Home » Public Forums » GMCnet » Vaporlock baseline temperatures
| Re: [GMCnet] Vaporlock baseline temperatures [message #211721 is a reply to message #211715] |
Thu, 20 June 2013 17:41   |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
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Senior Member |
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Mike,
I must have missed this info earlier and would like a bit of additional information as it is an interesting approach.
1) Instead of tapping into the carb filter housing do you believe a "T" at the inlet would suffice?
2) How did you install a fitting in the fuel filler neck?
3) What material is the line that goes from the carb inlet filter to the fuel filler neck
4) Where is your electric fuel pump located?
1. Physically?
2. In the fuel flow path?
5) I assume you have removed the mechanical fuel pump?
6) Have you operated the GMC equipped with this system at high altitudes (Eisenhower Pass) through the Rockies and at high summer at
high temps?
Regards,
Rob M.
-----Original Message-----
From: Michael Morton
Guys, I just can't believe that everyone keeps trying to over engineer this vapor lock problem. I have posted a couple times how I
cured my problem and been told it wouldn’t work. After rebuilding, restoring, and racing many different things for the last 40
years, I believe in the KISS principle. (keep it simple stupid). I started racing dirt bikes, moved into go carts, drag cars, road
race cars, have build 2 motorcycles that hold land speed records. But my first love is airplanes. I am a licensed aircraft and power
plant mechanic and an airline captain. I have raced an airplane at Reno, flown airshows in several different aerobatic aircraft and
presently maintain several war birds that I fly at shows. My main hobby is restoring antique aircraft, just finished rebuilding the
300hp engine on my airshow aircraft. Lost count of how many aircraft engines I have rebuilt over the years. I'm just saying this to
show that I am no dummy when it comes to mechanical things. I read about coolers, tank insulation, in tank pumps, and many more
ideas. All that is required is a simple fuel return line. Just tap and install a fitting in the top of the fuel filter housing at
the carb, install another one in the fuel filler neck, located in the engine compartment under the drivers seat and connect the two
with a 1/4 inch line. I did this 2 years ago and haven't have a hint of vapor lock problem since. Now I just use my electric fuel
pump to fill the carb after a long sit to make it start easier. With the fuel constantly flowing there is little chance for vapor
lock and if vapor does form it is routed back to the fuel tank. I did say to install the fitting on the top of the fuel filter
housing, didn't I? This maintains reliable fuel to the carb bowl. Most carburated and fuel injected aircraft use a fuel return to
combat vapor lock. All the cars I own I have bought salvage and rebuilt so I know them inside and out, my BMW, and Ford F150 with
fuel injection use fuel returns, hell even my carburated 1985 Jeep CJ7, and 1966 AC Cobra use a fuel return. Just keep it simple,
install a fuel return and enjoy your ride. After all, we are dealing with a motor home built in the 70s using 50s technology, it's
not rocket science.
Sorry to toot my horn, but this is not my first rodeo.
Mike
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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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