| [GMCnet] In tank fuel temperatures [message #242996] |
Tue, 11 March 2014 00:30  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
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Senior Member |
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G'day,
I just provided a link to Chuck Garton's three fuel tank installations. I hadn't read this article in a LONG time! I discovered that
Chuck has temperature probes in all three of the tanks and here's what he notes regarding the temps he has seen:
http://www.gmcpc.org/archive/3rd_fuel_tank.pdf
Quote #1
I mounted the fuel pumps (again, one for each tank) outside of frame rails (picture 13). By mounting them this way, I was able to
get each pump closer to its tank (electric fuel pumps are better pushers than pullers). Also on 100°+ days the area outside the
frame rails is about 25° cooler than the fuel in the front tank.
Quote #2
Picture 14 shows the fuel tank temperature sensor installed. All three tanks have temperature sensors. When a fuel tank is selected
to pump from, the temperature sensor for that tank is also selected. The hottest temperature observed was 148° F in August 2005 on
I-15’s sixteen-mile climb just north of Baker, CA on the way to Las Vegas.
Quote #3
Last summer, during a trip to the east coast, I experienced vapor lock problems when forced to idle on 100°+ days for more than
three minutes. When I returned home, I abandoned the stock steel fuel line that ran inside the frame around the engine and ran a new
steel line outside the frame. When I finished this task, it was 105° in Ridgecrest and I drove to a large empty black asphalt
parking lot and idled for thirty minutes with no vapor lock problems.
Comments:
Quote #1 - I am of the opinion that this demonstrates that the tanks pickup heat from hot air flowing rearward from the engine and
radiated from the roadway.
Quote #2 - ONE HUNDRED AND FORTY EIGHT DEGREES! Holy crap!
Quote #3 - This is very interesting it might just be the main cause of vapor lock in OEM GMC's
I am going to send Chuck an off net email and ask him if he can provide some additional data.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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