I had a similar problem with my 216 and boiled-out gas tank. It wasn't
however, temperature related. I'm assuming your gas tank is under the bed
like my '48. The pick-up tube runs at an angle from about 1/2 way up the
front of the tank. When I first got mine running again it would run for just
a few seconds and quit. Trouble ended up being hole(s) in the pick-up tube.
It would pump enough gas to start (or from gas I primed the intake with) but
This doesn't fully explain why your problem is intermittant unless you are
close to 1/2 full and the level is dropping below a hole in the pick-up tube
Anyway, I'd check it out with a full tank of gas. My solution was to fab a
pick-up for the drain hole - took a fitting and braised a short 1/4" or so
tube so I wouldn't be pumping off the very bottom of the tank. (The pick-up
tube comes a little off the bottom anyway)
48 Chevy 3/4 ton "Rack"
In a message dated 7/26/2000 10:54:23 AM Eastern Daylight Time,
<< Yesterday afternoon I experienced what I assume was vapor lock.
The wife and I drove approximately 25 miles on the freeway (60-65 mph),
and as soon as we got off on the side streets and slowed down the engine
quit. After it sat for a couple of minutes it fired back up, then would
die again after a couple of minutes. We finally got to where we were
going, it sat a couple of hours, and we were able to drive home with no
problem. This morning after driving approximately 5 miles it did it
The temps yesterday afternoon were in the mid to upper 90's, with the
humidity being somewhere in the 65-70% range. Last night on the return
trip the temps were in the low 80's, as they were this morning when it
happened again. I'm running a stock 216, and the truck has just recently
been completely (frame off) restored. The fuel tank was vatted and
sealed, I have 2 inline filters, and the fuel lines are run where they
What do ya'll think; does this sound like vapor lock, and if so, is
there a sure fire way to prevent it from happening again? My neighbor
tells me that when it gets hot (a constant here in Texas), that vapor
lock pretty much becomes a common occurrence on these old trucks when
speed is mixed with heat and humidity. Does that sound right?
Thanks for any help.
49 3100 Deluxe
24 1 ton
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