 06:04
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: gmcrv1 on Sat, 18 September 2010 06:56
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: USAussie on Sat, 18 September 2010 08:14
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: emerystora on Sat, 18 September 2010 09:21
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: gmcrv1 on Sat, 18 September 2010 12:18
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Larry C on Sun, 19 September 2010 15:33
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Dr. Detroit on Sat, 18 September 2010 09:34
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Matt Colie on Sat, 18 September 2010 09:36
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Gary Casey on Sat, 18 September 2010 11:33
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: emerystora on Sat, 18 September 2010 12:58
		Re: [GMCnet] Vapor lock - lost the battle but not the war, or: Ethanol is for drinking By: Gary Casey on Sat, 18 September 2010 11:37

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