Do you have the thick insulator installed under your carb?
Even so I would suspect a restriction over the vapor lock theory. In
particular I would be leery of inline filters that you can't see through.
Assume you replaced the fuel lines with new ones? I have had them plug up on
low point or the horizontal run with a gummy substance. Blowing them out can
be a temporary fix or false indication they are clear only to have it plug
I too like the glass bowl pump and follow that up with the clear bowl
pumice type filter just before the carb. You can tell what's going on with a
glance and clean them easily.
Good luck and let us know when you find out what it is. I know those
intermittent problems can be frustrating and a bear to track down.
50 Chevy 3100
52 GMC 150
Brad Newman wrote:
> 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
> were originally.
> 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.
> Brad Newman
> 49 3100 Deluxe
> 24 1 ton
> Coppell, Texas
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959