Re: 1973 chevy pickup v8/350 Rochester quad carb

knitey wrote:

Mike Romain wrote:
You sure could be describing a pinhole leak on the suction side of the
fuel pump. A small leak will suck air into the line and empty it when
it sits so it is a bugger to cold start. As it gets worse it can air
lock the line.

Depending on where the leak is, all you might see is a stain on the
metal line where it clamps to the frame rail or a stain on a small crack
in one of the rubber lines at the end of the steel tube. Lots of times
these suction leaks don't drip on the ground.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
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knitey wrote:

I bought this truck for my 13 year old to learn about engines. When we
got the truck, it would start if you primed the carb, run for awhile
and die. So far, we have:
Rebuilt the carb
Replaced plugs and wires
dist. cap and rotar
points
oil/filter
fuel pump
put in an inline fuel filter
timing looks good

Now the truck will eventually start. Seems it takes awhile to get gas
from the tank to the carb. Then it will run pretty good in park or
neutral, and can rev pretty good. I can see gas going through the
inline fuel filter.

I have taken the truck for approx. 1/2 mile ride, then it dies.
Problem seems to be when truck is moving and gas is sloshing around.
Right now I only have 1/8th of tank while I'm playing with it. I
really didn't want to put more in, in case I had to drop the tank.
When truck dies, I don't see any gas going through the inline fuel
filter. Like it can't get it out of the tank. I took the gas cap off
in case the gas cap was causing a vacuum. That didn't help.
Any ideas?

I ran the fuel pump off a 10foot section of
hose from inside the cab. I had the windows open and fire
extinguisher...just in case. Within a few seconds the fuel filter was
totally full of fuel, instead of about 1/4 full. Ran the truck up and
down some hills for 10 minutes and everything worked great. Seems
problem is in the fuel line, or tank.

Before I drop the tank, could I hook my air compressor up to the fuel
line and blow air through it to see if it helps? Also, can I do
anything with the hose that goes inside the tank? Replace it or
something? It seems lodged pretty well into the tank. I was afraid to

move it around too much. Anything I can do there?

Really appreciate all your help.

If you have a plugged up sock in the tank, you can 'sometimes' blow them
out with compressed air. You also can blow the sock off... If you keep
the air low, you might be able to hear the leak if it's in the line. I
have always been able to see the stain though, it is usually obvious.

On my 75 Chevy pickup I could blow through the gas line up near the pump
to clear my sock in the tank. I just used lung power. Had a lot of
crap in the tank, it worked.

Back at the tank the gauge sender unit has the tube and sock attached as
well as the return line if any. They are hard copper nipples you put
the rubber line on to. If you have 2 lines coming out of the top of the
tank side by side, the larger one is the gas line, the smaller one would
be a return line if you have it.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
(More Off Road album links at bottom of the view page)
.

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