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Original Message
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| Sounds like ethanol in the gas, to me. |
| By Dave Shoe - 12/22/2003 5:58:38 PM; IP 12.2.11.190 |
I'm not an authority on the topic, but I have an attitude and opinion to offer. It may be wrong, but:
The problem is carburetor heat soak. The carb and intake is normally cooled by the incoming air charge and fresh flowing fuel. If you turn it off for a period of time ranging from a couple minutes to an hour or so (depends on the weather), the intake manifold will tend to heat up very hot due to the exhaust crossover porting, and soon the carb will heat up quite a bit. This allows the more volatile parts of gasoline to boil. Nowadays, that usually means any ethanol in the gas has boiled, causing the carb, maybe even the fuel pump, to vapor lock.
If it was only the fuel pump, however, I don't believe there would be a starting problem. Instead I believe a hot engine would start easy but would tend to stall after a few seconds. For this reason, I focus on carburetor issues.
I securely block off the exhaust crossover in my intake to help prevent most occurances of this problem. Dunno if it really helps, but it sure seems to be effective. Note that wimpy blockage of the crossover may fail duing a backfire or when exhaust heat burns or corrodes it, and this can cause debris to enter the exhaust valve.
Shoe. |
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This thread, so far...
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