Sounds an awful lot like vapor lock. Somewhere between the tank and the
fuel pump the gas is getting hot enough to boil and the pump looses its
prime. To do it in 3-5 minutes, I would look for somewhere where the fuel
line is real close to the exhaust.
Could also be:
Stuck float valve in the carburator.
Blocked or kinked fuel line.
Blocked jet in the carb.
Choke sticking on?
Stuck heat riser valve that heats the carb too hot.
Did you put the spacer between the carb and the manifold? It insulates the
carb.
Water in the gas? Try a can of Heet. Had that problem last weekend, would
die when the truck was pitched forward on a hill and the pipe sucked water.
Don't rule out electrical. Something heats up and opens circuit. Point
spring has lost its temper. Coil is borderline. Only way to tell for sure
is to confirm spark imediately after it has died.
Good luck.
Bruce Kettunen
57 3200
Mt. Iron, MN
>Guys I installed a Chevy 305 in my 56 truck. I installed a rebuilt
>carbuerator. I only have about 10 miles on the rebuilt engine/truck.
>Initially it ran fine but now it runs for about 3-5 minutes sputters then
>dies. It cranks fine but won't start. Seems to be getting spark but no
>fuel. Installed a brand new fuel filter with the engine rebuild. After
>sitting for 15-20 minutes it will start again but will die again in 3-5
>minutes.
>
>The engine is turned. Full tank of fresh gasoline.
>
>I'm stumped and really frustrated. Any ideas?
>
>Thanks a lot.
>
>Mike
>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
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